This converter for WWV time reference station signals was found at Popular Electronics. The 15 MHz signals are now received on a medium wave radio at 1 MHz.
This circuit using only transistors was found in documentation from 1977. The frequency is 4250...
This simple transistor tester was found in a Japanese magazine in 1967. It tests general purpose...
This 50 kHz to 250 W circuit was found in an old RCA documentation. The transformer is a...