PC address decoder (CB20536E)

This TTL decoder circuit for PC ports was found in a document from 1992. The power supply can be PC's own circuit.

Bistable CMOS (CB15923E)
This Set-Reset (RS) flip-flop uses an integrated 4001 or 4011 in addition to some external...
Basic Comparator LM339 (CB15186E)
This is the basic configuration of the LM339 as a comparator, requiring a 3k (3k3) pull-up...
Piezoelectric Transducer Manual Siren (CB15858E)
This circuit is a siren with manual modulation that, instead of exciting a speaker, excites...