Scale Expander for 12V Meter (CB21330E)

This circuit was found in a QST from the 1990s. The circuit expands the scale of a 10V instrument to measure 20V.

Damped tone generator (CB8842E)
This circuit uses an unusual electromechanical component: a mechanical blade resonator. The...
Transistor Amplifier (CB18859E)
This circuit from a Japanese publication in 1968 uses germanium transistors from the time like the...
Operational power VCO (CB8779E)
Found in a 90s Electronic Design, this circuit can provide a relatively high-power output. The basic...