Wattmeter (T1351E)

This circuit is from a February 1949 Radio Electronics magazine. The circuit uses 3 tubes and includes the power supply.

Constant Current Source (CB6625E)
This two-transistor constant current source is from a 1968 documentation. Modern equivalent...
50 kHz Fiber Optic Transmitter (CB13533E)
This circuit was obtained in a 1977 technical documentation. The PUT admits equivalent and the...
Digital Inverter (CB16824E)
We found this circuit in a 1997 documentation. Its purpose is to turn a load on or off using...