Damn new email stuff...Matt, I TRIED to cc you...
I dunno I would personally ensure that the "raw" phantom rail would be
60V or less before it "entered" the phantom regulator.
It brings back an UGLY memory of a Allen-Heath desk PSU ....maybe from
a dozen years ago...
Long story short...on that desk, the "raw" DCV was approx 30 VDC on the
"broken" un-regulated rail. Lots of blown TL0-xx chips when the PSU
pass transistor(s) shorted...and 40xx logic chips smoked.
Shrug....!
ok ok... Neve supplies USED to have things such as crowbars...as did
SSL???
Bri
Matt Syson wrote:
Hi
The HV variant is only just capable in this situation as you would
normally anticipate around 65 Volts when your 'designed' supply is fed
with mains on the high side of it's tolerance. It certainly stands a
better chance than the 'standard' 317. A useful 'dodge' could be to put
a 36 Volt 3 Watt Zener from in to out of the reg and a resistor on the
input to the reg (JLM show a 47 R but perhaps a bit larger would be
better, the normal volts drop across it will be small). Then you could
use a standard part.
Matt S
[email protected] wrote:
There is also a "HV' 317 variant rated for a 60V in/out differential:
http://www.national.com/ds/LM/LM317HV.pdf
Bri
---- Ike Zimbel <[email protected]> wrote:
I think what Matt was talking about was a TL-783
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-20687-5-ND.
best,
Ike
eliya gwetta wrote:
Hi Matt,
Yes! I remembered the LM317 not being the right regulator for 48V, a
TL583 would be a drop in replacement or I would have to change other
components in the circuit as well?
On Sat, Jul 4, 2009 at 9:25 PM, Matt Syson
<[email protected] <mailto:[email protected]>>
wrote:
Hi
The JLM circuits are pretty much what you need so you could either
'copy' the circuit and build it yourself or buy the kit.
I am not too impressed at using a LM317 for the phantom 48 rail,
they are only rated to 39 or 40 volt DIFFERENTIAL (input pin to
output pin) , meaning that if you short the output you stand a
good chance of 'blowing it up'. I presume the 47 Ohm resistor is a
lame way of trying not to 'kill' it, hardly a good engineering
solution.
You should substitute it for a TL583 (sorry this number won't come
to me, but there is a similarly packaged regulator that handles
125 Volts).
Matt S
Donald Put wrote:
If you're up to making your own, there are numerous PCBs/kits
available for this type of project. They're set up for dual
voltages and 48VDC for the phantom power. Check out JLM's
offerings on his website:
http://www.jlmaudio.com/JLM%20Power%20Supply.htm
Cheers,
--
Don
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Ike Zimbel
Zimbel Audio Productions Ltd.
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"Studio House Calls" - Repairs and upgrades to analog audio equipment
including: Amek, Allen & Heath, Neve, Neotek, MCI, Soundcraft and more.
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