Modulator Amplifier (V1574E)

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

Square Wave Generator (CB12810E)
This circuit was obtained in an old Argentine publication, using germanium transistors and...
Milliohmmeter (CB25813E)
This very low resistance meter was found in the February 1995 issue of Electronics Now magazine. The...
White noise generator (CB22010E)
Using a CA3130 operational amplifier, this circuit was found in an English publication from 1977....