This 1980s documentation circuit uses a 741 in a different high-speed comparator configuration. The feed must be symmetrical. The diode is general-purpose.
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...