memory loss - echoes

The last of the glitchy pt2399 circuits that I sold previously as the seppuku memory loss, eccodrone and fragment.
The pt2399 is designed to be a karaoke reverb chip but this is less an echo and more of a analog noise generator/effect. The delay is in fact a 44000 bit shift register.
The chip has an internal lowpass, shift register, modulator and demodulator current control and  reset function  that can be used as a comparator with gate delay.
The input signal flows through three paths each having a distinctive tonal effect that is chopped up and displaced depending on feedback balance and delay time. The feedback path goes through a lot of resistance which allows for a floating area where it drifts in and out of oscillation but it means that the critical stages of the turn is caught in the far reaches.

There are rotary controls for feedback and feedback path, clock, input and output voltage.
The toggles are for processing/generator modes and led diode clipping/gate.

This is another take on the pt2399. It has a voltage control input for delay time., feedback loop has a clipping/squishing circuit and the delay is set up to allow control of compression and manipulate the samplenhold of the a/d conversion. Does nice rising triangle oscillations that interact with the input. (input velocity x freq)   It is good for extending sustain and playing very slow music. 

exor

This is a noise generator  made of 2 shift registers and 3 exor gates and 2 high frequency oscillators .
At each pulse, data entered into the shift register is moved along sequentially through eight stages.
Stages 678 of each register are made available for patching.
An exor gate has two inputs. It opens only when one is up and the other is down ; at all other times it will lie low
Comparing nodes on the shift register and recirculating creates noise, patterns, and tones.

Instead of isolating the circuit on a board I glued the chips down on there backs and wired the jack directly to there little legs. There wasn't any resistance. The circuit is very open to environmental effects.
The oscillators have two outputs each as well as little ears for alligators and fingertips..
I made little brass inserts for the bakelite knobs and glued the old insert onto the front to mark the exor.