This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
The current of this source is 200 mA at the most, and the output depends on the zener that may...
Found in a 1970 documentation, this SCR bistable can be implemented with modern equivalent SCRs. Observe...
This circuit produces sounds that depend on the measured voltage and that can be compared with a...