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Velleman Microphone Preamp Kit

Brand:|Model: K1803|Part # 320-204
This kit was developed as a pre-module for a number of audio applications where there is insufficient input signal. Ideal for use as a microphone pre-amplifier or for level correction. Output level is adjustable with up to 40 dB of gain.
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Part # 320-204

Product Details

Velleman Microphone Preamp Kit

This kit was developed as a pre-module for a number of audio applications where there is insufficient input signal. Ideal for use as a microphone pre-amplifier or for level correction. Output level is adjustable with up to 40 dB of gain. Requires power supply of 10-30 VDC/10mA (not included). Frequency range: 20-20,000 Hz. Output impedance: 1K ohm. Max input signal: 40mV. Dimensions: 1-3/4" x 1-1/4". Net weight: 1/4 lb.

Product Specifications
  • Project Kit TypeAmplifiers & Audio
Velleman Microphone Preamp Kit
  • BrandVelleman
  • ModelK1803
  • Part Number320-204
  • UPC5410329018030
  • Product CategoryElectronic Project Kits
  • Unit of MeasureEA
  • Product Rating
    (10 Reviews)
  • Weight0.3828 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Velleman Microphone Preamp Kit
Velleman Microphone Preamp Kit is rated 4.6 out of 5 by 10.
Rated 4 out of 5 by from Good value and performance for the moneyI ordered three units needed for microphone preamps on some old vacuum tube transceivers. Easy to assemble and woked very well.
Date published: 2008-06-24
Rated 4 out of 5 by from Easy to assemble, works as advertisedI bought this to put together an inexpensive PA system. The only feature I wish it had was an external 1K trim pot. I wired in a 5K linear pot from Radio Shack, and it works tolerably well with it.
Date published: 2008-05-10
Rated 5 out of 5 by from Good value and easy to assembleThis is a good preamp for the money. However, the power supply recommended for it, part No. 120-1100, would not work with the preamp without additional parts, so I wound up using a battery.I'll add more remarks on the review for 120-1100.
Date published: 2008-02-10
Rated 5 out of 5 by from excellent preampThis is a very easy to build kit for a preamp. Used it to interface a TV to a power amp for DVD watching with bigger sound. Needed two for stereo.
Date published: 2007-10-21
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Product Q&A

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Velleman Microphone Preamp Kit

Boosting electret microphone

would this product be suitable for boosting an electret microphone signal (3 ohms) to line level (10 ohms)? The speaker amp I am using is line level input only..
Asked by: Gene621
Yes this preamp will work for this application.
Answered by: MattP
Date published: 2012-10-12

My Tascam TM ST1 Lacks Gain. . .

It is a stereo microphone I bought to use on my PC but I have to yell into it for it to pick up anything. Would this preamp work for such purposes and would I need 2?
Asked by: YosarianCat22
first of all, you should be getting plenty of gain with your Tascam microphone. Make sure you have it plugged into the mic input of your computer (not the line input)...second of all, this mic requires a powered mic jack. It's possible you need to update your driver for the sound card in your computer. Try these fixes first.
Answered by: samplerman
Date published: 2013-02-14

Reccomed Power supply?

Hello.Can you recommend a power supply from Parts Express for this little guy? Thanks!
Asked by: nonsuchpro
This amplifier requires a clean DC supply between 10 and 30V. The current draw is little enough that almost any DC supply that PE sells will work.
Answered by: Circuitsoft
Date published: 2012-06-09

i have cell phone with week audio output would this work to get a stronger audio output

Asked by: gecko13662
Do you mean to increase the volume of the audio line out before connecting it to an external amplifier or receiver, like using your phone to play MP3s on you home or car stereo? Maybe, but the stated maximum input voltage is 40 mV, and I am sure any phone with a headphone jack is putting out at least 1.5V. That's almost 40 times the maximum input voltage this says it can handle! However, it looks like one of the raters used it to boost the line out of his TV, and I would have the same expectations of that. It's also important to note that this will only handle one channel of audio, so to use it in the application that I think you are looking to use it for, you would need to buy two of these. If you did this, you would need to build both kits, make some custom interface cables, find an adequate power supply, wire that up, and then balance the two channels at an acceptable volume. Then you can use your stereo to change the volume, and not have to fuss with turning the pots on each board to change the volume.Also, remember these are not pre-built, they are kits that you will have to solder together. It sounds like for your purposes you may be better off just getting something like a Fiio headphone amp or Boostaroo.
Answered by: Travis Rysdam
Date published: 2012-10-23

Would this function well as a guitar preamp?

Asked by: Smeagol
It is meant for vocals..but it will work any signal you put to it as far as line guitar. MO
Answered by: Keith P
Date published: 2011-07-24

What are the dimensions of this piece?

Asked by: gfloering
This kit measures 1-3/4" x 1-1/4".
Answered by: mikevv
Date published: 2011-03-14
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