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.

Variable Source (CB18169E)
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
6 W Amplifier TDA2613 (CB15725E)
The amplifier presented is ideal for use in small monophonic sound systems, radios or televisions powered...
Remote volume control (CB23927E)
This wired control circuit serves both volume and balance between channels. We found it in Radio...