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Velleman 7W Mono Audio Amplifier Solder Kit

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Quoting product code: VF55K


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About this product


Product overview

• Amplify a weak input signal on an audio device
• The circuit is protected against overheating and short circuits
• Easy and fun to solder with 19 parts
• Requires a 8-18V DC power supply (not included)

What can do with this kit?
Get great sound out of your mono audio devices with this 7W audio amplifier (manufacturer’s code K4001). Send your audio to an active speaker, subwoofer or other devices. The circuit is capable of producing 7W peak output or 3.5W RMS output, and works on a single channel input ideal for mono devices like microphones. This kit is capable of boosting signals up to 20Hz-20kHz frequencies, the normal human hearing range. With a compact 35mm x 55mm circuit, this kit will fit in almost anywhere. With 19 parts, this is a great kit for those looking to get more practice with soldering. This kit is also available to buy prebuilt (order code N08AA).

What can I learn from this mono pre-amp kit?
Practise soldering and learn about electronics and circuits with this pre-amplifier kit. It uses resistors, capacitors, and an integrated circuit (IC) chip, and will help you learn how to connect a circuit. The circuit is designed to take a small signal and amplify it without changing the pattern. This kit is built around the TDA2003 IC chip. Since the IC chip creates heat, the kit also includes a heatsink to dissipate the energy. This circuit has protections against short circuits as well as overheating. This kit requires a soldering iron and solder, and may require wire cutters.

What can I do with this kit?
A great kit for the audio enthusiast or those looking to improve their soldering skills. Putting the kit together is just the start – you may want to create an enclosure (not included) for the kit to protect the electronics, just take care not to block the inputs and outputs. You can also add on convenient socket/plug for your inputs and output so you can plug in quickly and easily. You could even add a potentiometer (not included) and create a volume control. This kit requires a DC 8-18V power supply (not included) and a 15V power supply is recommended.


Operating Specifications

Frequency Range:

20-20,000 Hz


4 ΩΩ

Product Specifications

Soldering Required:


Dimensions & Weight





could you tell what the supply voltage is to this item please ? and what impedance the speaker out should be ? thank you

Asked by: Mad Sparky
From the specification table: Impedance:4 ohms @ 3.5W 8 ohms @ 2W Power supply requirements DC 8-18 V @ 0.5 A (15 V recommended)
Answered by: Gareth
Date published: 2017-05-23

Just wanted to know the over all height as I will be putting this into an enclosure. 35x55x??.

Asked by: Ryan
This is 32mm ( heatsink )
Answered by: Dominic
Date published: 2016-12-21

Will this work with a stylus/turntable pickup as the source?

Asked by: ColinC
No it won't - you will need an RIAA stage for turntables, and possibly a pre-amp stage too
Answered by: Mr_C
Date published: 2016-09-09

Will this work on a 9V battery or other battery? Do you sell a suitable mains mini power supply for this?

Asked by: Pooper
Power supply requirements DC 8-18 V @ 0.5 A (15 V recommended)
Answered by: Dominic
Date published: 2016-08-20

What is the required supply voltage to run the amp and what is the typical power consumption? Thanks
Asked by: reuben
Supply voltage 15V but will operate from 8-18V.Power consumption typically 7.5W.
Answered by: DC
Date published: 2015-07-17

can i put a 3.5mm jack into this for an mp3 player/ipod?
Asked by: Curtis
No sorry this product does not support that.
Answered by: JK
Date published: 2015-07-17

Can I use the stereo output (via suitable connectors) of my TV as the input to this module?
Asked by: Dennis Bolton
Yes the product does support that.
Answered by: JK
Date published: 2015-07-17

Does this come pre-made or as a component kit to solder yourself?
Asked by: Joe
This is a kit. (bag of components and a board)
Answered by: GM
Date published: 2015-07-17
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