The purpose of this 1967 Philips circuit is to produce a rectangular signal from a sharp pulse. The circuit makes use of an unusual component today as a base.
In the figure we have an IF amplifier step using a MOSFET. The circuit was found in a 1980s...
With the precision given by the crystal this circuit provides signals of several frequencies for the...
Found in a 1980s telecommunications documentation, this balanced modulator circuit uses...