Modulator Amplifier (V1574E)

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

TTL AC control with Triac (CB13462E)
We found this circuit in an American documentation from 1977. In it we have the way to use an...
Microphone Preamplifier (CB10228E)
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
Planar silicon light sensor (CB8323E)
This circuit, which uses a planar silicon sensor, is from a 1964 Electronic Design. The component...