Address decoder using the 74LS138 (CB20537E)

This decoder circuit 3 of 8 was found in a publication for PCs from 1992. The circuits are TTL and must be powered with 5 V.

Nicad charger (CB9543E)
Found in National Semiconductor documentation from the 90s, this circuit makes use of components from...
Capacitance Meter (CB25988E)
This circuit was originally designed to measure capacitance with an ICL7107 but can be used with...
Receiver TDA7000 (CB15974E)
The TDA7000 is a Philips integrated circuit that contains a complete FM receiver with the need for...