CyberCircuit by PTM

Back to the Archive


Economy radar detector

This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching threshold of the second op-amp; normally it is adjusted so that the circuit barely triggers on background noise, then it's backed off a bit. The response of the circuit may be tuned by adjusting the length of the leads on C1. For typical road-radar systems, the input capacitor's leads should be about 0.5 to 0.6 inches long.

Source: "Radio-Electronics" Magazine, Jul,86 issue (C) Copyright Gernsback Publications, Inc., 1986


Home |  Product Info  |  Ordering Info  |  Contact Us  |  Get a Demo

 Circuits in CyberCircuit  |   Circuits in CyberCircuit Plus  |  Circuit du Jour  |  Circuit Archive


Copyright (c) 1995-1998 by PTM