6 Jul
1999
6 Jul
'99
8:56 p.m.
Hi Gang:
This is a longshot, but I am looking for a schematic (or even a pinout)
for an LH Research power supply, model number IM203. It's 120VAC to 5
VDC@8A, 12 VDC and -12 VDC both at 1.5A.
There are two terminal strips (unlabelled) on the supply, one with 4
screws (AC input, by inspection), and one with 7 screws for the outputs.
It's not working (nothing obvious like rectifier or fuses) and I'm trying
to figure out why. I emailed the company without a reply.
Any info appreciated,
Kevin
--
Kevin McQuiggin VE7ZD
mcquiggi(a)sfu.ca
6 Jul
6 Jul
9:14 p.m.
Kevin McQuiggin <mcquiggi(a)sfu.ca> wrote:
Hi Gang:
This is a longshot, but I am looking for a schematic (or even a pinout)
for an LH Research power supply, model number IM203. It's 120VAC to 5
VDC@8A, 12 VDC and -12 VDC both at 1.5A.
Hi
I don't know the particular supply you are looking at. The first
thing to determine is if it is an analog or switcher.
This is most easily determined by the ratio of transformer space
to electrolytics. One big transformer and only a couple of large
electrolytics and it is analog. Small transformer and a lot
of electrolytics ( some rated for high voltage ) and it is a
switcher.
Where you go from here is related to what you have.
Dwight
5:35 p.m.
Date: Tue, 6 Jul 1999 19:14:21 -0700 (PDT)
Reply-to: classiccmp(a)u.washington.edu
From: Dwight Elvey <elvey(a)hal.com>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: Need Info: "LH Research" Power Supply
Kevin McQuiggin <mcquiggi(a)sfu.ca> wrote:
Be careful, I have seen switchers that looks almost like analog per
your descriptions and few analog ones looks like complex switcher.
Switchers: Only talltale item: solid ferrite core and small, tends
to have copper band; switcher. Analog PSU tend to have soft iron
lamites and bit heavy and tend to hum like a bee sometimes.
Switchers sometimes squeal and usually quiet.
Wizard
Hi Gang:
This is a longshot, but I am looking for a schematic (or even a pinout)
for an LH Research power supply, model number IM203. It's 120VAC to 5
VDC@8A, 12 VDC and -12 VDC both at 1.5A.
Hi
I don't know the particular supply you are looking at. The first
thing to determine is if it is an analog or switcher.
This is most easily determined by the ratio of transformer space
to electrolytics. One big transformer and only a couple of large
electrolytics and it is analog. Small transformer and a lot
of electrolytics ( some rated for high voltage ) and it is a
switcher.
Where you go from here is related to what you have.
Dwight
9:44 p.m.
jpero(a)cgocable.net wrote:
Be careful, I have seen switchers that looks almost like analog per
your descriptions and few analog ones looks like complex switcher.
Switchers: Only talltale item: solid ferrite core and small, tends
to have copper band; switcher. Analog PSU tend to have soft iron
lamites and bit heavy and tend to hum like a bee sometimes.
Switchers sometimes squeal and usually quiet.
Wizard
All true but low voltage outputs rarely have 350-450V electrolytics
hanging on them.
Dwight
7 Jul
7 Jul
2:38 p.m.
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ard＠p850ug1.demon.co.uk -
elvey＠hal.com -
jpero＠cgocable.net -
mcquiggi＠sfu.ca