MCM Electronics

Universal Audio Preamplifier By Kemo Electronic (M040N) MCM Part #28-12754

5 stars 1 review
MSRP: $19.99
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Specifications Top

Universal Preamplifier

For microphones and other weak signal sources; this mini module is simply connected between a power amplifier and a signal source.

  • Input/output voltage: 2-50mV/0.2-5V
  • Input/output impedance: 50Kohm/1Kohm
  • Amplification: 40dB
  • Requires: 9-24VDC
  • Size: 30x25x15mm

Part Numbers
MCM Part #:28-12754
Kemo Electronic Part #:M040N
Package Specifications & Dimensions
Weight:0.2 lbs.
RoHS Comp:Yes
Warranty:90 days
Need to Return?
Length:5 in.
Width:5 in.
Height:1.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

Product Reviews Top

  • by rich38

    on 11/14/2013

    Excellent product

    Overall: 5 out of 5

    I used this 28-12754 preamplifier along with the 28-6400 amplifier to make a "one-way intercom" using a speaker as a microphone. I found that 9-Volts was best to power the preamp, with 12-Volts best for the amp, both regulated from the same source. I put a 10-K pot between the amps as recommended, and there is more gain than I will ever need. Separating the units by about 6-inches as well as using shielded wire was necessary to prevent feedback. Performance far exceeded standard intercoms as far a sound quality and output volume.

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