Introduction
HT699 is a simple FM Transmitter which using microphone to broadcast user's voice to any FM Radio. The frequency band is selectable from 88MHZ - 108MHZ.
Product Features
- Input Voltage: 9V-12VDC
- Frequency : 88-108MHZ
- Used BA1404 IC
- Transmission can be listened to on any FM Radio.
Assembly Instructions
- Check off the components in the package against the component listing before assembly.
- Start with the smallest components working up to the taller components, soldering any interconnection wires last.
- Place and Solder the components into the board, make sure the components are in right position according to the overlay of PCB.
Test & Adjustment
- After assembled, please check & ensure the value & polarity for all components were inserted into PCB correctly, wrong polarity connection of capacitors can caused explosion of failure.
- Next, ensure all these leads are soldered, no solder bridges between adjacent pads and no dry joint.
- Once confirmed, connect the power source to the circuit board.
- Use a ceramic screwdriver to adjust the variable coil (L1) to approximately mid-track position, and then adjust the variable capacitor C6 slowly to select the desired radio station while talking to the microphone.
- If the noise is still detected, increase or decrease the setting of variable coil (L1) to achieve the best performance.