This circuit consists of two current mirrors, emitter follower, SCR, an inverter and a class B emitter follower output stage, except the current mirrors the rest are used to exploit the hysterical property of SCR, the current sources are used to charge the cap to more or less linear ramp...
The problem I had with this circuit is that, the current mirrors are not symmetrical, I mean the discharge current mirror is drawing a large current compared to the other one. I tried to make the reference resistor of the discharge larger but resulted in non linear ramp.....
