This timer has a divider programmed by BCD switches. The circuit is from a Radio Electronics magazine from February 1989.
In the figure we have the basic configuration for interfacing TTL logic with CMOS logic. The...
We found this circuit in a 1979 French publication, but it can still be assembled today with...
This circuit can be used on audio, video, or data links to receive modulated infrared signals. The gain is...