This is one of the many modulated siren versions that can be found on our website. We found it in a Hands On Electronics from the 90s.
This decoder circuit 3 of 8 was found in a publication for PCs from 1992. The circuits are TTL and...
This circuit, found in a 1980 publication, limits the amplitude of the output signal to a value...
This circuit allows you to couple a TTL circuit output to the input of a CMOS circuit. The base is a...