This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has an amplification stage for the relay. The relay is rated at 12 V.
The basis of this circuit is the HA2400 released at the time. The circuit is from a Radio...
This type of circuit is traditional and has been published several times in different forms and...
This variable gain circuit for analog video signals was found in a 90s Linear Technology...