Carbon Mic Replacement To Magnetic Mike Converter Circuit

Carbon Microphone To Magnetic Mike MIC Converter

Carbon Microphone Replacement To Magnetic Mike Converter Circuit

A good  magnetic mic is more better then a carbon mic and easy to find nowadays.

Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one transistor carbon mic converter takes a carbon mic input and converts it to the magnetic variety. Note that no ground connection is used, even if the circuit is built in a metal cabinet. MIC is replacement type magnetic element that is substituted for the original carbon element.

Carbon Microphone To Magnetic Mike MIC Converter Circuit

R1 2.2kΩ
R2 6.8kΩ
R3 240Ω
C1 10µF
Q1 2N3394
MIC Microphone magnetic replacement element

Using miniature components the entire converter amplifier can also be housed in the original microphone case. To avoid destruction of Q1, the unit must be connected properly the first time. The “+” lead, which goes to Q1’s collector, connects to the carbon mic input that supplies a positive voltage.

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5 comments on “Carbon Mic Replacement To Magnetic Mike Converter Circuit
  1. WP Themes says:

    Genial post and this enter helped me alot in my college assignement. Thanks you for your information.

  2. Stan says:

    I can’t believe this would work, with the base bypassed to common like that. And R2 would greatly attenuate the output of the dynamic mike. Try this: Use a PNP, collector to negative, base to negative through R1, put mike between C1 negative and collector. Add a low resistance in the emitter leg to + to adjust the gain and stabilize the bias. (Select R1 for best current range.) With the same hookup, you can use an NPN if you reverse the voltage, since this is just a current modulator.

  3. It took me a long time to search on the web, only your site unfold the fully details, bookmarked and thanks again.

    – Kris

  4. FrankinFlorida says:

    I was questioning the circuit as was Stan. I was thinking, why not move the top of C1 to the junction of MC1 and R2. That would seem to take care of both problems.

  5. Frank in Florida says:

    I posted my thoughts on what Stan said but they seem to have vanished. I suggested moving the + side of C1 to the junction of R2 and MC1. That seems to make more sense, design-wise.

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