Lead Acid Battery Charger (CB26301E)

This power charger was found in a 1990s issue of Popular Electronics. Integrated circuits must be equipped with a heat sink.

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555 Tester (CB20887E)
To fit the integrated circuit under test, we used an 8-pin DIL socket. Observe the fitting...
Receiver via power grid (CB5068E)
This receiver can be used to receive signals from the previous circuit transmitter. The circuit is...
Cassette Recorder MR480 (CB18496E)
This is the 1968 MR480 commercial cassette recorder circuit. The circuit was fully transistorized and...