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.
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
This circuit was found in an old European documentation. When R2 is cut off the circuit triggers...
This circuit for the positive front of a rectangular signal was found in an old documentation, but applies...