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.

Automotive alarm 555 (CB8958E)
This is one of the many 555 based car alarm circuits that we have on our website. We found it in a...
Precision Voltage to Frequency Converter (CB6106E)
Suggested by the National Semiconductor in 1980s documentation, this circuit uses components from the...
CMOS interface with optical coupler (CB25493E)
The figure shows how to couple two CMOS circuits using an optical coupler to achieve isolation. The...