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CAT # MK-1803 (6 Reviews) Write a Review

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Product Description
Velleman# K1803.
This kit has been developed as pre-module for a number of audio applications where there is insufficient input signal. Applications as a microphone pre-amplifier or for level correction.

• Power supply: 10-30V DC / 10mA
• Adjustable output level: max. 40dB
• Frequency range: 20Hz to 20kHz ± 3dB
• Max. input signal: 40mV
• PCB dimensions: 1.2 x 1.7"

Note: Kits cannot be returned or exchanged once assembly has begun.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews (6 Reviews)

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universal mono-preamplifier kit

Reviewer: from Tn.

Great kit...but be aware that inserting resistors prior to soldering and then bending the leads outward to hold them could cause a dirrect short with this kit if your not careful. Other than this, a great kit.

4 of 5 people found this review helpful. Do you? Yes No


Reviewer: from Moab, Utah

Not a kit for beginners. Know your op-amp math to recalculate the feedback resistor to set the gain lower. The gain is set for 100 and using the garbage 741 op-amp results in a terrible loss of bandwidth. A gain of 5 or less is better. Replace the volume control with a fixed 1K resistor and hang a 10K pot on the frontend to control the volume. This kit runs best at 15 volts or higher. A lower power source than that results in massive distortion and clipping.

5 of 5 people found this review helpful. Do you? Yes No

recommended power supply

Reviewer: from Sacramento, CA

Can anyone recommended a good, affordable power supply for this preamp?

2 of 3 people found this review helpful. Do you? Yes No

Chip preamps...

Reviewer: from Los Angeles, CA

..don't work very well INSIDE a transceiver!
If you were hoping to use this in your CB radio, forget it! The chip will sniff up every stray signal inside the radio and totally distort your audio - if you were to encase this unit in copper flashing, and heavily bypass the input and output it might be ok. The gain is waay too high using 12vdc - 3 vdc is a little better, but a preamp microphone will cost you about the same as this kit, so the savings will be your time.

2 of 3 people found this review helpful. Do you? Yes No

Just a thought

Reviewer: from USA

`haven't built but maybe replace the 741 with a TL071? Same pinout, better quality/sound. JFET etc...

2 of 2 people found this review helpful. Do you? Yes No
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