The purpose of this 1965 Radio Electronics circuit is to observe cycloid waveforms on a standard oscilloscope. The frequency range depends on the switch settings.
In the figure we have a wireless wiretapping circuit for the frequency range determined by L1. For FM...
This voltage follower or amplifier with unit gain uses an unusual operational amplifier nowadays. The...
Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The...