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Where to by a dynamic mic

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zerodegreec

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Looking for source to buy some dynamic mics. All I find on Mouser and the like are Electret mics. I am not looking for a stage mic, just the component. What am I doing wrong in my search?
 

They are hard to find. The manufacturers show up but seem to be aligned to sell to OEMs only. You can get a complete dynamic microphone for less than $10. The Nady SP-1 and similar products from Sony and Audio-Technica are widely available. Most of the wired microphones made for old cassette recorders and kids karaoke machines are dynamics so you might do well at a thrift store.

**broken link removed**

Sony FV100 Omni-Directional Dynamic Microphone : Microphones | RadioShack.com
RadioShack Universal Cassette Recorder Microphone : Microphones & accessories | RadioShack.com

**broken link removed**
 
If you don't need hi-fi then you can use a speaker or headphone element.

It's practically the same thing as a dynamic mic. A coil close to a magnet.

However the mic resistance is 100 to 1000 ohms, whereas speaker impedance is typically 4 to 50 ohms.

The amplifier circuit will be different. Here's a sample.

www3.telus.net/chemelec/Projects/Spkr-Mic/Spkr-mic.htm

A search should turn up schematics using an op amp, if that would be preferable.
 

Thank you very much aduiomik exactly what I am looking for.
 

After your thread with problems with Electret capsules, am guessing this might be for your Rally Car helmets;-)

If you still get instability/feedback problems, double check that you have the common return (ground) wire connected correctly as in your diagram in the other thread.
Also there is a possibility of acoustic feedback when the helmet is not being worn as there won't be much to stop the microphone picking up the earpieces.

good luck
Mik
 

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