This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
This circuit for shunt motors was found in an American 1980s documentation. The SCR should be rated...
We have in the figure a traditional amplifier configuration with operational amplifier. The source...
This circuit produces a square wave signal with the frequency determinated by R1 and C1. The upper limit...