PT2399 oscillator

[earthtonesaudio]

I added a NPN transistor to the input of one of the PT2399's amplifiers to make a current-differential amp (Norton amp) and used it to build an equivalent to the free-running staircase generator circuit from the LM3900 datasheet.  Note that the delay line of the PT2399 is still available for whatever purpose.  One fun thing is to make the oscillator run at audio frequencies and then run it through the delay with feedback.  A delay with a built-in monophonic synth!   



That said, this is just a work in progress.  On the breadboard, parasitic capacitance makes it difficult to control the LFO speed with the PT's clock.  Perhaps buffering the clock signal would help, but I haven't tried it yet.

[slacker]

Crazy, I approve