[ARC5] Make that Old T-17 Work with BC-456

[Scott Johnson]

There are plenty of electret capsules out there that have a follower off the FET preamp that will drive a carbon input. I have had good luck with the three terminal capsules I have salvaged from computer mics, Sometimes a voltage dropping network is needed prevent overvoltage (DC) to the element.  Most are limited to 5-8 VDC.

 

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From: Doran Platt <jeepp2 at comcast.net> 
Sent: None
To: scottjohnson1 at cox.net; arc5 at ix.netcom.com; arc5 at mailman.qth.net
Subject: Re: [ARC5] Make that Old T-17 Work with BC-456

 

I believe electret/carbon compatible mics all have an appropriate amplifier associated with it.
K3HVG Jeep


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-----Original Message-----

From: scottjohnson1 at cox.net <mailto:scottjohnson1 at cox.net> 
To: arc5 at ix.netcom.com <mailto:arc5 at ix.netcom.com> , arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> 
Sent: 2020-04-02 2:15:09 PM 
Subject: Re: [ARC5] Make that Old T-17 Work with BC-456

Why not just install a 50 cent electret cartridge in the T-17, and call it a day?  (you’ll have the finest sounding T-17 around!)

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From:  <mailto:arc5-bounces at mailman.qth.net> arc5-bounces at mailman.qth.net < <mailto:arc5-bounces at mailman.qth.net> arc5-bounces at mailman.qth.net> On Behalf Of David Stinson
Sent: Thursday, April 2, 2020 11:00 AM
To: ARC-5 < <mailto:arc5 at mailman.qth.net> arc5 at mailman.qth.net>
Subject: [ARC5] Make that Old T-17 Work with BC-456

 

Got a BC-456 modulator you want to use, but only "dud" T-17 mikes?  Yes; in a perfect world, we'd wait and search until we found a "good" T-17.   This world ain't perfect.  I don't know about you, but the sand in my hour glass is getting a little low, and given the current world situation,  I'd kinda like to enjoy my gear before "Ol' Grim" comes to collect me.  

So if you're T-17 will so even 10% mod, here's a non-destructive way to change two resistors and get your BC-456 modulator singing for you:



 


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