Modulator Amplifier (V1574E)

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

OR Function with the LM3900 (CB4507E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
Proximity Sensor (CB4899E)
This circuit was found in a 1980s English publication, but can still be easily assembled by the...
High Impedance Probe (CB6454E)
Originally suggested by Electronic Design in a 1965 documentation for use with oscilloscopes, this probe has...