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.

Binary Random Number Generator (CB12196E)
This circuit is from an English publication from 1978. It generates random binary numbers when we...
Telephone Interface for Amplifier (CB12101E)
We found this circuit in a Poptronics of February 2000. We can do its assembly using 4 1N4001...
435 MHz amplifier (CB8403E)
Found in American documentation from the 90s, this circuit uses a GASFET of the time. The circuit is...