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Electronics Schematics - R

Build your own cable radar: 10/01/98 Electronic Design - Ideas for Design / A time domain reflectometer (TDR) is a handy but rather expensive instrument, and isn’t commonly found on every bench. I used to rent them, but after having paid large bills for several years, I decided to make my own.

Digital Radar Speedometer: 

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.

Radar Detector #2: 

Radar Detector #3: "Radio-Electronics" Magazine, Jul,86 issue (C) Copyright Gernsback Publications, Inc.,1986

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