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 obtained from an American publication of the 80's. The integrated circuit is of the...
This circuit is from 1992 documentation. In it we have the way to implement a Baxandall control using...
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...