This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA documentation. The transistors are from that time.
This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and...
We found this circuit in a 1967 Electronic design. However, it can be easily implemented even...
This circuit for measuring bridges was found in American documentation from the 60's. Transistors are...