Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Two-stage RC amplifier 1 (CB7466E)
This two-stage amplifier circuit with RC coupling was obtained in a 1977 Radio Handbook. The...
Phase Inverter Using One Transistor (MSB024E)
This circuit produces two signals with inverted phases. One is taken for the emitter of Q1 and the...
High Sensitivity Darlington Photo Relay (CB14638E)
The circuit presented was suggested by a Texas Instruments optoelectronics manual. The voltage...