Simple audio synthesizer: how to make it part 4: demo of the FET decoupling stage schematic

Part 4 of the audio synthesizer project. Please read the textbox/description first.

For a better overview and what this is all about (making a simple audio synthesizer) watch the earlier video’s.

They are here:
Video 1 https://youtu.be/Zt0widtCGRU
Video 2 https://youtu.be/Ud2WjJGgaHE
Video 3 https://youtu.be/atfLEFhQ49E

In this video (vid 4) I show how a FET (Field effect transistor, be it a BF 245 b, a,b,c (obsolete) or a BF 256 b FET (not obsolete) can handle a quite complicated job: changing a high impedance source out of the 555 Chip (pin 6 and else) into low impedance source (say : output), to which (say) simple audio amplifiers can be connected with input impedances in the 1 K to 10 K range.

Via a coupling capacitor etc. Many circuits of such a 1 Silicon transistor amplifier (say a BC 547 B, audio, 20 Hz - 20 KC) amplifying 100-200 x are on my YT Channel.

Anyway: it is about a project to make a simple audio synthesizer & video 4 in the project. Please read the textbox. An update and only a VLOG, telling something about the development of this simple audio synthesizer with a few (3 or more) Muvibs and a sine wave generator that has to make the “base tones” in the audio range.

Good first video (31 december 2021, showing the principles and the parameters) is here https://youtu.be/KisdQ0mednI

Good earlier video (how to make a basic synthesizer with 3 Astabile Muvibs, generating square waves) is here https://youtu.be/Zt0widtCGRU

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.

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 8 January 2022.
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