This two-microphone amplifier was found in a April 1961 Radio Electronics Magazine. The circuit is powered by battery and has a 600-ohm line output.
This circuit makes use of comparators and common operational amplifiers, having been found in...
Standing wave ratio or SWR is an important measure of whether all power from a transmitter is being...
A configuration using three of the four voltage comparators on the LM339 is shown in the figure and...