Wattmeter (T1351E)

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

Positive-Triggered Half Monostable (CB121E)
One 40108 Schmitt inverter or one 4093 gate can be used as a half monostable to be triggered by...
Audio Signal Generator TA7063P (CB1373E)
This signal generator found in Japanese documentation of 1973 uses an unusual integrated circuit...
Current regulator with operational (CB21113E)
This is the basic configuration of an operational amplifier as a current regulator. We found it in...