This circuit was found in a Japanese publication from the 1960s. It uses germanium transistors and is powered by a voltage of 22.5 V. The circuit includes the erasure oscillator.
Based on common components, this circuit was found in an English publication. The circuit is...
This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply...
In relation to the previous circuit (CB18493E) this spy has an extra transistor, which can be a...