Keep in mind that nickel tabs have a high resistance, so the whole
process is somewhat "tuned". This product might not work well with
other tab thicknesses, for example. 

They charge $320 to get back the awesome amount of time they spent
tinkering with it to make it work right.

--Bob

Michael Rigby-Jones wrote:

>>-----Original Message-----
>>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>>On Behalf Of Lawrence Lile
>>Sent: 20 October 2004 13:49
>>To: Microcontroller discussion list - Public.
>>Subject: RE: [EE]: Battery Spot welding...
>>
>>
>>That is really interesting. 
>>
>>http://www.hobbyspotwelders.com/HS300A2.php
>>
>>    
>>
>
>I'd be dissapointed to have made something that badly for my own use, let
>alone to sell on a comercial basis!.  Just look at the grid of holes drilled
>for ventilation!
>
>680,000uF is a fair bit though, I guess they are using an SCR to fire the
>capacitor bank.
>
>Mike
>
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