HT311A Sound Activated Switch (Twice Clap) / Electronics Kit

Item ID : 184217108
HT311A Sound Activated Switch (Twice Clap) / Electronics Kit
Sale Price : RM 25.44
Price includes GST (6%)
Shipping (*Exclude GST) :
Peninsular :RM7Sabah, Labuan:RM10Sarawak:RM9
Option :
Ship To : Within Malaysia, ship by Courier Services, Self Collect
Item at : Johor Bahru / Johor
Views : 1582

HT311A Sound Activated Switch (Twice Clap) / Electronics Kit


HT-311A is a Sound Activated Switch which can be used to turn the devices on and off when a loud sound was detected twice such as clapping your hands twice.


Product Features

  • Input Voltage: 9-12VDC 
  • Sensitivity is adjustable
  • Used CD4001 & CD4011 IC
  • Used microphone
  • Less interference 
  • LED Indicator for Relay On
  • With Relay Output


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.
  • If all goes well, this kit starts function as following:
  • When user claps the hand twice, the relay coil will be energized to enable the output. Also, the Red LED indicator on the PCB will turn on.
  • When user claps the hand twice again, the relay coil will be de-energized to disable the output and the RED LED indicator will turn off.
  • Adjust the preset (P1) for the sensitivity of sound activated switch.



  • Package includes schematic, printed circuit board and components
  • You need to have a soldering skill and basic knowledge of testing
  • For any inquiry or other technical problem, please contact us through or 07-3344473


Last Updated @ 1/6/2016 10:14:08 AM

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HT311A Sound Activated Switch (Twice Clap) / Electronics Kit
RM 25.44 Shipping fee (*Exclude GST):Peninsular: RM 7, Sabah/Labuan: RM 10, Sarawak: RM 9,
International: RM
Combine Shipping allowed

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