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 Post subject: Uknown Mic element - NOW KNOWN thank you
PostPosted: Sep Wed 11, 2019 9:25 pm 
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Location: 08033 Cherry Hill Jersey
Hi,
Does anyone know what make and type of elements these are? THey have pretty good gain when connected to a scope w/o any bias, and I may want to use them as replacements.

They have a heavy magnet and made in Canada.
Help appreciated.
cheers
jeffrey

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Last edited by SmoothOscillator on Sep Thu 12, 2019 12:31 am, edited 2 times in total.

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 Post subject: Re: Uknown Mic element
PostPosted: Sep Wed 11, 2019 9:38 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Cape Breton Island Canada
Northern Electric telephone

http://www.paul-f.com/neUNI.html

Ken


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 Post subject: Re: Uknown Mic element
PostPosted: Sep Wed 11, 2019 10:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Seattle WA US
Looks like a licensed copy of a common Western Electric receiver element, as used in the WE model 302 telephone. Could be used as a low impedance magnetic microphone , if you want. (Microphone elements used in the same telephone were carbon microphones.)

-Chuck


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 Post subject: Re: Uknown Mic element
PostPosted: Sep Thu 12, 2019 12:29 am 
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THANKS GENTS

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 Post subject: Re: Uknown Mic element - NOW KNOWN thank you
PostPosted: Sep Thu 12, 2019 2:53 am 
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Location: Ohio 45177
If we don't know what the impedance is, what is the DC resistance? That could clue you what range the impedance might be. If it is pretty low, you would need a stepup of some sort for alot of uses.

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 Post subject: Re: Uknown Mic element - NOW KNOWN thank you
PostPosted: Sep Thu 12, 2019 1:18 pm 
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Location: Fernandina Beach, FL
It is no doubt as described above, a carbon mike. But I don't know the impedance of them.

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 Post subject: Re: Uknown Mic element - NOW KNOWN thank you
PostPosted: Sep Thu 12, 2019 2:37 pm 
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No, it is NOT a carbon mike. It is a permanent magnet receiver (speaker) unit. I would guess impedance around 125 ohms, but have not checked. Carbon mikes were used as transmitters in the same handset.
-Chuck


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 Post subject: Re: Uknown Mic element - NOW KNOWN thank you
PostPosted: Sep Thu 12, 2019 3:29 pm 
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Location: Fernandina Beach, FL
K7MCG wrote:
No, it is NOT a carbon mike. It is a permanent magnet receiver (speaker) unit. I would guess impedance around 125 ohms, but have not checked. Carbon mikes were used as transmitters in the same handset.
-Chuck

Chuck, you are absolutely correct. I was "looking at the wrong end of the handset!" Didn't have the coffee yet.

My apologies if I cornfused anyone!

And heck, I worked for the "Phone Company" for 31 years!

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