Modulator Amplifier (V1574E)

This circuit is from a 1938 tube manual. Transformers are the critical components. Component values are given.

Touch Switch 741 (CB15617E)
This circuit is based on the bistable configuration, but with the difference that the values of...
3 decades generator 15 Hz to 15 kHz (CB9195E)
This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741...
VHF and UHF Oscillator (CB13089E)
The configuration shown in the figure is one of the most traditional when it is desired to produce...