Found in Radio Electronics from the 90's, this circuit can be implemented with other operational amplifiers. The power supply is symmetrical.
The diode of this circuit must have current according to the motor. What it does is apply motor...
This circuit is used to connect an additional capacitor to a tuned circuit of a VFO. The circuit...
This circuit was found in a 1987 edition of the United States' Hands-On Electronics magazine. The...