From: firstname.lastname@example.org (N. Thornton)
Subject: Re: How to make/solder a circuit fast?
Date: 20 Sep 2002 19:40:43 -0700
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3D85221F.5D187DCE@texas.net> <email@example.com> <3D864834.firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 21 Sep 2002 02:40:43 GMT
firstname.lastname@example.org (The little lost angel) wrote in message news:<email@example.com>...
> On 19 Sep 2002 03:51:07 -0700, firstname.lastname@example.org (N. Thornton) wrote:
> >But I would worry more about a switched mode controller: that will
> >produce lots of spikes on the fan supply line that may well wipe out
> >your LEDs in 0.1 seconds. I'd try one first.
> I'm trying the prototypes on two different brands of PSU. On the
> first, it works fine for a few hours already. Will get back when I try
> the second one.
> >If the fan is fed with PWM, LED driving will be easier: R then diode
> >then capacotir then R2 then LED. Do you have a scope to find out? If
> >not you can put a piezo awd across the fan supply, through a 1k R.
> >Loud noise means PWM at af, little noise means dc supply or hf PWM.
> Would a capacitor help? Instead of so many little things?
I am guessing you mean to drive the LED if it is a PWM supply. If so
no. It would likely kill the fan supply. The bits I said are your
minimum. For 3 LEDs it'd be R, diode, cap, then one R for each LED.
But you need to know what kind of supply your fan is getting before
you do anything. You need to investigate that. If its PWM and you dont
pick it up you may have a whole lot of failures.
Re gerber files, I feel thats real OTT for 3 bucks. Youre going to go
bust if you run a comapny like that, but more to the point, here you
could waste a lot of your time on a minor job. Life has more than fan
lights to do. I would go for a relatively quick solution. A sheet of
ready made board should do, with copper pads everywhere, but no
tracks. It'll be fairly neat, but not professional looking, and it'll
be quick simple and far cheaper than getting mixed up in a cage with a