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.

Symmetrical Power Source with Voltage Doubler (CB4633E)
This circuit consists of a 10 + 10 V symmetrical source that operates from a single 5V input. It is...
Gate dip meter (CB9709E)
This circuit covers the bands from 1.8 to 150 MHz, with plug-in coils whose characteristics are...
20W Transistor Amplifie (CB1368E )
In this project, from a Japanese magazine of 1973, only one channel of a stereo amplifier of 20 W...