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 uses a Hall sensor in the feedback of signals that produce oscillations. The circuit is...
We found this source in documentation from the 1980s. The power transistor can be the BD137 and...
This circuit was found in a 1967 Electronic Design. FETs are from the time, so modern equivalents can be...