Transistor voltmeter (CB20582E)

This is a voltmeter with high input resistance. The transistor is germanium. We found it in an English publication from the 60s.

Flip-Flop Using NOR Gates (CB142)
The R-S flip-flop shown here uses two NOR gates and is set and reset by positive pulses applied to...
Balanced Modulator (CB4191E)
This circuit is intended for SSB transmission by generating two sideband signals with the carrier...
Triac Three Phase Motor Control (CB4261E)
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...