HT311 Sound Activated Switch / Electronics Kit

Item ID : 184217107
HT311 Sound Activated Switch  / Electronics Kit
Sale Price : RM 15.90
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 : 1853

HT311 Sound Activated Switch  / Electronics Kit


HT-311 is a Sound Activated Switch which can be used to turn the devices on and off when a loud sound was detected.

Product Features

  • Input Voltage: 9-12VDC 
  • Sensitivity is adjustable
  • Used CD4013 IC
  • Used microphone
  • Reverse Polarity Protection
  • 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 a sound was detected, the relay coil will be energized to enable the output. Also, the Red LED indicator on the PCB will turn on.
  • When the sound was detected 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 3:27:50 PM

Buy with confidence, we have 251 Good Ratings from buyers!
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Buyer: mt****   (28: 21+,100%)  |  Date: 23/10/2016 22:25  | Item ID:169181379
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Buyer: aw****   (0: 11+,100%)  |  Date: 21/9/2016 1:5  | Item ID:169565420
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Buyer: za****   (0: 9+,100%)  |  Date: 14/9/2016 10:41  | Item ID:169565420
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HT311 Sound Activated Switch / Electronics Kit
RM 15.90 Shipping fee (*Exclude GST):Peninsular: RM 7, Sabah/Labuan: RM 10, Sarawak: RM 9,
International: RM
Combine Shipping allowed

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Note : The seller assumes all responsibility for listing this item. Please contact the seller to resolve any questions before or after purchasing the item. Currency is RM (Ringgit Malaysia) unless otherwise noted.

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