We found this cable tester in a Popular Electronics from the 90s. The circuit uses a connector according to the cable to be tested. Adaptations can be made for different types of cables.
This somewhat critical circuit was found in a year 2000 documentation. The frequency depends on...
With this passive circuit it is possible to modulated in amplitude a low intensity RF signal. The...
This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is...