This circuit is from a high voltage tube source. It does not include the filament voltage that must be supplied by a separate transformer.
This circuit implements a 3-way control, with outputs in A, B and C, using CMOS integrated...
This 1985 circuit takes advantage of an old cassette recorder to answer and record phone calls,...
This circuit operates at the frequency of a small transmitter up to 27 MHz, triggering a relay from...