This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
Figure 1 shows a circuit than can be used as time stage in timers, and other applications....
This 600-ohm line driver was found in a 1980s documentation. The integrated circuit used is not...
This logic circuit can indicate both TTL (5 V) and CMOS (5 to 12 V) output levels, operating with...