Need Help Finding this Mic

[NBD925]

I need help identifying this soldered on Mic. I thought there would be some identifying numbers on it but have not seen anything yet. I believe this Mic is bad and putting out a low transmission. Any thoughts on a suitable replacement I could solder in??

 

[Lightium]

Believing ain't knowing. Did you test the mic for spectral response?

 

[NBD925]

I have not done that test but did test the circuit in a different way. The Radio this mic is in also has a Mic jack and with a mic plugged into the jack it worked perfect. So it eliminated the preamp and narrowed it down to likely a bad Mic.

Here is the thread that has been going for a while now. I have limited experience and equipment but im willing to learn and try.

https://www.electro-tech-online.com/threads/snowmobile-2-way-radio-low-transmission.165970/

 

[NBD925]

It looks like a two pin condenser Mic but could have a heat shrink cover on it or something. Its from a snowmobile handheld radio so may be a form of water or moisture protection.

 

[Lightium]

Yes, it's a moisture protective cover. When was the last time it got wet?

 

[Lightium]

What model of amp ic? What voltage powers the device?

 

[NBD925]

Its possible that is what made it fail. The radio had normal slits or holes in the face for your voice to enter like a speaker and the company came up with a Frog Skin material to go over those holes to keep moisture and snow out of that microphone area. That could have been why this Mic failed.

I can measure the microphone for diameter and height and get close there but what would be the best way to measure the other variables to get the exact model?? Impedance requires a special machine.

https://www.digikey.com/en/products/detail/pui-audio-inc/AOW-4542P-B-R/3189922

 

[Lightium]

I would look for the datasheet of the amplifier. In the meantime I've been looking here:https://www.digikey.com/en/products...+IqUgUqAJnoA2KhCJ1Zs+NY+7vQe7nognNx8QmKSEhJAA

 

[Lightium]

You don't need to test the mic. You need the datasheet of the amplifier of the mic.

 

[NBD925]

Im not experienced enough to identify the amplifier or Pre Amp. Is it near the purple arrow in the picture? Your thinking being the Amp specs will dictate what Mic you could have?

 

[Lightium]

Yes, the purple arrow directs to the chip. Can you read what is printed on it?

 

[NBD925]

I will have to look for a better picture. If I dont come up with that tonight, I should be able to get a good picture tomorrow. I am away from my house tonight.

 

[Lightium]

okay.

 

[ZipZapOuch]

Slip the rubber sleeve off of the mic, you should find some model numbers on the side of the cylinder.

 

[rjenkinsgb]

Just get one that's physically similar and try it!

It's voice communications, not HiFi audio - the exact details of frequency response etc. are pretty much irrelevant.

 

[NBD925]

Right on. Ill gather some more info today.

 

[Lightium]

I am sure almost any mic will do, but let's not "just cram something in and call it a day".

 

[ZipZapOuch]

I am sure almost any mic will do, but let's not "just cram something in and call it a day".

I would try cramming something in to get a first approximation if I don't find the model number or driver info in a few minutes. Iterative development works surprisingly well (and it can be a really a fast way to solve a problem).