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Upgrading a Telex 253 Paging Desk Mic [message #3203] Wed, 20 January 2016 19:34 Go to next message
K2GOG is currently offline  K2GOG
Messages: 12
Registered: January 2016
Location: FN31re
Junior Member
index.php?t=getfile&id=81&private=0For $5, picked up a Telex 253 mic a while back at a ham fest.

This is a common mic and the design is the same some of the Turner microphones some may remember from the "CB Days".

The main difference is the Telex 253 is low impedance dynamic element and can not drive many newer radios without the addition of a transformer, pre-amp, maybe even both...

What I did after giving the mic a new paint job to cover up the beige tone was to integrate in a preamp but, could not design one dead bug style to fit nice in the base, neck or head of the mic.

So after one attempt, i figured for a few dollars, off to the internet I went and after finding some options on E-Bay in kit form (and long shipment wait times)

Found this one over at Adafruit.

https://www.adafruit.com/products/1063?gclid=CIOmicPRucoCFQo tHwodKlMATg


Also sold at Newark and a bunch of other places.

If you are looking for a really hot (audio wise) preamp this may be worth picking one up for other projects.







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[Updated on: Wed, 20 January 2016 19:44]

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Re: Upgrading a Telex 253 Paging Desk Mic [message #3204 is a reply to message #3203] Wed, 20 January 2016 19:40 Go to previous messageGo to next message
K2GOG is currently offline  K2GOG
Messages: 12
Registered: January 2016
Location: FN31re
Junior Member
I decided to try the element built in, so used a 100 ohm resistor to drop from 8V put out by the radio I will use this with to be within the operating voltage the preamp was looking for

Easy 3 wire hook up. I had to totally rewire the Telex mic though to get it working though.

Just a little preamp needed to get it sounding ok. Much less than I thought it would need.


http://s8.postimg.org/efi1rkpok/IMG_20160120_192626.jpg



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K2GOG at Yahoo. That is where.
Re: Upgrading a Telex 253 Paging Desk Mic [message #3205 is a reply to message #3203] Wed, 20 January 2016 19:43 Go to previous message
K2GOG is currently offline  K2GOG
Messages: 12
Registered: January 2016
Location: FN31re
Junior Member
hammertone finish. all done

http://s8.postimg.org/i1nv47w1x/IMG_20160120_192801.jpg


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