This automotive circuit was obtained from an 80's schematic from the integrated circuit factory itself. The voltage regulator is still common, but the operational amplifier is of the time.
This circuit is a variation of the common grid dip meter, having been found in a 1975 publication on FETs....
This small FM transmitter has a sensitive modulating stage and is therefore suitable for listening...
In its first version this article was written in Portuguese for a Brazilian magazine and...