Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to 15 V. The operational amplifier is from the era and can be replaced by modern equivalents.
This circuit appears in other articles and suggestions for circuits in this section from other...
This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The...
Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power...