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.
Capacitance to voltage converter (CB6075E) This Texas Instruments circuit can be used on a...
This circuit was obtained from an American 80's documentation. The transistors can be 2N2222 and...
This circuit is a small FM transmitter, capable of carrying its signals over short distances...