free shipping at parts express

Manuals & Resources

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.
In Stock
Your Price
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.

View similar products to the Velleman Microphone Preamp Kit
in the Electronic Project Kits product category.


Velleman Microphone Preamp Kit
Velleman Microphone Preamp Kit is rated 4.6 out of 5 by 10.
Date published: 2015-02-02
Rated 5 out of 5 by from preamp for dynamic mic sounds great nice kitJust what I was looking better than I expected.Sounds as good as expensive brand microphone.Very easy kit to build.
Date published: 2014-09-11
Rated 4 out of 5 by from Velleman Microphone Preamp KitNo missing parts. Easy assembly. Worked perfectly when turned on.The level control was different than the picture shows. Level control is mounted vertically on my kit. This makes adjustment of control difficult when preamp is mounted horizontally.
Date published: 2013-08-26
Rated 4 out of 5 by from Filled the bill!I needed a 30+ dB preamp for a small 1 in 1 intercom. With the proper matching transformer, the preamp worked well with an 8ohm speaker as the input transducer.Thanks for your quick and courteous service. Bob Graham
Date published: 2010-12-16
Rated 5 out of 5 by from best thing since sliced bread!!This little preamp is very easy to assemble and performs unbelievably well! I have built it into a stock RCI microphone, and converted it into a screaming loud power mike. For the power supply I used a 12v camera battery (MN21/A23 Duracell)It's cheap and lasts for about two months worth of interment use. I mounted a N-cell battery holder in the mike case for a quick change over. Also I added a micro switch to the preamp to control the power flow to the amp to conserve the battery life. On the back of the mike I drilled a tiny hole to adjust the gain. Also the completed board is wrapped with electrical tape to insulate it, then wrapped with aluminum foil for RF shielding. This little baby cranks!!!Awesome! out performs a D-104 & Turner!!
Date published: 2010-01-08
Rated 5 out of 5 by from Very good ProductIt's Easy to build and performs very good
Date published: 2008-07-19
  • 2016-02-12T06:12CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_10
  • loc_en_US, sid_320-204, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
Velleman Microphone Preamp Kit

this preamp i bought is picking up the 60 cycle hum from the power supply any suggestions on how to reduce or even remove this hum?

Asked by: Sony Tony
Put it in a shielded box, or if the preamp and board need to be in the same box, add a separator shield between. This board will definitely pick up 60Hz hum, especially at higher gains.
Answered by: Guy Z
Date published: 2016-01-23

Can a condenser mic element be hooked to this preamp?

Asked by: iceburgh
yes, but only if the condenser mic utilizes an external phantom power source.
Answered by: TomI
Date published: 2014-12-16

I know this says it's rated for 10-30 volts.  Is there any way to make it work on a 9v battery?

Asked by: tesla_vs_edison
This preamp should "work" on 9 volts, but you may not get the maximum amount of gain specified.
Answered by: DaytonAudio_Rory
Date published: 2014-12-16

If I am using this with a board amp that requires a power supply as well, can I use just one for both somehow?

Asked by: tkroeker
Yes, as long as both devices work with the same power input. You just simply split the output from the power supply.
Answered by: MattP
Date published: 2014-11-24

Does this provide the 48V phantom power for the microphone?

Does this provide the 48V phantom power for an XLR microphone? Or is that something separate I have to get for the mic?
Asked by: gcou
Using this will require a separate phantom power supply for your mic as this does not output phantom power. In fact, this requires it's own 10-30 volt power supply that is not provided with the kit. There are some microphone preamps here on PE that are reasonably priced and provide phantom power. The first one I list below is a small low cost single channel one that provides 21-30 volts of phantom power (this is usually plenty). The second one is a nice 2 mic set up that provides a full 48 volts of phantom power.Or, if you want to use this Velleman kit, you can find some DIY schematics for building your own phantom power supply with a little Googling.
Answered by: Travis Rysdam
Date published: 2013-03-19

The mic has batteries and is plugged into correct jack. . .any ideas???

I bought this type for use in my computer which does have a stereo input jack. The mic is powered by batteries instead of a mic jack power source. I contacted Tascam and they suggested a mic pre-amp. This surprised me since cheaper mics have better gain while this Tascam has to be yelled into. My question is. . .could this plate pre-amp work if I used two to maintain the stereo recording.Thanx in advance if you have a clue. I have also tried USB mics but I'm running Window XP Professional so it requires a driver and will not 'sense' a driver when a hardware device is plugged in.
Asked by: YosarianCat22
This pre-amp should work fine as a pair. First, though, check the volume settings on your computer. If a cheaper, higher-gain microphone has been plugged in, the computer may have turned its own volume down to compensate.
Answered by: Circuitsoft
Date published: 2013-02-16
  • 2016-02-12T06:55CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_12
  • loc_en_US, sid_320-204, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Recently Viewed Products

Parts Express FacebookParts Express TwitterParts Express YouTubeParts Express PinterestParts Express SpotifyParts Express Instagram
Live Chat Software