Synth project: slow voltage changing oscillator useful for very low beats, schematic & demo



Published
Please read the textbox. This video is a part of the video’s about the audio synthesizer. It was made earlier, but showed later.

The video shows a kind of overall usable oscillator that changes its voltage very (very!) slowly; watch the oscilloscope views. Reason: the high value capacitors in the (say) 1 uF or 10 uF or even higher capacitance range (R-C time effect). Changing the value of the 2 capacitors makes the frequency higher (lower value, say 1 uF) or lower (say 10-33 uF or so). Of course always solder them in the mimicked way to used them as quasi non polar caps.

That can be useful for all kinds of electronic purposes: measuring devices, vibrato oscillators, everywhere where a slow build-up and build-off of a voltage is necessary in an electronic circuit.

The actual frequency (slow up-down of the voltage) is set by the values of the 2 time dependent capacitors in the circuit, and thus other times can be set by changing them to other values.

They are “mimicked” non polar capacitors of a high value (say in the 5 uF-22 uF range) by soldering two electrolytic capacitors together in the way as it is showed in the circuit, so (+) to (+), so that we have a mimicked non polar capacitor, with two minuses (-).

You can also use non polar capacitors in the 1 uF range, no problem, that will also work, even better (more stable regarding temp and long time effects). In this circuit I used two 10 uF electrolytics, so back to back soldered each capacitor was quasi non polar 5 uF (10/2).

All the video’s about the synthesizer project are, by the way, here:
The more or less complete bunch of all the relevant video’s regarding making such an audio synthesizer is here:

https://youtu.be/KisdQ0mednI Elementary audio synthesizer: works & used, originally from 2014, schematics & more links in the description at this video.

https://youtu.be/Zt0widtCGRU 4 January 2022. Crazy sound(s) box, it shows the basics of making peculiar sounds, works & used.

https://youtu.be/Ud2WjJGgaHE 5 January 2022. Not used here, but very usable. Works and was used. Easy Square wave oscillator/generator for audio and higher frequencies with the TL 071 FET Opamp and only a few components.

https://youtu.be/rxyXFnYJTVI 8 january 2022. Not used here but very usable say as a measuring device or for whatever electronic use, a square wave and triangle wave oscillator made with a NE 555 Chip (20 Hz-20 KC).

https://youtu.be/IOcN-yuc68s . Works & was used. A very basic organ circuit via two 2 transistor A stabile multivibrators (read: square wave oscillators). A good basic approach for many audio experiments, tests, etc.

https://youtu.be/77L5scpjoQo A one transistor sine wave oscillator (can be combined with the synth. project, works & was used). Useful everywhere where you want/need a proper sine wave for whatever purpose: test, measurements, etc.

https://youtu.be/QwADz9-ozhM How to change square waves into sine waves. A 3 pole filter that works, was used, and will be used in the future. It shows the very basics about how to do that, with 3 principal setups (470N-100N-50N-10N & resistors of 1 K or 10 K).

My You Tube channel trailer is here: https://youtu.be/xbgQ8T3oqh4 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.
https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=Ko+Tilman

I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. 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 27 January 2022.
Category
Audio
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