Here is the schematic for SCR control of my arc welder

**Silverback** · 04-02-2004, 11:14 PM

Heh… I think I'm going to rig a microswitch on the back of my pedal to open the valve as soon as I start putting my foot down. It should be easy enough to build a post flow delay into the circuit…

**bruski36** · 10-03-2004, 09:41 PM

Were are You Getting your Parts From...........I can not find the SCR GE 8493622......................Is there any special place you get every thing else...........I have a foot pedal but have to build the rest.....thanks Bruski36

**Mike W** · 10-04-2004, 01:09 PM

http://www.digikey.com/ is a good parts place.

**morpheus** · 10-05-2004, 10:36 AM

I got my SCR's from the www.surpluscenter.com for about $16 each I think it was. It looks like they're sold out of them now ...

**bruski36** · 10-05-2004, 03:10 PM

Thanks Mike W & Morpheus........

I found these 2N1792 110amps 700volts rms SCR

Do you know if these will work?

One more Question......R4 250k 40% potentiometer ( whats the 40% for)?

Thanks Bruski36

**Timinmb** · 10-05-2004, 04:22 PM

Originally Posted by bruski36

Thanks Mike W & Morpheus........

I found these 2N1792 110amps 700volts rms SCR

Do you know if these will work?

One more Question......R4 250k 40% potentiometer ( whats the 40% for)?

Thanks Bruski36

Those SCR's sound good for this application. Can you get them cheap? As for R4, I used a 1 Meg ohm potentiometer because I couldn't get full on to off with the 1/3 to 1/2 travel my foot pedal was moving it through. Don't worry about the 40%, not sure what that was all about. It needs to be linear taper (not audio), and doesn't need to be very high wattage. It handles very little current.

**burford** · 10-10-2006, 10:36 AM

Originally Posted by bruski36

Were are You Getting your Parts From...........I can not find the SCR GE 8493622......................Is there any special place you get every thing else...........I have a foot pedal but have to build the rest.....thanks Bruski36

Can anyone help me with a data sheet for the SCR GE 8493622 ? Or who made them.
I have two of them and can get more of them.

**scruff** · 10-11-2007, 10:00 PM

I know this thread is a year old or more, but did you ever get this unit working bruski36 ?

Anone actively using one of these ?

**tanky321** · 10-12-2007, 08:00 AM

I actually built the circuit a while back, I havnet put it to use yet though. Heres some pics of the board I built.

**scruff** · 10-12-2007, 08:09 AM

Tanky, I get a lot of pictures blocked here at work, do you think you could email that one directly ? stragedy AT gmail DOT com .

If you're not using it, you wanna sell it ?

**tanky321** · 10-12-2007, 08:40 AM

I sent the pics, and im not planning on selling it, but if anyone wants I could etch a board for them.

**scruff** · 10-12-2007, 10:11 AM

Your board looks great, nice thick traces, good layout.
I like the BioHazard symbols too.
From that as a starting point I probably wouldn't feel too bad about assembling it myself.

What did the total of the parts come to ?

**tanky321** · 10-12-2007, 10:36 AM

I have about $15 in parts for the board, not including the board itself or etching supplies.

The pot was about $10.

Everything was from www.mouser.com

**ohmthis** · 10-23-2007, 12:54 AM

I built one of these last year and it didn't work right on my welder. I need to get back at it and try to figure out what went wrong. If anyone out there can give some help please reply, Thanks!!! ohm

**scruff** · 10-23-2007, 06:21 AM

Maybe you could post a picture of the circuit you ended up using and how you wired it, and them more knowledgeable on here can pick it apart, see what you did wrong ?

Hobart Welders

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