This circuit doubles the frequency of signals from 10 to 50 MHz. We found it in a 1969 Electronic Design. The components are from the period.
This circuit is from a Japanese publication in 1967. The circuit uses a Geiger-Muller valve and...
This classic windscreen wiper interval setup was found in American documentation from the 90s. The...
This circuit is from old documentation and can be assembled with 2N2646 for the unijunction and...