Posts Tagged ‘RF-Radio Frequency’

4.5-10Mhz Superheterodyne RCVR

Cell phones aren’t the only devices to benefit from ever- smaller and more highly integrated communications-IC technology. The simple, three-IC superheterodyne radio in Figure 1 can receive stations in the 4.5- to 10-MHz range from around the world with only a 10-ft antenna. A superheterodyne radio works by mixing the incoming RF signal with a local-oscillator (LO) signal to produce an IF. We don’t need to spell it out. The circuit then filters, amplifies, and diode-detects the IF signal to reproduce the audio signal contained in the RF input.

Read More Source:http://www.edn.com/archives/1996/080196/16di6.htm
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Wideband VHF/UHF/SHF 22dB PREAMP by MAR-6

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
Read More : http://www.electronics-lab.com/projects/misc/004/

ZN414-MK484 Portable AM Receiver

An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.

Designed around the popular ZN414 IC this receiver covers the medium wave band band from approximately 550 to 1600 KHz with the values shown. The coil and tuning capacitor may be taken from an old MW radio to save time. The ZN414 IC, has now been replaced by the MK484. The integrated circuit is a 3 pin, tuned radio frequency circuit, and incorporates several RF stages, automatic gain control and an AM detector. It is easily overloaded and the operating voltage of th IC is somewhat critical to achieve good results.

Read More Source:Circuit : Andy Collinson

http://www.mitedu.freeserve.co.uk/Circuits/rf/ZN414.htm

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