fm Tags - Circuit Schematic Diagram https://circuitscheme.com/tag/fm Electroni Schematic and PCB Design Sun, 09 Aug 2020 02:59:51 +0000 en-US hourly 1 https://circuitscheme.com/wp-content/uploads/2016/10/cropped-ecd-32x32.jpg fm Tags - Circuit Schematic Diagram https://circuitscheme.com/tag/fm 32 32 129959653 Mini FM Transmitter with 2 Transistors https://circuitscheme.com/fm-transmitter-with-2-transistors.html https://circuitscheme.com/fm-transmitter-with-2-transistors.html#comments Sun, 09 Aug 2020 02:59:51 +0000 http://circuitscheme.com/?p=110 Here the simple and low cost FM transmitter which powered using two transistors. This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres. The circuit works with […]

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]]> Here the simple and low cost FM transmitter which powered using two transistors. This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres. The circuit works with 9V power supply, use regulated power supply for better quality.

FM Transmitter with 2 Transistors circuit diagram

The coil L1 was consist of 7 turns on a quarter inch plastic former with a tuning slug. The tuning slug is adjusted to tune the transmitter. Actual range on this prototype tuned from 70MHz to around 120MHz. The aerial is a few inches of wire. Lengths of wire greater than 2 feet may damp oscillations and not allow the circuit to work.

Although RF circuits are best constructed on a PCB, you can get away with veroboard, keep all leads short, and break tracks at appropriate points.

One final point, don’t hold the circuit in your hand and try to speak. Body capacitance is equivalent to a 200pF capacitor shunted to earth, damping all oscillations.

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