Microammeter (T465E)

Found in a 1948 MIT documentation, this circuit uses a 0 to 100 uA microammeter as an indicator. The power supply is 150 V.

Unregulated Power Source of 6 and 9 V - (CB1166E)
This simple unregulated power supply with half-wave rectification is for small appliances that do...
Photo relay (CB22295E)
Found in an American book from the 1960s, this circuit uses a photoelectric cell of the time as a...
Integrated Amplifier TBA820L (CB19422E)
In the publication in which we found this circuit, it is suggested for applications in clandestine...