[sdiy] getting started

[Tim Ressel]

John and all,

Well, the answer is (drum roll, please): UL sez its
high voltage!  The rest of your product can run on
3.3V, but if you put a modem in there ... SHAZAM! The
low-voltage directive no longer applies. If fact,
rumor has it that the 42.4V number was picked in part
because its lower that the 48V Battery Voltage
standard of US telecom.

Believe me: Been there, done that, didn't even get a
stinkin t-shirt.

--TR



--- John L Marshall <john.l.marshall at gte.net> wrote:
> but, but, but.... telephone circuits are 48 volts
> with 90 volts AC, 20 Hz
> for ringing. The source impedance is relatively
> high. What is the UL opinion
> on that?
> 
> Take care,
> John
>
---------------------------------------------------------------------------
> Pacific Northwest DIY Synthesizer meeting, January
> 18, 2003
> See: www.sound-photo.com
>
---------------------------------------------------------------------------
> 
> ----- Original Message -----
> From: "Tim Ressel" <madhun2001 at yahoo.com>
> To: "patchell" <patchell at silcom.com>; "Pot Synth"
> <pot_synth at yahoo.co.uk>
> Cc: <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, October 22, 2002 5:01 PM
> Subject: Re: [sdiy] getting started
> 
> 
> > Yo,
> >
> > According to UL, anything 40.4V or above is high
> > voltage.
> >
> > --TR
> 


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