Velleman LED Sound to Light Solder Kit

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Quoting product code: VX77J


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About this product


Product overview

• Create a visual alert for loud noises such as telephones, alarms and doorbells
• Adjust the sensitivity with a potentiometer
• Fun and simple to solder with 33 parts
• Requires a 9V battery (not included, Order Code L46AL)

What can I do with this sound to light kit?
Get a visual warning for loud noises with this four LED kit (manufacture code MK103). You can create a warning light for a noisy fan by using the potentiometer to set a microphone’s sensitivity. Alternatively, create a visual signal that notifies those hard of hearing when the telephone or doorbell goes off. Sized just 40mm x 55mm x 35mm this kit can be fitted in almost anything. With 33 parts, this kit is great for beginners or those looking to push their soldering to the next level.

What can I learn about with this solder kit?
Practice soldering and learn about electronics and circuits with this sound to light solder kit which uses resistors, capacitors, transistors, LEDs and potentiometers (variable resistors). Learn how the components are connected in a circuit and get practical experience soldering them. A microphone increases it output as the sound gets louder the potentiometer controls at what point the LEDs switch on. This kit requires a soldering iron and solder and may require wire cutters.

How easy is this kit to solder?
Easy to solder, this kit is great for beginners learning about electronics and those who have mastered the basics. Have fun putting together your kit then you can expand on your project. You could create an enclosure (not included) for the circuit to protect the electronics or build it into a hand held visual alert. This kit runs off a DC 9V power supply and comes with a holder for a 9V (PP3) battery (battery not included).


Operating Specifications


0.5 – 12 mAmA

Product Specifications

Soldering Required:


Dimensions & Weight







Would it be possible to replace the microphone with wires from a speaker input say from a separate sound playing module?

Asked by: Morgan
Unfortunately we are unable to guarantee full compatibility for this item, as this is not the manner for which it was designed to be used.
Answered by: Dominic
Date published: 2017-02-10

Can it contain 4 different coloured LEDs

Asked by: Sailor Bob
I do not see why not as long as you match the voltage / current of the leds in the circuit Maplin would not be able to advise on the modification or redesign of the unit I am afraid
Answered by: Les
Date published: 2015-12-08

Can you replace the microphone with a headphone cable?
Asked by: Jude Brown
Sorry the product does not support that.
Answered by: Les
Date published: 2015-07-17

hi can you connect more light to it?
Asked by: fabio pasqualone
No sorry this product does not support that.
Answered by: DH
Date published: 2015-07-17

can you attach this to the led running light
Asked by: peter aslett
No sorry this product does not support that.
Answered by: DH
Date published: 2015-07-17

Could one remove the built in microphone and connect to an existing sound device.
Asked by: Ryan
i cant see why not
Answered by: DM
Date published: 2015-07-17

can they be powered of a car battery?
Asked by: Paul
yes they can
Answered by: SG
Date published: 2015-07-17

are there 4 different frequency bands controlling the LEDs?
Asked by: steve
Yes the product does support that.
Answered by: JK
Date published: 2015-07-17
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