Simple (too?) 3 transistor 50 Hertz or 60 Hz square wave oscillator demo and schematic (Astab muvib)

Please read the description first. A very simple/basic way of making a square wave oscillator for 50 Hertz or 60 Hertz.
Duty cycle can be set via the 2 potentiometers of 470 K. The stability is given by the temperature (say home-temp = 20 degrees Celsius) and the stability of the supply voltage (exact 12 Volt, via a stabilizer, say a 7812 in the positive supply lead). And the quality of the components, especially the used capacitors. Ceramic capacitors are much more sensitive to heat/warmth. Their capacitance value easily changes when they get warm or hot.
Its stability could be good enough, but not for all electronic applications (...).
I think a 555 Chip can give (will give) a better frequency stability, anyway, it is a useful circuit, also usable for other frequencies, with other values of capacitors (try e.g. 100 N = 0,1 uF or 10 N=0,01 uF).
I used here NPN Silicon transistors (BJT) with type number BC 549 C. The circuit is so universal that it also can/will work with a BC 547 b, in fact any NPN transistor with a Hfe (Bèta/current amplification) of 150 or higher.
Test,try, experiment. It is always fun!
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Type there (in the looking glass = search option on UA-cam) the keywords that you like (e.g. radio/audio/amplifiers/test/filter/) in the “looking glass” = search function” and give “enter”. Via that you can find specific video’s (under the say 1500 published).
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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/s....
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. Upload 22 June 2024.

[@ornithopterindia]

👍Thank you sir.

[@garygranato9164]

you made a synth :)

[@t1d100]

👍👍👍