This circuit was found in the February 1992 issue of Radio Electronics magazine. The circuit provides stepped frequencies as shown in the diagram.
This circuit is from a 1968 Electronic Design. The characteristics of the output transformer are not...
This circuit uses a GE optical coupler. Equivalents can be tried. The circuit is from the GE...
This circuit uses an 80's operational amplifier. The circuit is from an old RCA manual and can be...