SUPER SIMPLE OSCILLATOR
SUPER SIMPLE DIY OSCILLATOR YOU CAN MAKE IN 10 MINUTES. SUPER CHEAP AND EASY.
So this is strange because your using a transistor in a way it isnt intended for, REVERSE AVALANCHE MODE is the name, OSCILLATING is its game!
This is based off a circuit i used in this video, which is making a light theremin out of a red bull can, no solder either!
for info check this video! and below is the SCHEM and STRIPBOARD LAYOUT.
***MAKE SURE YOU CUT OFF THE CENTRE LEG OF THE TRANSISTOR OR IT WONT WORK*
TRY different Transistors. check out this great link (CLICK) on reverse avalanche. he talks about different transistors he has tried, the one that caught my eye and i may have to try is SS9018 as it only needs 8 volts insteat of the aboves 12 volts!!! so im going to give this a go also.
Play around with capacitor values. the larger the capacitor the slower it will oscillate.. and the higher.... it will be all high pitched! in the red bull can video! i used a 220nf capacitor! so it was a high synth. like a theremin. But in the video above i wanted it to be low and angry so i put a 10uf on it.
Below is what 100 of these circuits put together sound like. there are 6 to every tone "filter" knob and volume. all in all its rather chaotic, i need to add on and off switches to all of the oscillators because its tough to tune, even if you isolate it to only 6 oscillators going at once.
check out paul bergels triple skulls! the oscillators built into skull jars! He took the fact that different capacitor values make different ranges! so each are assigned a different note range :-
bass skull: 100uF capacitor
tenor skull: 33uF capacitor
alto skull: 10uF capacitor
the smaller the capacitor value the quicker it oscillates, meaning the higher the notes are!