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Home | Product Categories | Breakout Boards | PRT-08872

Mic Preamp

sku: PRT-08872 RoHS Compliant

Description: This is a simple microphone preamplifier circuit for a wide range of microphone types, with good pre-amplification to attach to your larger stereo amplifier. This circuit is suitable for use with normal stereo amplifier line/CD/aux/tape inputs. The microphone preamplifier works great with guitar pickups, piezo disks, and can take both dynamic and electret microphone inputs (preamplifier provides power for electret microphone elements). This is a simple, easy to build circuit that is flexible and very handy when working with microphones and amplifiers.

Board does not come assembled. You will need to purchase the components separately, check the related items at the bottom of the page for available components. Also, reference the schematic for the BOM.

Features:

  • Very simple one transistor circuit
  • Amplification 35 dB, flat frequency response from 20 Hz to 20 kHz
  • Low distortion but certainly not studio quality
  • Interface dynamic or electret microphone to a line level audio input in HIFI amplifier or computer soundcard
  • Power supply: 9V battery, takes less than 10 mA current
  • No special protection circuits used
  • No special electrical safety considerations

Dimensions: 1"x1.5"x0.6"

Documents:

Pricing

In stock

2.95
2.66
2.36

186 in stock

price
10-99
100+



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images are CC BY-NC-SA 3.0

ASCII version


Comments 6 comments

  • sparker | about 2 years ago 1

    I’m pretty sure this board has a design flaw such that the inner and outer conductors of the RCA jack are shorted. I alerted SparkFun, and they are supposedly working on a fix.
    The board still works using the .1" spaced Out+ and Out- signals (don’t solder the RCA jack).
    Also, I found that it operates pretty well on Li-ion voltage.
    The BOB-08669 is smaller but amplifies high frequencies too much. This board (even at 3.7 v) has better balance.

  • GlennPowers | about 2 years ago 1

    Interesting. Why not make a “studio quality” version with the Texas Instruments INA217:
    “Fresh from a comparison test against preamps costing $200 and $1500 – which it beat handsomely – the secrets of the $5 preamp are at last revealed."
    http://www.audiomasterclass.com/arc.cfm?a=giant-killing-%245-mic-preamp-its-secrets-revealed

    • reset | about 2 years ago 1

      Hi GlennPowers, did you use a Texas Instruments INA217 together with this mic pre amp circuit board?
      thanls

  • rackm0unt | about 3 months ago 1

    Can anyone provide some advice on modifying this circuit to work with a 12V power source?