The FM modules with USB function of Vire Silicon. Co Ltd is an excellent miniature FM module with USB input and digital display for functions. It is available as assembled board with remote.The VIRE-FM 01C FM –USB Module is available as readymade assembled board. Its output can be connected to power amplifier or into the amplifier of VCD player, Car stereo etc.
The module has the following important features
1. FM Channels 87.5 – 108 MHz
2. Song number display
3. Song selection mode
4. Auto channel scan and save provision
5. Digital volume level display
6. Forward and backward selection
7. Volume Up /down buttons
The circuit board is available as kits with connecting wires. It is necessary to connect Remote Sensor, USB socket and Amplifier with speaker. The circuit requires 5 Volt regulated power supply.
On the PCB, there are markings for wire connections and wire sets are provided along with the kit. The markings on the back of the PCB indicates
IR Sensor TSOP 1738 connection
G-Ground – Pin1 of sensor
R1 – Output of Sensor-Pin 3 of sensor
3.3 V Supply – Pin 2 of sensor
Connect the wires connected to these points to the sensor
4. 5V- 5 Volt will be available from the board itself
Output to Amplifier
L – Left channel
G – Ground
R – Right channel
Use a 10 K Lin dual volume control between the output lines (L and R) of the module and the amplifier. Set minimum volume (2 to 4) in the module using remote and adjust 10 K pot to get clear sound from the speaker. Then increase the volume using remote to the required level. The module can give 1 to 50 range volume.
Antenna is necessary if the signal strength is weak .Connect 30 cm plastic wire to the point ANT on the PCB
5 Volt regulated power supply is necessary for the circuit. Make a regulated power supply with IC 7805 with 1000 uF filter capacitor. If the power supply is not well regulated or with ripples, performance of the circuit will be poor.
Remote less operation
On the PCB, connections V+, PM, CH V-, P etc are given to connect membrane switches for manual operation.
The FM board is manufactured by VIRE SILICON CO., LTD.
HK OFFICE ADD:UNIT 250A, 25/FLOOR,BANK OF AMERICA TOWER,CENTRAL,HONG KONG
FACTORY ADDRESS :BUILDING NO-02,3/FL,XIAWEI,GANLI TECHNOLOGY PARK,BUJI,SHENZHEN,CHINA
Data source http://www.vire.net.cn
For more details: http://usbmpthree.webs.com/
FM-USB Module with SD Card reader – Pin connection
The FM board has delicate components. Connect wires carefully. To get FM stations programmed, first use a long plastic wire as antenna. There is a point in the board ANT to connect antenna. If you scan FM stations, it will automatically search all the available stations and save the stations as 1, 2, .3 etc. After that a short piece of wire 30 cm is sufficient for antenna. Another important thing is power supply. Use a 5 volt regulated supply with heat sink for the board and 12 volt 500 mA for amplifier. Use a10 K Log dual pot as volume control. If there is a hum from the speaker, not connect the Gnd wire of output (that is output to volume control. connect only two lines) to the volume control.
The virenet also released boards having front panel with fixed USB socket and SD card reader, mp4, video boards etc. All these boards are available in the market.
Article in Word format is available in Design Note page