Insect or frog sound generator with 3 transistors and a small solar panel between 1.5 V and 3 or 4 V HD

Please read the description/textbox first for all necessary info. This textbox/description relates to 2 video’s: Video 1: the “wave-shaper” circuit that can change sine waves into kind of square waves (kind of? watch the video), made with only 3 (10 cents) transistors, all of them the BC 547 b. General purpose NPN transistors with a HFE (Bèta) of 300 or 250. I cannot give more explanations, all is explained in the video. Works (sine to square wave) between 200 KC and 700 KC, was tested in that frequency band. Surely can probably work on lower frequencies (lower than 200 KC) surely not (!) on higher frequencies (above 700 KC, too much waveform deterioration, was tested, setup is too simple). But feel free and try/experiment (!). LINK is here https://youtu.be/v_SSlqEaH6w Important: much good info about how to use a TL 071 Opamp in a function generator circuit is here (earlier video) https://youtu.be/FXAKKvH9FrE Video 2 (NOW & HERE, 17 August 2022): an oscillator made with three medium power transistors. 2 X the BD 139 NPN Silicon transistor (Hfe/Bèta = say 70-150) and 1 X the BD 140 PNP Silicon transistor (Hfe/Bèta also between 70 and 150). Cx (here 56 N) sets the “insect sound or frog sound” frequency, watch the video for the oscilloscope views how such a strange sound looks like (many small voltage peaks). The 220K or 250 K potentiometer also sets the frequency (band) where it works. The circuit is EXTREMELY SENSITIVE, even on tiny amounts of light (of whatever source: the sun, lamps) it starts to “”beep”. Can be used to repell? I don’t know. The frog sound only when you mask the solar panel to its almost maximum. With a battery: lower the voltage (series resistor) till the oscillator almost not works. That gives the frog sound. The circuit with the solar panel is completely "green" and environmental friendly when used as a "wake up circuit", when the sun starts to shine or light enters the room where you sleep. By masking/unmasking the solar panel you can find the time where the circuit has to wake you up. Takes only a few simple tests and of course also depends on the season. The latter effects (seasonal effects) are in my opinion tiny, given the extremely sensitive effects of this 3 transistor circuit when used with a small (tiny) solar panel of whatever kind, say the ones used in simple garden lamps etc. With that solar panel and without batteries it can serve you forever to wake you up in the morning. 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.