I was looking around the internets the other day and stumbled across this little gem. 100 Oscillators! Zoiks. As it turns out, I had already been toying with building a drone synth of some kind. Just was not sure what I wanted.
I had bought some Arduino mini pros and a FTDI programmer for stupid cheap. They work fine, but the inspiration was low this sounded more interesting. From the sound of the video, it was an elusive circuit I had played with years ago.
The Negistor Oscillator!
The first time I had seen it was on a website that belonged to moosapotmus. The circuit seems simple enough.
Since I was building mostly stompboxes, I was striving for a 9v supply. This was downright impossible to get to work except for a handful of 2n2222a npns that were in metal cans.
The circuit on Look Mum No Computer is a little different. There is an LED between the collector and ground.
Giving it a second shot, it was just as messed up. Bringing up the supply voltage works to a degree. I seemed to get similar results as here. One type of 2N2222 would work while another 2n3904 might not really work at all. Sometimes they would only oscillate over a small range.
I picked out 5 transistors that seemed to play well enough together to piece together this.