[Amps] AC to DC

[Gary Schafer]

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Bill Turner
> Sent: Saturday, January 28, 2006 11:17 PM
> To: Rich; Amps
> Subject: Re: [Amps] AC to DC
> 
> ORIGINAL MESSAGE:
> 
> At 07:43 PM 1/28/2006, Rich wrote:
> 
> >It this a feasible idea to use DC to reduce the chance of
> >hum being induced and what DC voltage should I use?
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> I wish I could remember exactly, but years ago I heard some advice
> against using DC on AC relays. It had to do with the core getting
> magnetized or something like that, which delayed dropout when power
> was removed.
> 
> Best to use a relay designed for the purpose.
> 
> 73, Bill W6WRT

A DC relay is wound with enough resistance to withstand the applied voltage.
An AC relay depends partly on the inductance presented by the coil for its
impedance to AC. That same coil on DC may not have enough resistance and may
overheat.

73
Gary K4FMX