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Recommend me low-voltage dynamic microphone preamp circuit?

Can anyone recommend me low-voltage dynamic microphone preamp circuit similar to this one for ECM http://www.analog.com/en/products/amplifiers/operational-amplifiers/high-voltage-op-amps-greaterthanequalto-12v/lt1677.html#product-overview ???

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  • Hi Joven,

    So many thanks for your prompt, kind and very interesting feedback and

    nice to meet you!

    Your e-mail addresses look strange but hopefully my reply is being

    delivered properly to one of the e-addresses.

    My name is Misha, I am steel-string acoustic guitar player living in

    Tbilisi, Republic of Georgia (former USSR), and I looking for the

    quality dynamic mic (low-impedance 100-200 Ohm) preamp circuits to

    build and have it installed in the body of the new acoustic guitar

    ....

    In other instruments I do use electret condenser mics (miniature

    Oktava) wired to the guitar's on-board B-Band preamp system which I

    will NOT have available for the new instrument, so I have to build it

    myself and install in the guitar. ECM mics are most commonly used for

    acoustic guitar pickup systems, but now, due to the potential

    characteristics and less-prone to feedback, I am experimenting with

    little dynamic mic capsules and really got some success; these are

    100-200 Ohm capsules taken from quality earphones and they really work

    as good microphones, however with lower sensitivity comparing to ECM

    mics ......   I got this idea from Swiss company Schertler who

    produces moving-coil pickup systems with the similar impedance of

    200-300 Ohm, I find this technology of mics and ear-phone capsules

    almost the same using magnets and coils, I am sure this will

    definitely work just great.....

    So I am searching for some little preamp (PRE-PREAMP would sound more

    equally!) section based on 1-2 transistors or one OP-amp and having

    low-voltage powering of 3-4.5V (for easier installation in the

    guitar's body), the major requirements are the following:

    1. To preamplify signal from 0.5-1 mV to 10-15 mV

    2. To be designed for low-impedance dynamic mic inputs

    3. To having minimal number of other semi-conductors in the circuit

    4. To be ready-to-go, all the way tested and completed requiring no

    more experimentation with nominals of other semi-conductors.....

    In similar situations (compactly mounted internally in the guitar),

    some manufacturers do use couple of FET transistors, do you think that

    transistors might be any better of Op-amps in regards or self-noise,

    distortion and amplification ??

    If the higher voltage of up to 9V might be considered as a must for

    better results, then I would move to that circuit options.

    Sorry for such a large letter but otherwise it would not have the

    situation described and covered fully.

    Thank you for your time and consideration!

    With kindest regards,

    Misha

Reply
  • Hi Joven,

    So many thanks for your prompt, kind and very interesting feedback and

    nice to meet you!

    Your e-mail addresses look strange but hopefully my reply is being

    delivered properly to one of the e-addresses.

    My name is Misha, I am steel-string acoustic guitar player living in

    Tbilisi, Republic of Georgia (former USSR), and I looking for the

    quality dynamic mic (low-impedance 100-200 Ohm) preamp circuits to

    build and have it installed in the body of the new acoustic guitar

    ....

    In other instruments I do use electret condenser mics (miniature

    Oktava) wired to the guitar's on-board B-Band preamp system which I

    will NOT have available for the new instrument, so I have to build it

    myself and install in the guitar. ECM mics are most commonly used for

    acoustic guitar pickup systems, but now, due to the potential

    characteristics and less-prone to feedback, I am experimenting with

    little dynamic mic capsules and really got some success; these are

    100-200 Ohm capsules taken from quality earphones and they really work

    as good microphones, however with lower sensitivity comparing to ECM

    mics ......   I got this idea from Swiss company Schertler who

    produces moving-coil pickup systems with the similar impedance of

    200-300 Ohm, I find this technology of mics and ear-phone capsules

    almost the same using magnets and coils, I am sure this will

    definitely work just great.....

    So I am searching for some little preamp (PRE-PREAMP would sound more

    equally!) section based on 1-2 transistors or one OP-amp and having

    low-voltage powering of 3-4.5V (for easier installation in the

    guitar's body), the major requirements are the following:

    1. To preamplify signal from 0.5-1 mV to 10-15 mV

    2. To be designed for low-impedance dynamic mic inputs

    3. To having minimal number of other semi-conductors in the circuit

    4. To be ready-to-go, all the way tested and completed requiring no

    more experimentation with nominals of other semi-conductors.....

    In similar situations (compactly mounted internally in the guitar),

    some manufacturers do use couple of FET transistors, do you think that

    transistors might be any better of Op-amps in regards or self-noise,

    distortion and amplification ??

    If the higher voltage of up to 9V might be considered as a must for

    better results, then I would move to that circuit options.

    Sorry for such a large letter but otherwise it would not have the

    situation described and covered fully.

    Thank you for your time and consideration!

    With kindest regards,

    Misha

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