Sine wave oscillator variable freq. between 30 Hertz and 1 KC made with a NE 555 Chip schem/demo

Please read the textbox. A video about a sine wave oscillator, working between 20 Hertz and (say) 1 KC, made with a NE 555 timer chip, using the triangle wave output of the 555, coming out of pin 6 of the 555.

After that the signal goes to the gate of a FET (the BF 256 A, N-FET) and a 3 pole audio filter. After that (due to loss in the 3 pole filter) the signal is amplified by a 1 transistor stage, made with the BC 547 b, NPN Silicon transistor with a Hfe/current amplification of 250 (tested).

More info at the end of this description and links to YT video's about “working on the audio syntheziser” (VLOGs and schematics).

Video 1 to 6, all of the experiments. Not everything in this series of video’s could be or is relevant or interesting, by the way (!). See for yourself.

Important is this (old/older/first) video of 4 January 2022

https://youtu.be/Zt0widtCGRU

That is a kind of “key” video where it is all about.

The other videos are experimental developments to get to a good working audio synthesizer. Still working on it further.

The sine waveform in this schematic (16 jan. 2022) is pure above (say) 40 Hertz and higher, up to (sure) 1 KC. Schematic and demo, everything is told.

When you want to go to higher sine wave frequencies the 3 pole filter in the schematic must be changed. For a first idea/experiment: change the 220 N capacitors in the filter to 10 N (=0.01 uF) capacitors.

In that case the filter can work on higher frequencies, but of course with these small filter capacitors (10 N) it will not work any longer on the lower frequencies, say in the 30 Hertz to 1 KC (audio) band (!).

Amplitude loss can be expected for sure. That is logical, given the radio and (audio) filter theory.

But there are always “workable” margins (apart from calculated filters) when you do experiments with this electronic setup. Test, try, learn, take conclusions for yourself.

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 16 January 2022.

Earlier video’s (it is about this kind of “project”), not everything is/could be very interesting, this sine wave oscillator of 16 Januari 2022 video 7 stands “by itself” as a separate schematic/demo.

The first one: https://youtu.be/KisdQ0mednI
Video 1 https://youtu.be/Zt0widtCGRU
Video 2 https://youtu.be/Ud2WjJGgaHE
Video 3 https://youtu.be/atfLEFhQ49E
Video 4 https://youtu.be/rxyXFnYJTVI
Video 5 https://youtu.be/cL4qDn4STeU
Video 6 https://youtu.be/fuELrKxEe5g