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Re: A hum while on charge

Subject: Re: A hum while on charge
From: Walter Knapp <>
Date: Sun, 09 Mar 2003 10:38:44 -0500
 wrote:

> I get a hum when my Portadisc is plugged into AC and my Telinga is turned on. 
> As soon as I unplug the AC the hum goes away.
> I have no idea why it does this. Safe to say I don't do any recording with my 
> Portadisc plugged into the wall.
> Stan Tekiela
> Author / Naturalist
> Wildlife Photographer

That's exactly what I get.

Small AC power supplies like are used for this sort of thing leak AC. 
And putting enough filtering in to stop it in the Portadisc would take a 
lot of volume. I'm sure they have some filtering. It's probably getting 
into the mic through the ground side.

As Klas says, the Telinga assumes you are running portable. I've been 
using mine for years, and had never checked this until this question 
came up.

Walt





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