Taking an example of a Raytheon operative as uncommon today, the circuit applies to other operational amplifiers. The formulas are given next to the diagram.
With this circuit, we can have a remote frequency control of a tuned circuit. Lx is the coil of...
This circuit for incandescent lamps was found in the February 1972 Radio Electronics magazine. The triac is...
Suggested by an old Popular Electronics, this circuit is based on an uncommon integrated today,...