Wattmeter (T1351E)

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

Touch Volume Control (CB24362E)
We found this circuit in a Radio Electronics magazine from January 1975. The transistors are...
Hall Sensor Metal Detector (CB15794E)
This circuit is from a 2001 Poptronics. The magazine no longer exists, but the components used are...
Oscillator with stable start and stop (CB8918E)
Found on an Elektor from the 90s, this TTL circuit generates a predetermined number of pulses with a...