From: John Fields
Organization: Austin Instruments,Inc.
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Subject: Re: How to make/solder a circuit fast?
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Sun, 15 Sep 2002 19:12:04 CDT
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Date: Mon, 16 Sep 2002 00:12:04 GMT
The little lost angel wrote:
> On 15 Sep 2002 07:36:38 -0700, firstname.lastname@example.org (N. Thornton) wrote:
> >OK, I understand your temp figure now. But pushing a little reg to its
> >specification limits in a project like this is not an issue to be
> >honest. As someone rightly said, when youre doing home experimenting
> >you can push things further than a comercial house would.
> Hee, since it's the lifeblood of the entire PC systems, I'd like to do
> things right. At least if the PSU blows, I know it wasn't my fault and
> I did do my best to make sure what I made would had survived under
> those operating conditions.
> >There must be ways to connect it that would be safe and secure. It'd
> If it was me doing just one piece, I could conceivably solder
> the input lead to the mess of the +12V output lead. But I'm just
> making the board with connectors, them guys have the joy of opening up
> their own PSU, sticking their chosen LED colours into the widget and
> sticknig the entire widget into the PSU.
> I don't wanna get blamed when one of them takes out the
> capacitors and mosfet with a badly wielded solder iron.
> >make life far easier. BTW why is the 12v out supply any more
> >vulnerable than the fan supply? If anything I would think it is better
> The fan supply, at least for the couple I've opened up, is on
> a separate PCB that's connected the main PCB via a regulator
> (thermal?). The IC, it looks like a TO-220 but much smaller sticks two
> ends into the main PCB, is secured to the small PCB.
> The small PCB has two small 2-pin socket for the fans. So it's
> easier to simply detach one of the fan from the socket, attach the
> widget, attach the fan to the widget in a parallel connection.
> If anything goes wrong and they need to RMA the PSU,
> everything can be restored by removing the widget and putting the fan
> back onto the PCB.
Please DON'T, under ANY circumstances, use any of the circuits I posted
in this thread.
As I understood it, the 6~12V supply was a real voltage source, not the
output of some device used to control the fan speed.
Since we don't really know _what_ the motor driver looks like, there's
no telling what might happen if you throw another 60mA load across the
fan, so COUNT ME OUT!
Professional circuit designer