upc1651 fm transmitter circuit

Using the UPC1651 FM monolithic circuit can be designed a very simple low cost FM transmitter electronic project. This UPC1651 FM transmitter circuit is specially designed as a wide band amplifier covering the HF band trough UHF band. Audio signal from the microphone are fed to the input pin of the IC via capacitor C1. C1 acts as a noise filter.

The modulated FM signal will be available at the output pin of the IC. Inductor L1 and capacitor C3 forms the necessary LC circuit for creating the oscillations. L1 coil has 5 turns of 0. 5 mm copper wire with 4 mm coil diameter. Adjusting the C3 capacitor will vary the frequency of the transmitter.

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