Schematic Circuits

Mini FM Transmitter


This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM radio. It has a range of up to 1/4-mile (400 meters) or more, depending on the line-of-sight, obstructions by large buildings, etc. It is great for room monitoring, baby listening, nature research, etc.

L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4-inch diamter form, such as a pencil.

C4 is a small, screw-adjustable, trimmer capacitor.

Set your FM radio for a clear, black space in the lower end of the band (88MHz). Then, with a non-metallic/non-conductive trimmer tool, adjust this capacitor for the clearest reception. A little experimenting and patience may be in order.

Most of the parts values are not critical, so you can try adjusting them to see what happens.
If you decide to substitute transistors with something similar you already have, it maybe necessary adjust the collector voltage of Q1 by changing the value of R2 or R3 (because you change transistors, it changes this bias on the base of Q1). It should be about 1/2 the supply voltage (about 4 or 5v).









Mini FM transmitter schematic




Parts List
R1=10K               C1,C2 = 0.1uF     Q1,Q2 = 2N3904        
R2=1M                C3 = 0.01uF        L1 = 0.1uH
R3 = 100K           C4 = 4-40pF
R5 = 100 ohm      C5 = 4.7pF
R7 = 1K



The default for the capacitors type is ceramic, preferably the npo 1% (low noise) type or equivalent. But-basically nothing critical here. Use any capacitor you have laying around, but NO electrolytic or tantalum caps. Only if you intend to use this circuit outside the home you may want to select more temperature stable capacitors.


To find the signal on your receiver, make sure there is a signal coming into the microphone, otherwise the circuit won't work. I use an old mechanical alarm clock (you know, with those two large bells on it). I put-this clock by the microphone which picks up the loud tick-tock. I'm sure you get the idea... Or you can just lightly tap the

Keywords : Shematic, Circuits, FM, Mini, Audio, Amplifier, Electronic, Amplificator
Writer : delon  |
17 Jan 2007 Wed   
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