Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

Connecting the Telephone Line to a Sound Equipment (CB16970E)
This adapter circuit was found in a 1990 documentation. It is possible to connect a telephone line...
PLL AM receiver (CB8633E)
This receiver circuit was found in a Hands On Electronics from the 90s. The circuit uses a PLL...
Dual Power Supply with 9 V Battery (CB1344E )
The operational amplifier of this low current source may be any of the JFET type. The output...