I need a part # of a SCR to use these 10 Computer caps 220000 uf @ 10 volts

sam_sam_sam

I want to make a cap discharge spot welder but I need a SCR that will handle about 125 amp or more and be able to control it with a Basic Stamp. Here is the story about this spot welder I bought on EBay It came to the house and I pug it in wall the battery charger worked the welder controller would work but did not put power to the welding transformer because two pins on the SCR where broken loose on the control board repair that and now it burn the wire at the plug off so I got some 3 wire so cord 14 gauge and a 20 amp plug and try to run the welder again now I tripped a 15 amp breaker so I put a 20 amp breaker and tripped that one as well So I send the EBay seller an email telling them the problems that I was having with this welder So they send me a new transformer with the Probe arm and a new SCR with a heat sink and this transformer tripped the breaker as well so I took both transformer and hook them in series And # 8 battery cable on the secondary and now I can melt wire and not trip the breaker so now I have an extra set of probes to make a cap discharge spot welder I would not send back this welder because it would about $ 100.00 to ship it back to China I will hope fully will get this weld to work now I bought the computer caps on EBay 6 @ $7.00 each and 4 @ $ 8.75 each

Peter KG6LSE

Just find a Hocky Puck style SCR ...... I have one on my desk here
a ge 104X125DA089 1000A 1000V ish rated SCR slated for my Coil gun.

I recon just use the RC TC law and find the max current . then see if that peak is X amount of amps ......... Find a SCR with that rating ....

Let me do some digging .


if you just need 100 A or so a Stud based one is plenty .


Frankly a MOSFET could also handle it too . 100 amps is not that much really


http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRF7739L1TRPBF


I have some 190A ones here that where lke 3 bucks each .
and with FETs you can controll them .......
just switch them hard and FAST!

get a gate driver . LM 5114 is one ..

sam_sam_sam

Peter KG6LSE wrote: »

Just find a Hocky Puck style SCR ...... http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRF7739L1TRPBF


I have some 190A ones here that where lke 3 bucks each .
and with FETs you can controll them .......
just switch them hard and FAST!

get a gate driver . LM 5114 is one ..

What about this one




568-7513-5-ND

MOSFET N-CH 40V TO220AB




Thank you for your reply