Radar Circuit

Simple 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. ..

This is a very interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered by the circuit the circuit�s fine balance is disturbed and the alarm is triggered. The circuit is very sensitive and can be adjusted to reset itself automatically or to stay triggered till it is reset manually after an alarm...

The relative motion between a satellite and an observer causes a frequency shift known as the Doppler effect. Doppler is well-understood and can be corrected automatically by satellite tracking software...

The microwave diodes are chopper-gated by a multivibrator so the RF signal level can be detected by an audio frequency amplifier...

For designers of radar or sonar echo-ranging systems, an echo imitator can ease development and adjustment chores by generating a controllable pulse that's similar to an incoming echo signal. A decade ago, you'd probably use several 555 timers and their associated RC circuits to design an echo imitator. As Figure 1 shows, today's version uses only two components: linear potentiometer R1 and a small, low-end microcontroller, IC1...