A neat little FM transmitter with PLL (Phase Locked Loop) control. Includes schematics, component lists and Printed-Circuit-Board (PCB) designs.
The circuit diagram is divided into 3 separate sections: the RF part, the PLL (Phase Locked Loop) control circuit and the Audio and Power Supply circuit. Each circuit diagram includes a full parts/component list.
The page also includes a PCB design, so you won't need to worry about making the circuit on a verobroard (strip-board), which would obviously be a negative on circuit performance anyway! Instructions on how to tune the RF circuit are included, and the circuit does seem to be OK, so it should be easy enough to get this transmitter on-air.Quoted Technical Specifications:
- Supply voltage: 12 V from accumulator or regulated power supply
- Supply current (HI/LO): 270/170 mA
- RF power HI: 1 W
- RF power LO: 0,2 W
- Impedance: 50-75 ohm
- Frequency range: 87,5-108 MHz
- Modulation type: wide-band FM
- Modulation inputs: line, mic, RDS/MPX
- PCB dimensions: 11,3 x 8,8 cm
Please don't forget to report back if you choose to build this circuit.
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