Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan’s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance. I’ve seen lots of designs through the years, some of them were so simple, some of them were powerful, some of them were hard to build etc. Read the rest of this entry »

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Here is a small project about FM receiver that you can built with a little cost. The schematic below

This is a very simple kind of receiver. The dificult point is to get the inductor coil, i think there a no electronic store that sell this coil. so you must make it by yourself

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Below i have finished develop a mini fm transmitter that work fine at frequency 88 – 108 MHz. This is a simple FM Transmitter that can be used in a small city (2-4 Km). Here is the schematics

mini fm transmitter

if you could not understand please feel free to comment here

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A small FM Voice Transmitter for Band 2 VHF

This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The coil is four turns of 18swg wire wound around a quarter inch former. The aerial tap is about one and a half turns from the supply end. Audio sensitivity is very good when used with an ECM type microphone insert.

Circuit : David Sayles

email:anc@mitedu.freeserve.co.uk

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