This circuit protects the speaker from dangerous direct currents that could damage it. The circuit is from an Electronics Experimenter Handbook 1993 edition.
To fit the integrated circuit under test, we used an 8-pin DIL socket. Observe the fitting...
This receiver can be used to receive signals from the previous circuit transmitter. The circuit is...
This is the 1968 MR480 commercial cassette recorder circuit. The circuit was fully transistorized and...