This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation by triggering a warning light. The operational amplifier is of the time.
This circuit was found in a 90's EDN. The circuit provides two 15 V outputs and one 5 V output...
June 2017 - Mouser Electronics has in stock the new AC Metallized Polypropylene Film Capacitors...
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...