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radiofun232
Приєднався 7 тра 2010
Very good Muvib square wave generator (1968) with constant current source, works from 1 Hz - 1.5 MC
Please read the description first. Circuit (1968) of a very good working square wave oscillator, for the frequency range 1 Hertz to (say) 1.5 MC, perhaps even higher.
Only 1 capacitor does the frequency job here, between (say) 10 uF and 300 pF (or a somewhat smaller value), in combination with a 2 transistor current source, driven by a 500 Ohm potentiometer.
The waveform (squarewave) is very pure, surely up to 1 MC. It gets “rounded” edges on higher frequencies, say above 1.5 MC.
Test, try, experiment, and do/take own experiments/conclusions to study this circuit and see what happens.
Much more info is visible in the showed tables/experimental results. When you can interpret them in terms of value/type of capacitor and the frequency that it can give, and about what I was doing in practice in this regard.
I adapted the 1968 circuit somewhat: using modern NPN Si-transistors (BC 547 b, Hfe = 300) and adding a kind of decoupling circuit paralleled to the (+) and the (-), consisting of a 47 uF capacitor, paralleled with a 330 K (or 470 K) resistor. It works on 12 Volt.
A very easy to make and properly working square wave oscillator, useful for audio and HF experiments. So that 1968 circuit was true.
More things are told in the video, so now no need for elaboration. Thus to get with certain capacitors (Cx in the schematic) to certain squarewave frequencies can be easy.
My You Tube channel trailer is here: ua-cam.com/video/xbgQ8T3oqh4/v-deo.htmlsi=e0WkTyOe8rFkn6Xr
Please note: I am shadow banned and censored by YT/Google when posting comments abou the EU/the situation in Ukraïne/the jabs, etc. It also means that I can no longer insert the link to my channel trailer (Radiofun232 on UA-cam) in the description of my video's, when I upload them. I have to take a separate action to give that link. YT/Google does not want that people get to my Channel Trailer, where critical things are told in the description about the jabs, the war in Ukraïne, the EU measures and its dictatorship etc. Situation 19 Aug. 2024 (and 2 years earlier).
When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there. www.lulu.com/search?adult_aud... I keep all my YT videos constant actual, so the original video’s with the most recent information are always on UA-cam.
Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 19 August 2024.
Only 1 capacitor does the frequency job here, between (say) 10 uF and 300 pF (or a somewhat smaller value), in combination with a 2 transistor current source, driven by a 500 Ohm potentiometer.
The waveform (squarewave) is very pure, surely up to 1 MC. It gets “rounded” edges on higher frequencies, say above 1.5 MC.
Test, try, experiment, and do/take own experiments/conclusions to study this circuit and see what happens.
Much more info is visible in the showed tables/experimental results. When you can interpret them in terms of value/type of capacitor and the frequency that it can give, and about what I was doing in practice in this regard.
I adapted the 1968 circuit somewhat: using modern NPN Si-transistors (BC 547 b, Hfe = 300) and adding a kind of decoupling circuit paralleled to the (+) and the (-), consisting of a 47 uF capacitor, paralleled with a 330 K (or 470 K) resistor. It works on 12 Volt.
A very easy to make and properly working square wave oscillator, useful for audio and HF experiments. So that 1968 circuit was true.
More things are told in the video, so now no need for elaboration. Thus to get with certain capacitors (Cx in the schematic) to certain squarewave frequencies can be easy.
My You Tube channel trailer is here: ua-cam.com/video/xbgQ8T3oqh4/v-deo.htmlsi=e0WkTyOe8rFkn6Xr
Please note: I am shadow banned and censored by YT/Google when posting comments abou the EU/the situation in Ukraïne/the jabs, etc. It also means that I can no longer insert the link to my channel trailer (Radiofun232 on UA-cam) in the description of my video's, when I upload them. I have to take a separate action to give that link. YT/Google does not want that people get to my Channel Trailer, where critical things are told in the description about the jabs, the war in Ukraïne, the EU measures and its dictatorship etc. Situation 19 Aug. 2024 (and 2 years earlier).
When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there. www.lulu.com/search?adult_aud... I keep all my YT videos constant actual, so the original video’s with the most recent information are always on UA-cam.
Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 19 August 2024.
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Відео
Dissolve Silicone kit into Acetone or Thinner to make a moisture repelling paint; does it work?
Переглядів 42814 днів тому
Please read the description first. Update 13 aug. 2024: it works perfect as a moisture repellent, but stays somewhat sticky. Not tested under sunlight. First idea of this video: does it work to make a kind of moisture repellent “laquer” when dissolving (transparent) Silicone kit into (in my case, Netherlands) a fluid called “thinner”, but in other YT video’s (other places in the world) “Acetone...
Simple function generator part 1 of the development with the 74HCT4046 chip from Texas Instruments
Переглядів 33014 днів тому
Please read the description first. I show a circuit under development (!), thus surely not the definite circuit about what I want to make: a very simple (say: “poor mens”) function generator, a square wave oscillator (perhaps with other waveforms, I have to do more experiments) that goes from 30 Hertz to 1.2 MC, with only one chip, the CD74HCT4046 from Texas Instruments. Not showed/ attribution...
Substitute for (say) Shellac: acrylic glass splinters dissolved in thinner to make a useful varnish
Переглядів 33614 днів тому
Please read the description first. A good way (test it) to substitute Shellac and/or make a usable varnish to be used in many applications (it gives an acrylic layer), say in electronic experiments or otherwise. Could be a varnished piece of soft wood, brass nails punched into it, to make & develop electronic circuits in that way. Like I always do, when you have followed my YT Channel. This hom...
Talking about flat radio or oscillator coils, usable for freq. between 600 KC and VHF intro/demo
Переглядів 2,2 тис.14 днів тому
Please read the description first. The subject of this video is only this: talking about making and using flat radio coils. Such a flat radio coil can be used as a radio receiver antenna coil (many 1920’s and 1950’s radio’s are/were using it) or as an oscillator coil. It is a (kind of) braided coil (at least here: 200 KC-800 KC…not always…!) on a form of pertinax or properly varnished wood or w...
NE 5532 Opamp used as sine wave oscillator 151KC-393 KC dem. & schem. + a square to sine wave filter
Переглядів 56421 день тому
Please read the description first. Second application of the (60 Cents) NE 5532 Opamp, now used as sine wave oscillator in the band of 151 KC - 393 KC. First video about that NE5532 Chip (3 Aug. 2024) as square wave oscillator is here ua-cam.com/video/yJRXv29T8v4/v-deo.htmlsi=zXlmjIhScidhpV73 Thus I had, now, to make a “square wave to sine wave” filter at its end-output pin. Such a filter is ve...
Easy & Cheap hobby Square wave oscillator 5 Hz-100 KC made with 2 x a NE 5532 P (schematic & demo)
Переглядів 51621 день тому
Please read the description first. I was very interested in the properties of the NE5532P. It is a double Opamp with a very high frequency range (500 KC or 10 (?) MC). I bought a few of them (made by Texas Instruments, by the way) to do this (first) experiment/test: make a (simple) square wave oscillator with that NE5532 that can get to the highest possible (hobby use) frequency. I found very (...
When Astable Muvibs don't want to oscillate when the voltage is slowly applied. Why? And what to do?
Переглядів 43221 день тому
Please read the description first. In many electronics books/publications no attention is payed to this problem: the AStable Multivibrator does not want to start (=oscillate). The problem happens especially when the supply Voltage slowly comes up (rises) to the necessary voltage to supply the circuit. In that case the Astable Muvib often starts to “hang” and does not want to oscillate. But, whe...
Needle pulse generator or tiny audio beeper on 0,9 to 1,5 volt demo and schematic (textbox/more)
Переглядів 48928 днів тому
Please read the description first. Essential info there. Needle pulse generator for the audio or higher frequency range on 0,9V-1.5 Volt. Application: beeper, morning awaking sound. Use say a few solar cells in a row (each cell gives 0,8 V max by the way, so many (!) of them in series, lying on the window sill, say 6 cells, more info in the textbox) when the sun starts to shine in the morning t...
YX 8018 solar LED driver studied better (3 experiments) + the 5 Volt 300 mW audio amp showed again
Переглядів 452Місяць тому
Please read the description first. Again a video about the YX 8018 Joule-Thief-Chip, often used in Garden lights with 1 LED and 1 rechargeable battery of 1,2 Volt, Ni-Cad or Ni-Mh. Or with a non rechargeable battery of 1.5 Volt. Also again about that audio amplifier, working on 5 Volt, giving 300 mW (schematic). I did 3 experiments: 1. Measuring how much current the YX 8018 takes out of a 1.5 V...
You want to buy an inflatable boat? Buy one made of hypalon! About my DSB one, Germany made in 1984
Переглядів 469Місяць тому
Please read the description first. This video has nothing to do with electronics, it is all about my inflatable boat that I bought in (say) 1984. It was made by a famous German factory, the “DSB” factory. Name “Deutsche Schlauchboot Verein”. Translation: German Inflatable Boat factory”. Their brand name is “DSB”. Here you see the extremely good quality of this factory, a factory that also makes...
2 Transistor emitter coupled Multivibrator, also for HF, Circard 1975 schematic/good properties demo
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Please read the description first. When you are interested in analog or digital circuits out of the 1970’s-1980’s, that were all well tested with indicative values of components (resistors, capacitors, much more) and calculation formula’s, for frequencies, resistors, A/V/R/C effects, go to the “Circard” books of the 1970’s. They are very informative. I used/tested here 1 of these circuits: an A...
A discarded battery drill for 12 V-18 V used in hobby. To make "round" things of wood, plastic, etc.
Переглядів 1,4 тис.Місяць тому
Please read the description first. Not a lathe, only a hobby application, by the way. Better to have "something" instead of "nothing" when you need to make round things, etc. When you mount such an old battery drill (often thrown away, found in the dump or so) in a fierce way on a plate of thick wood or multiplex you can use the fixed horizontal axis of the drill, in all kinds of ways. I did kn...
Audio micr. amplifier for electret capsule with 3 transistors on 3 - 2.2 Volt demo & practice VLOG
Переглядів 498Місяць тому
Please read the description first. The video shows one of the circuits of an audio-pre amplifier that I published in an earlier video on UA-cam, yesterday. I published there (link below) 2 circuits of audio pre-amps, working on 3 Volt (minimum 2.2 Volt) that were made with electret microphone capsules. Links to the schematics and the demo (upload 15 July 2024): ua-cam.com/video/KGWQqOS0raA/v-de...
Microphone amplifier for electret capsules. Made with 3 transistors, works between 3 and 2.2 Volt.
Переглядів 695Місяць тому
Please read the description first. Two circuits (easy to make) are showed as microphone amplifiers for an electret microphone capsule, working on 3 Volt nominal (minimum 2,2 Volt). In both cases made with 3 x a BC 547 b transistor (Hfe 350, NPN-Si). Next video (16 July 2024) is here ua-cam.com/video/Pr39BoCJwDA/v-deo.html I tested the EMY 63 M/P capsule (somewhat noisy) and another electret cap...
The EMY-63M/P Electret microphone capsule going from 20Hz-20 KC and its extremely good properties
Переглядів 562Місяць тому
The EMY-63M/P Electret microphone capsule going from 20Hz-20 KC and its extremely good properties
The YX 8018 LED Booster oscillator Joule Thief Chip tested / conclusions
Переглядів 555Місяць тому
The YX 8018 LED Booster oscillator Joule Thief Chip tested / conclusions
Hearing aid for elderly, looking back to an earlier older circuit, with its good properties
Переглядів 395Місяць тому
Hearing aid for elderly, looking back to an earlier older circuit, with its good properties
Drying my first tobacco leaves (July 2024) but is this a good approach?
Переглядів 440Місяць тому
Drying my first tobacco leaves (July 2024) but is this a good approach?
Very sensitive scale (lower than 1 gram) & movement or earthquake or wind detector via oscillator
Переглядів 2,5 тис.Місяць тому
Very sensitive scale (lower than 1 gram) & movement or earthquake or wind detector via oscillator
Ground loop hum (50 Hz or 60 Hz) in audio amplifiers: what is the cause and how to cure it?
Переглядів 1,1 тис.Місяць тому
Ground loop hum (50 Hz or 60 Hz) in audio amplifiers: what is the cause and how to cure it?
Refurbishing a mini FM radio (1990s-2000s) + in the textbox some info about curing ground loops/hum
Переглядів 293Місяць тому
Refurbishing a mini FM radio (1990s-2000s) in the textbox some info about curing ground loops/hum
Garden Solar Lights: are they throwaway products after 1 year of use? Demo and questions (textbox)
Переглядів 403Місяць тому
Garden Solar Lights: are they throwaway products after 1 year of use? Demo and questions (textbox)
1 transistor sound generator of the 1970's: " wood blocks and claves sound"
Переглядів 745Місяць тому
1 transistor sound generator of the 1970's: " wood blocks and claves sound"
Small talk about the Quality factor (the Q) of radio coils, in theory going from 1 Hertz to .....
Переглядів 1 тис.2 місяці тому
Small talk about the Quality factor (the Q) of radio coils, in theory going from 1 Hertz to .....
Simple (too?) 3 transistor 50 Hertz or 60 Hz square wave oscillator demo and schematic (Astab muvib)
Переглядів 3962 місяці тому
Simple (too?) 3 transistor 50 Hertz or 60 Hz square wave oscillator demo and schematic (Astab muvib)
Astabile Multivibrator with FETS, not ideal, 30 Hz-12 KC schematic and demo, fun for experiments
Переглядів 3972 місяці тому
Astabile Multivibrator with FETS, not ideal, 30 Hz-12 KC schematic and demo, fun for experiments
Keep your 12 Volt Car battery as clean as possible, small talk about leak current with batteries
Переглядів 6772 місяці тому
Keep your 12 Volt Car battery as clean as possible, small talk about leak current with batteries
Too simple 1 transistor bongo drum electronic circuit of the 1970s. A perhaps interesting experiment
Переглядів 5392 місяці тому
Too simple 1 transistor bongo drum electronic circuit of the 1970s. A perhaps interesting experiment
Texas Instruments 74 HCT 4046 AE Chip (VCO/PLL). VLOG & earlier experiments in the description
Переглядів 4272 місяці тому
Texas Instruments 74 HCT 4046 AE Chip (VCO/PLL). VLOG & earlier experiments in the description
I want to make an external 455 khz bfo to listen to ham conversations on the 40 meter band with a cramix 455 khz with 9 vol power that can be tuned. Is there a schematic, sir...
Yes, I understood that. And I sent you 3 schematics/video's, but I think Google/UA-cam deleted my reaction. Thus again: ua-cam.com/video/QH0SvUCIl80/v-deo.htmlsi=I7WRTIp8o6s4dCrL BFO 1 ua-cam.com/video/cCkL_73cKgk/v-deo.htmlsi=Ykt1TSJARhnxOdgT BFO 2: advice: use a BC 557 PNP transistor and ground the mass of the tuning capacitor to earth to prevent hand effect ua-cam.com/video/1mRqhIGD0-I/v-deo.htmlsi=g5zj0HHlad1Diaw0 BFO 3 with a FET Best regards. 26 aug. 2024
Please let me know whether you have received my reaction. 26 aug. 2024.
Diagram bfo 455khz external plisss ser
Perhaps this is what you mean? In the textboxes is showed how you can search for schematics via my channel trailer (the search option). 26 aug. 2024. ua-cam.com/video/QH0SvUCIl80/v-deo.htmlsi=I7WRTIp8o6s4dCrL BFO 1 ua-cam.com/video/cCkL_73cKgk/v-deo.htmlsi=Ykt1TSJARhnxOdgT BFO 2: advice: use a BC 557 PNP transistor and ground the mass of the tuning capacitor to earth to prevent hand effect ua-cam.com/video/1mRqhIGD0-I/v-deo.htmlsi=g5zj0HHlad1Diaw0 BFO 3 with a FET
Please read the comments section for more information. Situation 21 Aug. 2024.
Can this schematic work on 50Hz for driveng FET or igBT
No, I don't think so.
Superb circuit, and just a thought: Should a viewer build this circuit, they can achieve all other specific frequency's by parallel/series that timing cap - any (non-standard) value capacitance can be made this way.
Thanks Michael, the frequency variation is quite good. Though (logical) to cover all the frequencies necessary, perhaps more than (say) 12 positions on the rotary switch are necessary. Anyway, it works nice. Only around (say) 1 MC the waveforms get "rounded". And with typical HF transistors (I tested the BF 199) there is no longer a rounded squarewave but a triangle wave. I had not expected that, so the BC 547 b (not a typical HF transistor, though the BC 547 b can work up to 9 MC) is a kind of good choice. 21 Aug. 2024.
Slow my friend. You want it to dry as slowly as possible without it molding. As long as it retains above 55% humidity it continues to cure and sweeten. If it dries below 55% moisture it won’t cure any further as it lacks the necessary moisture to continue the curing process. I typically wait until the leaves are yellow and get wrinkly appearance before harvesting. They are said to be most ripe at this time.
Thanks for the information.
Love your breadboard, my dad used to build medium wave circuits using a similar board.
Thanks, it is a good way to make radio circuits, it can work good up to 15 MC (tested).
Hallo Ko, zou dit ook te gebruiken zijn om een Middengolf modulator te maken? eventueel buffer en eindtrapje om netjes te moduleren op de oude BuizenRadio... ?
Dat weet ik niet zo goed, Rob. Je kunt de blokgolf uiteraard gebruiken om iets (zendertje of zo) met een toon te moduleren, maar ik denk niet dat je dat bedoelt.
@@radiofun232 Hallo Ko, je antwoord op een manier dat je zou zeggen dit daarvoor beter niet te gebruiken. Wat ik bedoelde is meer een MG zendertje om bijvoorbeeld je MP3 muziek op een oudere buizen ontvanger te weergeven, daar word nog wel eens naar gevraagd hoor. Als ik zo iets zou maken zou het als volgt zijn: oscillator, Buffer/trap, eindtrap, eindtrap gemoduleerd met modulator.(vaak is dat/klinkt dat het mooiste! ) met een paar BCtjes of zo... geen groot vermogen mooi zou ook wel zo'n chinees trafotje kunnen zijn om te moduleren dan.
@@hobbyrob313 OK Rob. Dit is (per definitie) een blokgolfgenerator. Maar rond de 1 MC worden de blokken afgerond en dat ligt aan van alles. Ik heb er vandaag twee echte HF transistoren (BF 199) ingezet en dacht zo een betere blok te krijgen rond 1 MHz, maar het werkte niet. Het werd een driehoeksgolf rond 1 MHz. Om er een zendertje van te maken moet er in alle gevallen een filter achter om een gave sinusgolf te krijgen. Ik weet weinig van het maken van zendertjes in de praktijk, ken uiteraard wel (een beetje) de theorie. Bedankt, groet, Ko. 21 aug. 2024.
@@hobbyrob313 @hobbyrob313 OK Rob. This is (by definition) a square wave generator. But around 1 MC the blocks are rounded off and that depends on all sorts of things. Today I put two real HF transistors (BF 199) in it and thought I would get a better block around 1 MHz, but it didn't work. It became a triangle wave around 1 MHz. To make a transmitter out of it, in all cases a filter must be added to get a nice sine wave. I don't know much about making transmitters in practice, but of course I know (a little) the theory. Thanks, regards, Ko. Aug 21, 2024.
Hoi Rob, ik had je geantwoord maar die antwoorden zijn vandaag (24 aug. 2024) ineens verdwenen. Ik weet niet wie of wat dat heeft gedaan, ik denk Google/YT. Ik word al jaren gecensureerd door Google/YT, enfin. 24 aug. 2024.
😎
Thanks Steve!
The germanium transistors probably had a lower voltage drop between the base and collector as well as base and emitter. Perhaps 0.3 for germanium vs 0.6 for silicone. Good job Ko. 🍻
Good idea Barry, thanks.
Nice stable circuit. It could be used for many purposes. Great information too. Thanks KO!!!
Thanks Richard, it works very nice.
Beautiful circuit. Why I watch this channel, old stuff that works. Today some would program an arduino to make a square wave and learn nothing about circuits.
Thanks & yes, it works very properly, up to (say) 1 MC.
😊👍 great video good information.
Thanks, good to hear that.
Amazing finding! So simple. I'll definitely try with different hfe transistors, maybe higher or non-matched to see what happens.
That is surely a good idea. Such a circuit can be made within 1.5 hour or so. And it works nice.
Tested it today (21 Aug 2024) with typical HF transistors (BF 199), on the highest frequencies around 1 MC I got a triange wave. So the BC 547 b (not a typical HF transistor) is not a bad choice.
good video thank you
You are welcome, Gary, thanks.
The transformer-secondary on my 250-watt soldering-gun is one single turn.
I've tried to find the solvent for silicone sealer, I've tried acetone, white spirit and iso-propel alcohol none have these have worked. Some say naptha but don't know what this is called in Europe.
No, they don't work.
hello radifun232 ..as you may see i commented this video year ago ..time fly ..heh...yes i liked your work and your explanation is good and simple to understand , also yes circuit must be created in "mannhaten" ..style with solderiing klads/points made of PCB bricks ..using real varactor or varicap diodes are far better options because you can set better the stations...also another options is to use inverse connection of NPN small signal transistors like BC types etc ...etc ...if i replicate it i will post video.tnx
OK, thanks. I visited your channel and watched your video, but you don't show the schematic, so it is not possible to see how you made the circuit, anyway. 14 Aug. 2024.
Curing and aging is very difficult for the home grower. Heirloom Organics. Growing Guide GROWING NOTES Growing Tobacco in the Home Garden By E.B. Whitty
Thanks for your info.
I like how work ..but your oscillator is very unusual ..there is Collpits connection on the BASE of transistor then there is Hartley connection with 3p3 on low end of Collpits ,also your oscillator don't have classic feedback loop from base to emitter or emitter to collector ..how oscillate ?
Strange but true. It is used in this FM radio ua-cam.com/video/F5whmoEcbn0/v-deo.html More info there, via the links in the texbox(es). Thanks. 13 Aug. 2024.
Some guesses about the triangle wave issue: - Maybe if the change to triangle wave is gradual, similar to how opamps do with their fixed slew rate (seeing the same slope as you sweep the frequencies) then it could be that the mosfet switch speed is not fast enough at higher frequencies? - Maybe a slightly higher gate/input voltage helps? (A bit brute force approach) - Or maybe lowering some resistances to charge the gate faster?) - If none of the above is correct, then likely some reactive components mess with the circuit in that frequency range, creating or lowering impedance where you don't want it. Mosfets can be tricky. I'm not too knowledgable about the circuit you are making, just my random suggestions. It really depends.
Thanks for your comment, appreciated.
It's a good idea, almost like making the wood into a form of bakerlite. I have seen people using glass and copper foil to make circuits and they look pleasing to the eye. Thumbs 👍
Good audio quality, and clear reception and good documents shown . Thanks pl. Make ckt of 25,31 meter band radio.
It may have a rubbery feeling on the surface. Probably needs 24 hours to set. 👍
Yes Barry, indeed, and that is also the problem. It stays "rubbery" and "sticky". I am absolutely sure that you can use this idea to make a piece of cloth very good moist repellent. But I tested it also with a piece of "hard board" (Dutch name = pressed paper board, useful for everything) and I saw that on that piece of hard board on some pieces the moisture could get somewhat through. But, could be that I have not varnished that piece of hard board enough, so to make it immerse totally. My conclusion: it works very good, but not to isolate electronic circuits, it stays too "sticky". Can attract dust easily + fix/stick that dust on a surface. On the other hand: could be useful for certain outdoor applications. Thanks. I will pin your comment. 15 Aug. 2024.
i have read that you put your resistors into the oven for and hour or two, to completely dry them out and then you paint them with clear lacquer paint. if you dont put them into the oven first then you will possibly trap moisture inside the component. (never done this myself, just read about it)
I was thinking about the same thing. Perhaps dry out the wood in the oven, before applying the paint? I guess it takes a long time (on low temperature) before all the moisture has evaporated from the wood. I sometimes build circuits on corrugated cardboard (golfkarton), using brass pins ('punaises') as solder islands. I guess balsa-wood work well too, but that's a bit expensive.
verry cool 👍
Another thing to try is "Q" dope. Use PVC primer and add polystyrene to it until it's the desired thickness.
Thanks, is there somewhere a "link" how to do that?
😊thumbs 👍
Thanks, hope it was informative.
Seems like a nice way to insulate electronics, I wonder how well it holds up to UV for outdoor projects.
Hi, I saw that my reaction to your comment was deleted by Google/UA-cam. Has to do with shadow banning/censorship, but, absolutely no reason to do that by G/YT. Anyway, thanks for your comment, & yes, that has to be tested. 12 August 2024.
this kind of flat coils are not good for oscillators, but can be good for filters. filters do not need stability. what gets bad stability for generated frequence, is not important for filtering. oscillators are sensible to vibrations, filtering is not
This is a working circuit, but also a demo of the properties of such a coil. When all is made well (fixed windings, etc) the stability is OK. Of course not "crystal stability", but that is logical when you are somewhat acquainted with radio technology. Could be used as antenna coil & as oscillator coil. Everyone must do his/her experiments, to get good results on frequency "x" when working with this setup. 12 Aug. 2024.
@@radiofun232 beautiful work!
Hallo Ko, zo heb ik een 74HC240 gebruikt dat is echt een mooie chip daarvoor! Kan MG en KG doen, kristal er in en gaan!!! misschien ook wat voor jou denk ik wel.
OK Rob, ik ga de datasheet bekijken.
Deeply coool 😊 i love that old school construction style ❤
Pretty cool :) If you want something that achieves higher frequencies there are really cheap modules (around 2$) that use the Si5351, they go from 7Khz to 120-160Mhz and have up to three sepparate chanels. I created a signal generator with those and a bluepill to control it with a little I2C screen and some pushbuttons and work like a charm.
Thanks, good info! But does it need programming via a computer, be it an Arduino or something else?
@@radiofun232 They are controlled via I2C, that's why I paired them with a bluepill, the bluepill is a STM board arduino-like, then with the pushbuttons you can select the exact frequency that you want to generate. If you are interested I have a repository with the schematics and the software.
@@drgusman Thanks, good info. Publish it on your YT Channel so that everyone interested can take profit. Thanks. 11 aug. 2024.
32.768khz, because many times they intended for use on a battery-only time keeping circuit, I guess they are designed to operate well, with very little power (so don't waste your watch battery!). Hence why the large resistors, they only need a tiny amount of current to oscillate properly. I have just finished building a CMOS tester circuit, it uses the inverter / pierce oscillator circuit. What I found works was 10M resistor across the inverter, and 270k in series with the output into the crystal. So again very high value resistors. And you want two capacitors to ground around it (I use 22p). With this oscillator they start up quite fast. For >1Mhz crystals, I instead used 1M and 75R. So much lower values for the Mhz crystals. If you get a variable capacitor you could try replacing it for the 22p in your circuit, and see if you can adjust to get the "correct" 32.768khz
Thanks, good info for everyone. When you don't have published your circuit on YT: do it. Can be useful for everyone. 11 Aug. 2024.
Thanks for interesting video. I bought a coil like this from a radio rally here in England, recently. I think it came from a radio and it is on a compressed cardboard former with windings made from enamelled copper wire. I know some flat coils were made from Litz wire. Perhaps you could talk about Litz wire in a video some time? I would like to learn more about Litz and this type of coil.
This is a video with general info ua-cam.com/video/B6JOURTyCt8/v-deo.htmlsi=ZQ3sgmaS76SXLC4-
@@radiofun232 Thank-you Ko, I will have a look. I have some very old National Brand resonators at 456KCs. If these are of interest to you, I will be happy to send you 2 examples for your experiments and videos. Please let me know if you would like them.
@@acestudioscouk-Ace-G0ACE Hi, I appreciate your offer very much, but I have (too) many components, coils, etc. Thanks!
@@radiofun232 Thanks for the reply and I know the problem! I just thought you might be able to make use of them.
Thinking outside the normal. Love the idea!
Interesting idea 🤔
Thanks Barry. The laquer layer is somewhat thin, but anyway it works.
Hey radiofun232! Longtime fan, I am sorry you are having to deal with fakes and plagiarists. Don't worry, we know you're the original <3 Keep going
Thanks, good to hear that! I am not aware of all these fakes and plagiarists, because I cannot find them or don't know how to find them. So what you say is very valuable to me. Also good to hear that you know the originals (!). 10 Aug. 2024.
Intresting 😊
I'm also interested in sine wave oscillators that operate in RF ranges, like 1.8MHz to 30MHz and even 145MHz.
On my YT Channel there are many oscillators. They go to max. 18 MHz. In the description you can read how you can find them, via the "search option" (looking glass) on my channel tyrailer (Radiofun232 on UA-cam).
@@radiofun232 Is it somehow difficult to make an oscillator for 145 MHz?
@@PaulaBean yes, when it must be stable.
@@radiofun232 Perhaps we can use a crystal?
@@PaulaBean Hello Paula Bean I am not going to communicate further because you did not answer my question + you deny that you have a UA-cam Channel. And: my channel is not a forum and I cannot answer the type of question that you ask ("perhaps we can use a crystal"). Sorry. 9 aug. 2024.
Thanks for explaining electret microphones. I never understood them!
Why was the winding alternated around the spokes? Why not just use a flat coil without flipping the thread up and down?
Both is possible. Alternating has an effect on the stray capacitance.
it is out of boredom
@@Sergiu.antifascist Out of boredom? What do/did you mean?
@@radiofun232 people get bored, and when they are too bored, they begin to wind the coils in different manner
👍 T hank you sir.
I always lean something new when watching your electronic videos. Thanks.
Thankyou for sharing, 👍
Looks like the old 1920's spiders web coils, designed to reduce capacitance. G7VFY
sure!
2:15: no, it's not! :D check again, in TI datasheet there is nothing about IN+ being connected, i think you checked Philips datasheet, where you can find the internal diagram, but you don't zoomed enough, and got ground connection as being a link between positive inputs... :) i was almost sure about that, too, but i zoomed the pdf more, and... eh... age! :)
The TI datasheet only shows one of the two Opamps. There a 2 in the package. What you say could be true, when we look at page 8 in the TI datasheet, the example/schematic there. There is no clear description about this question in the TI datasheet. But I write for a broad public on UA-cam and must be sure that my circuits always work, even when someone uses an older type of this chip. Thanks. 7 aug. 2024.
Very interesting thankyou for sharing 👍
thanks
😎
Thanks Steve, just made a sinewave oscillator with it for HF, 151 KC - 393 KC. Will publish it. 4 Aug 2024.
You can also make the oscillator with only 1 (one) NE 5532. Take the squarewave out via pin 1, opposite to ground (minus), via a capacitor of 470 N. Or without a cap (DC driving).
@@radiofun232 Thanks. Oh I think the NE5532 is a better op-amp then the old uA741 op-amp. Your thoughts?
@@MsFireboy2 Yes, the best property is that the frequency band is higher and there is a somewhat lower noise figure. Though in many cases (also in audio) the 741 can do the job.