This circuit for the 3 to 6 MHz band was found in a 90s Popular Electronics. The components of the network formed by C6 depend on the frequency range to be covered.
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...
This benchtop AC and DC power source was published in the December 1957 Radio Electronics...
The configuration already explored in our Circuit Bench section is from the National...