Modulator Amplifier (V1574E)

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

Driving a 7-Segment Display - 4026 (CB177)
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...
Powerful FM Transmitter (CB17011E)
This transmitter has a few watts of output power, having been found in a 1997 documentation. L1...
Simple RF wattmeter (CB3892E)
This circuit, found in US documentation, can measure the power of transmitters up to 10 W, given...