This circuit can be implemented with either TTL or CMOS logic. The speed depends on the logic used and the circuit can be used with microcontrollers, functioning as a shield.
This circuit was found in an English magazine from 1978, but it is still current, just change the...
This is the circuit of a small commercial amplifier from the 1970s from Philips Argentina. The...
This circuit is from a 1965 General Electric hobby manual. The circuit can be assembled with...