Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan’s beginning steps. When done right, they prov...
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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Posted in Frequency, Schematics, Sound/Radio Circuits, Transmitter/Receiver | 1 Comment »
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. Read the rest of this entry »
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Posted in Frequency, Transmitter/Receiver | 2 Comments »
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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Posted in Electronics And Projects, Frequency, Schematics, Sound/Radio Circuits, Transmitter/Receiver | 5 Comments »
This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 – 108 Mhz.
click to enlarge the schematic
The circuit uses two 2N3819 FET’s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
L1 4 turns of 18swg air spaced with a 1cm diameter, the tap is one turn up from earth end…
L2 4 turns of 18swg air spaced with 1 cm diameter. The coupling coil is 1 turn interwound from the supply end. Enamel coated wire must be used.
Circuit : Andy Collinson zen22142.zen.co.uk
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Posted in Frequency, Schematics, Sound/Radio Circuits, Transmitter/Receiver | No Comments »
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