Posts Tagged ‘RF-Receiver’

A BIPOLAR REGENERATIVE RECEIVER

Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently. The major concern is the low input impedance of the detector-amplifier bipolar stage. Nevertheless, it can be easily compensated with positive feedback or regeneration. A sufficient amount of regeneration can make tuning astonishingly sharp. Another concern is the quality of the detected audio. This, to my knowledge, is subjective. The quality of sound coming out from an earphone can be rated good or fair by two different people. I would suggest that you decide by yourself. So, come on and try the following schematic for the 530 kHz to 1650 kHz AM Broadcasting Band.

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Read More Source:Circuit : Ramon Vargas – Lima, Peru.

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

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A Simple-To-Build Superhet Receiver

This idea presents a simple circuit for a superhet radio receiver that can be built up in sections, with each section tested before assembly. The receiver circuitry as presented here can be built for less than $50.

Don’t be misled—even though the set has some pretty obvious limitations as presented, it’s still capable of worldwide reception when connected to a few meters of wire as an antenna. When constructing a superhet receiver needing just one coil/tuning-capacitor combination, there’s the obvious advantage that only one simple coil needs to be made. It also makes the receiver very easy to experiment with by changing the coil dimensions, etc.

Read More Source:

http://electronicdesign.com/Articles/Index.cfm?ArticleID=4378

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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 The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.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 The ZN414 IC, has now been replaced by the MK484.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

Thank you.

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