Sound to RC Servo Driver

  • Rajkumar Sharma
  • easy
  • Tested
  • SKU: EL66703
  • Quote Now

New Version: A new version of the Sound to RC Servo is available “Sound to RC Servo Driver v2.0 – Arduino Compatible

This project is designed for Animatronics and Puppeteer applications, however, it can be used in other applications like sound-responsive toys, robots, etc. Especially this project helps to move the jaw or mouth of an animatronic creature.

The project moves the RC-servo once receives any kind of sound.  The rotation angle depends on the sound level, the more the sound level more the movement. The movement of the servo is proportional to the sound level.

The circuit has 4 channel servo drivers, the First channel is driven by sound, and the rest 3 RC servos are controlled by the onboard trimmer potentiometer, these 3 channels help to drive other movements of the animatronics figure.

Sound Received by the microphone is converted to DC voltage, PIC16F72 microcontroller converts DC voltage into the RC PWM signal. The circuit works with 5V DC and it is advisable to use a battery for low jitter.

If you want to drive the input with a direct audio signal remove R3 (10K) and microphone and feed audio to C6, we would advise using a potentiometer (10K to 20K) before feeding audio to C6 to adjust the input level. If the audio source is from the headphones output you can remove Q1 and feed audio to the anode of D3. Refer to “Schematic with Analog Audio input” below.
New Version: A new version of the Sound to RC Servo is available “Sound to RC Servo Driver v2.0 – Arduino Compatible” with some additional features and enhanced sensitivity.


  • Supply 5V to 6V DC (1.5V X 4 AA or Large 6V SLA Battery)
  • 4 Channel RC Servo Drivers
  • 1St Channel works with Sound
  • 3 Channel works with an onboard potentiometer
  • CN7 Supply
  • D2 Power LED
  • CN6, CN8, and CN9 Connectors for RC Servo work with Potentiometer
  • Trimmer Potentiometer PR2= SERVO 2, PR3=SERVO 3, PR4=SERVO4
  • CN5 Connector for RC Servo works with Sound

Schematic with MIC input

Schematic with Analog Audio input

Parts List
32C1,C60.1uF SMD 1206C313097
42C2,C312pF/50V SMD SIZE 1206C113882
51C41000uF/16V ELECTROLYTICC357639
61C5220uF/25V ELECTROLYTICC106732
71C710uF/63V ELECTROLYTICC216300
81D11N4007 SMD SM4007C727082
91D2RED LED SMD SIZE 1206C192674
101D31N4148 SMD C2828417
143PR2,PR3,PR410K TRIMMER POT - PT10LV10-103A2020 531-PT10LV113A22PMS
151Q1BC847 SMDC181140
161R2470E SMD 1206C269761
171R41M SMD 1206C115422
181U1PIC16F72-I/SO SMD 579-PIC16F72-I/SO
191X14Mhz CRYSTALC240919
204R1, R3,R5,R610K SMD 1206C118075




Customer Applications

PIC16F72 Datasheet

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Hi there, Thank you for the information. Where can I get this board? Is sold somewhere?

Joseph A Mezzo

Yes let me know the cost for 24 pieces

Fernando Gomez

can you still produce these boards?


Will this board work with an external input. Say direct input from a sound source like a 3.5mm jack playing a voice? Also, correct me if I’m wrong but the other 3 channels could be used if say you have a mouth using 2 servo’s (one on each side of jaw) …Am I correct? Let me know as we would be willing to build one..just need to understand a bit more.


Wish they would had replied because I too am curious

Steve Aucott

Hi how much to have 25 of these units to be made.

Robert Gould

Hi, I am interested in buying 2 or 3 of these boards . Can you please tell me a price ?


Hi, I am interested in buying one of these boards. can you tell me a price


How much would it cost to buy 5 of these boards (pre-assembled and ready o go?)


Do you also happen to have the CPL file for this?

Arif Sethi

Hello, can someone help lease. i’ve created the cicuit it turns etc. but do not work. no reaction to sound or movement usin potentiometer.


Hi, I just recieved the assembled board. Super fast shipping and it works fantastic with the in-built mic. My final project will need the analog input, and I am not sure on how to do the mod. the info on this page with the schematics is very detailed, but being a complete beginner they don’t really make much sense to me unfortunately. Could you provide more instruction or perhaps a picture of the board in the analog input configuration? Thank you so much in advance.

David Davidson

do you sell just the pic chip????


Do you sell this completely assembled if so how much? Does it run on ac or dc?


I’m trying to understand the audio in circuit. It looks like you filter DC, then rectify, then smooth. Is this just to get a smoother version of the input signal? I’m guessing the smoothing capacitor is not large enough to completely smooth things back to DC. Is this right? Thanks.


hi. i want to order this pcb board plz email cost


Hi, I was wondering if your could clarify the steps to remove the mic and attach a direct line to this board.
You have listed:
“if you want to drive the input with a direct audio signal remove R3 (10K) and microphone and feed audio to C6”

Does this mean to unsolder the mic and the chip R3 from the board and solder line in connection to C6 chip?


is there a possibilty to have the source code , i do have a bunch of mix pic micro , but not the 16f72 or can i use
another pic using the hex

thanks in adance


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