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From: email@example.com (The little lost angel)
Subject: Re: How to make/solder a circuit fast?
Date: Thu, 26 Sep 2002 00:54:14 GMT
Organization: Yes please, I'm quite disorganized & lost at the moment
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NNTP-Posting-Date: Thu, 26 Sep 2002 00:52:54 +0000 (UTC)
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On 25 Sep 2002 15:53:51 -0700, email@example.com (N. Thornton) wrote:
>If you have a choice of wire size, thin wires in parallel will be best
Well, we did the calc before, it would take a lot of wires for the
amperage we need. Mosfets was the easier way to go. Besides we wanted
some credibility on this stuff, self wound resistors' a little shaky
on that department :D
>A resistive divider? Add tiny caps across the series Rs to bring the
>freq response to flat upto your 20MHz, ie to cancel out the effeect of
I've definitely thought of the divider, but it also means that a 50mV
spike would become a say 5mV spike or less. I'm not too sure that's
going to be discernible from the background noise on a PC by a sound
And wouldn't capacitors smooth out everything and gives me what
appears to be a nice waveforum while in reality the SMPS could be crap
and fluctuating all the way?
>Another option is to use a capacitor. That'll give you the ac noise
>component unreduced, without the 12v dc present. Add diodes to clamp
>the signal to within a safe range, and a series R to limit i during
>clamping action. Use a flat plate ceramic across the main capacitor,
>as caps dont always behave well at 20MHz. Ceramic plate caps are non
>inductive, they are not wound like most other types.
Is the AC noise important? I was more like focused on whether the DC
output was stable and free of distortion etc as the DC's what usually
causes the PC to have random problems.
>Will that do it?
>Did your high current measuring work out btw?
I got the shunts and they work... as long as I've got the money to buy
another few Flukes since the cheapo DVM can't read mV accurately.
I'm still trying to solve the problem of reading 1mV to 100mV
accurately and cheaply :P
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