[Milsurplus] [ARC5] Carbon mic pops

[hwhall at compuserve.com]

All the caps were replaced before we powered up. The "battery" DC power supply is quiet, no hum with the PTT held down. Just a loud pop when the PTT contacts close.
 

 Wayne

 

-----Original Message-----
From: J Mcvey <ac2eu at yahoo.com>
To: hwhall <hwhall at compuserve.com>; arc5 <arc5 at mailman.qth.net>; milsurplus <milsurplus at mailman.qth.net>
Sent: Mon, Nov 28, 2016 8:03 pm
Subject: Re: [ARC5] Carbon mic pops



My guess is that you have an open cap in the Mic DC filter circuit. 

 



 
 
 
 On Monday, November 28, 2016 9:53 PM, "hwhall at compuserve.com" <hwhall at compuserve.com> wrote:

  

 
I have a question about use of carbon mics in circuits like interphones. Mics like the T-17 leave the mic "battery" current circuit open until the PTT is pressed to speak. But the contact closure creates a huge pop in the headphones attached to the amp output. Does anyone know how this was dealt with or did they just live with the earsplitting pops??

Wayne
WB4OGM


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