This circuit was found in an Electronic Design from 1964. The components are from that time and can be replaced by equivalents. The modulation ranges from 0.25 to 0.75 of the 20 kHz pulses.
This circuit was found in the October 1989 issue of Radio Electronics magazine. It drives an...
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
This interesting bandpass filter using an operational amplifier 741 has its cutoff frequency...