>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 14 April 2005 12:20
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] Spot welder for battery terminals
>
>
>On Thu, 14 Apr 2005 09:35:04 +0100, Philip Pemberton wrote:
>
><snip>
>
>>
>>I'm using an International Rectifier 50RIA20 SCR to switch the power 
>>over, and an SGS L200CV regulator to allow the capacitor 
>voltage to be 
>>controlled. My capacitor bank consists of five Cornell-Dubilier 
>>computer-grade 120uF 25V capacitors, giving a total of 600uF, or 0.6F 
>>(the tolerance is -20/+75% though).
>>
>
>I think you've slipped a decimal place (actually three of them). 
>
>A capacicitance of 600 microfarads is 0.6 millifarads, 0.0006 F. 
>
>I hope you don't really need 0.6 F to get the unit to work. 
>Otherwise, you're going to need a lot more capacitors.

The commercial "hobby spot welder" I linked to in my fist post claims a
total capacitance of 680,000uF, so I suspect the caps that Philip is
using are 120mf.

Regards

Mike

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