This circuit uses a lamp driven by the Hertz loop and measures its brightness with ordinary photovoltaic cells. The circuit is from a Radio Electronics from February 1964.
This circuit is from 1968 documentation. We can assemble it with more modern components such as a...
The frequency ranges that this receiver can tune in depend only on the coils. For medium waves L1...
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...