Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s 73 magazine for radio amateurs. The operational amplifier can be a general-purpose type.
This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be...
The values of the components of this Mullard (Philips) circuit depend on the desired voltages. The...
This amplifier, found in a 1980s documentation, should be powered by a symmetrical source. Modern...