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.

Amplifier for Magnetic Transducer CA3140 (CB11972E)
In the figure we show a widely used configuration for the CA3140. The power of this circuit can be...
2-Transistor MW Portable Radio (CB18846E)
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
Visual dial indicator (CB9300E)
This circuit was obtained in a Popular Electronics of the 90s. The circuit can be assembled with...