This is a simple 27MHz FM-CB receiver circuit built with TCA440 for listening CB ( citizen’s band ) transmissions with FM (frequency modulation). The selection is made with ceramic filters. This 27 ...

A simple fm radio transmitter circuit which covers frequencies from 88 to 108 MHz. It is built with 3 transistors: BC109, BFR91A and BFR96S. It is quite stable and the output power is around 200 mW.

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You want to ensure that anyone with a radio receiver can tune in. Remove resistors Many FM transmitters have a resistor (typically marked with an “R”) to limit the power of the signal.

The FM radio receiver is nothing too special. It’s just an off the shelf receiver that is small enough to fit into a fatter pen. The real trick is to figure out a way to listen to the radio in a ...

Having a NOAA Weather Radio in your home and workplace could save your life. Weather radios are designed to broadcast special frequencies and alert owners of hazards. The weather radio you buy can ...

These radio waves are what you can detect with a simple radio receiver. The best way to do this, as described here, is to get a hold of an FM radio receiver with a good antenna. Your car radio is a ...