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DC 4-6V DIY FM Transmitter Wireless Microphone FM Frequency Modulation MP3 Transponder DIY Kits

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DIY FM Stereo Transmitter Wireless Radio


NO. Parameter Value
1 Name FM stereo transmitter
2 Model RF-03PLL
3 Operating Voltage DC 4-6V
4 Operating Current 20-40mA
5 Transmitting Distance 20-80M (no barrier)
6 Transmitting Frequency 87-108MHz (Change frequency by toggle Switches)
7 Power Indication YES; when lower than 4V, LED off automatically
8 Oscillation mode PLL Phase-locked loop
9 Frequency Stability Zero drift
10 Sound Quality Good; Stereo dual channel transmitting, Auto gain control
11 Microphone YES, onboard the PCB
12 Microphone Using Distance 1M
13 Microphone And Audio Input Switch Way unplug the audio wire, the microphone will operate normally

Private radio
Car audio transmitter
Wired audio to wireless

Coding Table:

Low frequency D0 D1 D2 D3 Frequency
S3->L88M L L L L 87.7MHz
H L L L 87.9MHz
L H L L 88.1MHz
H H L L 88.3MHz
L L H L 88.5MHz
H L H L 88.7MHz
L H H L 88.9MHz
High frequency L L L H 106.7MHz
S3->L10M H L L H 106.9MHz
L H L H 107.1MHz
H H L H 107.3MHz
L L H H 107.5MHz
H L H H 107.7MHz
L H H H 107.9MHz

Components List:

NO. Component Name PCB Marker Parameter QTY
1 Metal Film Resistor R8 4.7R 1
2 Metal Film Resistor R9,R22 100R 2
3 Metal Film Resistor R10,R11,R14,R23,R26 2.2K 5
4 Metal Film Resistor R21,R24 4.7K 2
5 Metal Film Resistor R1,R3,R4,R5,R6,R7,R12,R13,R18,R19,R20,R25 10K 12
6 Metal Film Resistor R2,R15 47K 2
7 Ceramic capacitor C27 3P 1
8 Ceramic capacitor C26 15P 1
9 Ceramic capacitor C24 22P 1
10 Ceramic capacitor C3,C6,C19,C23,C25 30P 5
11 Ceramic capacitor C17,C22,C28 101P 3
12 Ceramic capacitor C31,C35 102P 2
13 Ceramic capacitor C16,C21 222P 2
14 Ceramic capacitor C7,C33 103P 2
15 Ceramic capacitor C2,C5,C12,C20 104P 4
16 Electrolytic capacitor C11,C13,C14,C15,C29 1uF 5
17 Electrolytic capacitor C18,C30 10uF 2
18 Electrolytic capacitor C34 22uF 1
19 Electrolytic capacitor C32 47uF 1
20 Electrolytic capacitor C1,C4 470uF 2
21 BH1417F IC1 SOP-22 1
22 Transistor Q2,Q4,Q5 S9018 3
23 Transistor Q1 S9014 1
24 Crystal X1 7.6MHz 1
25 Toggle Switches S1,S3 3P2 2
26 Switch S2 4-Position 1
27 Zener diode ZD1 4.3V 1
28 Varactor diodes VD1 FV1043 1
29 LED LED1 Red 3mm 1
30 Inductance L1 150uH 1
31 Inductance L4 5T 1
32 Inductance L2 8T 1
33 Audio input socket JK1 Stereo 5 pin 1
34 Microphone MIC F10*H7mm 1
35 Battery terminal J1 KF301-2 1
36 Copper wire ANT 300mm 1
37 PCB   73*51mm 1

NOTE: You can complete the installation by PCB silk screen and components list.

Download the Installation Instructions here:


Finished Product Picture:
( Note: The black cable is antenna, should be soldered on the "ANT" place. )

I. Tested by ICStation's Outstanding Partner 12voltvids:

Learn More Details in the Video:
(The language in the video is English)

II. Tested by ICStation's Outstanding Partner LearningZone:

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(The language in the video is English)

III. Tested by ICStation's Outstanding Customer mosslack:

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(The language in the video is English)


IV. Tested by ICStation's Outstanding Partner ELECTROJUANYU:

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(The language in the video is Spanish)

Tested by ICStation's Outstanding Partner randomtronic:

Learn More Details in the Video:
(The language in the video is English)


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1. Yanwen / YunExpress / 4PX / China Post Airmail Service

(1) Due to the high risk of package lost recently, we have to stop using the free shipping way these days. Hope for your kind understanding! And the $5 is for tracking number and delivery insurance ^0^ Enjoy order from us. 

Free Shipping for all orders over $20 ^0^ (with free tracking number and delivery insurance fee)

(2) Shipping time 
Shipping time is 7-20 business days to most of countries; please view below table for exactly shipping time to your location. 

7-15 working days to: Most of Asia countries
10-16 working days to: USA , Canada , Australia , UK , Most of Europe countries
13-20 working days to: Germany , Russia
18-25 working days to: France , Italy , Spain , South Africa
20-45 working days to: Brazil , Most of South America countries

2. DHL/FedEx Express

(1)Shipping Fee: Free for the order which meet the following requirements
Total price of the order >= 200USD or Total weight of the order >= 2.2KG

When the order meets to one of the above requirement, it will be shipped for FREE via EMS/DHL/UPS Express to below country. 
Asia: Japan , South Korea , Mongolia . Malaysia , Singapore , Thailand , Vietnam , Cambodia , Indonesia , Philippines 
Oceania: Australia , New Zealand , Papua New Guinea 
Europe& America: Belgium, Britain, Denmark, Finland, Greece, Ireland, Italy, Luxembourg, Malta, Norway, Portugal, Switzerland, Germany, Sweden, France, Spain, USA, Austria, Canada
Note: Shipping Fee to other countries, please contact orders@icstation-team.com

(2) Shipping Time & Delivery Time

Shipping time: 1-3 days
Delivery time: 5-10 working days (about 1-2 weeks) to most of countries. 

Because the package would be returned to the sender if it had not been signed by the receiver , please pay attention to the arriving time of the package. 


1) APO and PO Box Addresses

We strongly recommend that you provide a physical address for order delivery. 
Because that DHL and FedEx are unable to deliver items to APO or PO BOX addresses. 
2) Contact Phone Number
Receivers' contact phone number is required by express shipping agency for the package delivery. Please provide us with your latest phone number.

3. Note
1) Delivery Time of mixed orders with items in different Shipping Status should be calculated using the longest estimate times listed. 
2) Chinese Holiday Reminder: During annual Chinese holidays, services from certain suppliers and carriers may be affected, and delivery for orders placed around the following times may be delayed by 3 - 7 days: Chinese New Year; Chinese National Day,etc. 
3) Once your order is shipped, you will receive an email notification from icstation.com
4) Track the order which with tracking number via below links:

YunExpress / Yanwen / China Post: www.17track.net/en
FedEx: www.fedex.com


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DC 4-6V DIY FM Transmitter Wireless Microphone FM Frequency Modulation MP3 Transponder DIY Kits