Velleman Microphone Preamp Kit

Brand:| Model: K1803
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.
Part # 
Weight: 0.3828 lbs.  
Your Price
Part # 320-204
Qty:  EA
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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 TypeAudio & Bluetooth
Velleman Microphone Preamp Kit
  • BrandVelleman
  • ModelK1803
  • Part Number320-204
  • UPC5410329018030
  • Product CategoryElectronic Project Kits
  • Unit of MeasureEA
  • Product Rating
    (8 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 4.5 out of 5 by 8.
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: 2013-08-27
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: 2011-02-17
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!!http://marks-mowers.com
Date published: 2012-11-04
Rated 5 out of 5 by from Very good ProductIt's Easy to build and performs very good
Date published: 2011-02-17
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: 2012-08-03
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: 2011-02-17

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Velleman Microphone Preamp Kit

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

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

Would this function well as a guitar preamp?

Asked by: Smeagol
Possibly. To the best of my knowledge, the standard for an instrument interface is a 1-meg load impedance. It is far from clear how this device is set up. It should be possible to obtain that level of impedance with a few circuit modifications. Also, the LM741 is a very basic op-amp (introduced in 1968). I tend to prefer j-fet input op-amps such as the TLO81. You should be able to swap them at will as there are only two basic families, the OPA07 and the more common LM741. In a pinch, all LM741 family op-amps are interchangeable except in high-voltage applications. I would consider this unit cheap enough to try out. From there it should be easy to sketch out the op-amp circuit you really want (which is why most people use opamps; very easy to get an acceptable design). For a real challenge, try to design it with only a few transistors, again with a j-fet on the input and minimal feedback. The only step up from that brings you back to vacuum tubes which is what all the high-end stuff uses.
Answered by: AlonzoTG
Date published: 2011-07-25

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

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

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

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