Is preamp necessary to use this mic with a chipamp? - diyAudio
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Old 13th June 2013, 02:10 AM   #1
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Default Is preamp necessary to use this mic with a chipamp?

I would like to use the following microphone with a BrianGT chipamp, or a Pyle amp, or perhaps another inexpensive solid state amp.

I have chosen this mike because I understand it to be a good choice for use with a harmonica, specs a follows:

Ceramic/Crystal NOS Microphone Element/Capsule Harmonica, Harp, Mic, Hi Z, Blues. These Elements use the same old school technology as the original crystal microphones from the 50's and are sourced from Japan. They are High Impedance so no Audio Transformer is needed.
.
Technical data Sensitivity -60 dB
Frequency range 300 - 10 000 Hz
Dimensions ( x H) 31 mm x 9 mm
Impedance 200 kΩ

Is the mic compatible, or can it be made compatible with a preamp?
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Old 13th June 2013, 12:55 PM   #2
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What are the issues relative to matching input impedance, and line in voltage levels?
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Old 13th June 2013, 01:17 PM   #3
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Quote:
Originally Posted by skyler View Post
I would like to use the following microphone with a BrianGT chipamp, or a Pyle amp, or perhaps another inexpensive solid state amp.

I have chosen this mike because I understand it to be a good choice for use with a harmonica, specs a follows:

Ceramic/Crystal NOS Microphone Element/Capsule Harmonica, Harp, Mic, Hi Z, Blues. These Elements use the same old school technology as the original crystal microphones from the 50's and are sourced from Japan. They are High Impedance so no Audio Transformer is needed.


Technical data Sensitivity -60 dB
Frequency range 300 - 10 000 Hz
Dimensions ( x H) 31 mm x 9 mm
Impedance 200 kΩ

Is the mic compatible, or can it be made compatible with a preamp?
Yes you'll need a mic to line preamp, there a lot of them on the bay 9V battery powered .and most of them will work fine , or go to your local music shop .

Cheers ,

Rens
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Old 13th June 2013, 05:09 PM   #4
Minion is offline Minion  Canada
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A regular Mic preamp probably won't be suitable because of the Mics 200k ohm impedance , Most mic preamps have about 2k-5k ohm input impedance .....

Many old Hi-Z mics were unbalanced so you could simply build a Gain Stage or two using opamps and set the input impedance to 1-2 mega ohms ....

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Old 13th June 2013, 05:31 PM   #5
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Would this preamp be ok at 50k ohm impedance?

Kemo M040N Preamplifier Module

The Kemo M040N is an ideal way to add a 40 dB boost to a relatively weak audio source, such as a microphone, when inserted between the source and a power amplifier. Installation is made easy with the attached wire leads.
Specifications: • Operating voltage: 9 - 24 VDC • Frequency response: 20 - 20,000 Hz • Input voltage: 2 - 50 mV • Output: 0.2 - 5 V • Input impedance: 50 kΩ • Output impedance: < 1 kΩ • Amplification: 40 dB 10% • Distortion: < 0.02% • Current consumption: < 2 mA • Dimensions: 1.18" x 0.98" x 0.59" (without mounting straps)


Or this one:
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.

Last edited by skyler; 13th June 2013 at 05:36 PM.
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Old 14th June 2013, 12:02 PM   #6
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
You have still not established what that 200k refers to.
Is it the output impedance of the mic?
or,
Is it the recommended load impedance presented by the amplifier?
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