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 was found in a 1976 NASA manual, making use of components of the time. The transistor...
The circuit that gave rise to this configuration is from 1978. In the original publication are...
We find this circuit in documentation from the 1980s. The triac and diac are of conventional types...