Build Your Own Digital FM Transmitter with VMR6512 Module
FM transmitters are popular among electronic enthusiasts and professionals. Learn how to create a simple, stable, and digitally controlled FM transmitter using the VMR6512 module.
The VMR6512 module is a complete RF block integrated into a single chip, eliminating the need for inductors and trimmers in a basic FM transmitter. According to the datasheet, the VMR6512 integrates advanced features like a digital signal processor, frequency synthesizer, RF power amplifier, and more, allowing for high-quality FM audio modulation without external components.
The operational frequency range of the VMR6512 module is 88.0 MHz to 108.0 MHz. Check out the schematic diagram of the transmitter below:
Figure 1: Schematic diagram of the FM transmitter
The transmitter design includes LED D1 for power indication, capacitors C1 and C2 to reduce noise, and three tactile switches for various functions:
- SW1: Resets the module
- SW3: Increases frequency (+0.1 MHz)
- SW2: Decreases frequency (-0.1 MHz)
Explore the top and bottom layer views of the PCB in Figures 2 and 3, and a 3D view of the fully assembled board in Figure 4.
Figure 2: Top layer view of the PCB
Figure 3: Bottom layer view of the PCB
Figure 4: 3D view of the assembled board
For antenna connection, an SMA connector (P2) is used. Remember to comply with broadcasting regulations before increasing transmission power.
If you have any inquiries about PCBs or PCBA, contact us at info@wellcircuits.com.
