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Universal mono pre-amplifier

Velleman K1803: Universal Mono Preamplifier Kit

Velleman K1803

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Universal Mono DIY Preamplifier Kit

Boost audio signal to your amplifier with the Velleman K1803: Universal Mono Preamplifer Kit. This kit requires an intermediate level of soldering experience, as well as, a basic understanding of electronic components. It's recommended for audio engineers, A/V specialists, music-lovers and electronics enthusiasts.

This DIY Universal Mono Preamp Kit was developed as a pre-module for applications where there is an insufficient audio input signal. Once assembled, this unit can act as a microphone preamplifier or audio level corrector. This audio preamplifier kit has an adjustable trimmer to control the output signal range. The K1803 also works great as a preamp for dynamic microphones or your own unique DIY project.

For a Stereo Preamp Kit, check out the Velleman K2572: Universal Stereo Preamplifier Kit.

Velleman K2572: Universal Stereo Preamplifier Kit


  • Perfect for correcting audio levels, microphone preamplification and strengthening audio signals for your DIY project
  • DIY soldering kit - learn the ins and outs of how a audio preamp kit works

Recommended Assembly Tools


Power Supply 10 - 30V DC / 10mA - Adapter Not Included
Output Impedeance 1 Kohm
Adjustable Output Level 40 dB max.
Frequency Range 20 Hz to 20 kHz ± 3dB
Max. Input Signal 40 mV
PCB Dimensions 1.2 in. x 1.7 in. (30 mm x 40 mm)

Additional Information

Difficulty Level 2
  1. Great Little Amplifer. review by Barry on 2/1/2018

    Great Little pre-amplifer. With a 100mv PP input sine wave, the amp's output was 4V PP. Clean signal too.

  2. Good Building Block review by Dr. Hyman Lipschitz on 1/11/2017

    One of the small items that impressed me was the inclusion of more little headers than the instructions call for. My kit uses three headers in the gain control position to allow the use of front panel pots. And there's even
    one left over. This is not an error, because I bought two kits and they were alike in parts. The shipping from Velleman was kind of pricey.

  3. What a great find review by Anthony on 4/30/2016

    The perfect building block for my audio projects

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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

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.

Frequently Asked Questions

Q. What is the minimum input signal (in mV) for the Velleman K1803?


The K1803 has a recommended input signal range of 0 - 40 mV.

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 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product