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7w mono audio amplifier

Velleman K4001: 7W Mono Audio Amplifier

Velleman K4001

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Velleman K4001 7W Mono Audio Amplifier (Electronic Project Kit -Soldering Required)

The Velleman K4001 kit is a small, but powerful multipurpose amplifier. The K4001 circuit using the TDA2003 integrated circuit that is thermally and short- circuit protected. Suitable for a 4Ω or 8Ω speaker and has an input sensitivity of 40mV rms. For a mounted version, view the VM144.



  • Music power output: 7W / 4ohm
  • RMS output: 3.5W / 4ohm or 2W / 8ohm
  • Total harmonic distortion: 0.05% (1W / 1kHz)
  • Frequency response: 20Hz to 20kHz (-3dB)
  • Signal/noise ratio: 86dB (A weighted)
  • Input sensitivity: 40mV / 150Kohm
  • Supply voltage: 15V DC (8 to 18V DC possible) / 0.5A
  • Dimensions: 2.2 x 1.4"


Additional Information

Difficulty Level 1
  1. 7W Mono Amplifier review by The Doctor on 8/23/2017

    I have purchased 5 of these 7W Mono amps so far and will buy more. These make great little Guitar Cigar Box Amps. I use them mostly with 3" speakers, but have also used them with 6" speakers. The bigger the speaker the better it sounds.

    I installed the Volume Pot, as per the instructions, and also added a 470 Ohm Potentiometer in place of the 470 ohm resistor, now I can adjust the Gain on the amp from clean to coarse.

    Great product, I highly recommend this item.

  2. I like this little amp review by Mitch on 6/19/2017

    I haven't tweaked this too much yet, but as built, this little amp actually sounds good and is reasonably loud and clean with just a guitar -> Boss Delay -> K4001 -> Weber C10Q 8 ohm speaker. That's running off a Boss 9V digital supply. Easy to build, instructions are clear. There is some extra hum when connected out of my tube preamp. But like I said, I may just need to tweak it with coupling caps, shielded cable etc.

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Parts list
English assembly instructions through illustrations, pictures, etc.

Assembly instructions
Written multilingual manual explaining how to build the kit

Info Sheets

Resistor colour code

Connection diagram of a 7W amplifier

Connection diagram of a 7W amplifier with a volume regulator

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

Connection diagram of a simple supply for the 7W amplifier (K4001) using a transformer, a rectifier & a capacitor.

Frequently Asked Questions

Q. Is the K4001 offered pre-built?


The prebuilt version is VM114.

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