About relay module for clap switch- operate 100-240V appliance


connecting a lamp

Description: This is a dependent DIY kit module that has to be used with a clap_switch available at buildcircuit.net. This kit DOES NOT work independently as a clap switch. It is useless without this_clap_switch_kit. So, you need to order that kit also.

You can read about the clap-switch at this link.

The relay module is operated by this clap switch

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The relay module comes as a pack of parts kit and is easily assembled if you can follow the silkscreen indicators (labels) and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes. Both the kits operate with 9V batteries.

Step 10- Solder 5V relay and your kit is ready for blog


  • A DIY kit module that works with this_clap_switch_kit. It is useless without the clap switch.
  • >Operates a 100-240V lamp with clap/loud sound.
  • Supply voltage: 6V-9V. The same power supply can be used for this_clap_switch_kit.
  • There are two supply input points: a DC barrel and a screw terminal. You can use one of the points to power up the kit.
  • Dimension: 48.26mm x 49.53mm.
  • Relay specification: Activation voltage: 5V DC. Controls appliances operating at 10A 250VAC, 10A 125VAC, 10A 30VDC, 10A 28VDC. Suitable for Europe, North America, Australia and New Zealand.

Schematic of relay module:

Click on the image to enlarge it.

schematic relay module for clap switch

The kit package contains the following components:

  1. 1 x Bare PCB with Silkscreen indicators
  2. 2 x 1K carbon film resistor
  3. 1 x 4.7K carbon film resistor
  4. 1 x 1N4001 diode
  5. 1 x LM7805
  6. 1 x BD139
  7. 1 x 0.1uF (code- 104)
  8. 2 x 10uF capacitor
  9. 1 x PC817 optocoupler
  10. 1 x SPDT switch
  11. 1 x 5V relay
  12. 1 x 3 pin screw terminal
  13. 1 x 2 pin screw terminal
  14. 1 x DC barrel
  15. 1 x 5mm LED
  16. 1 x 9V battery connector

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