Saturday, February 27, 2010


I have a couple of guys that successfully build their welders and are happy with it. However, there is a little bug that showed up. This bug is in the programming that happened in a last minute change to one line of code before starting to ship the processors out. It is more of an annoyance than anything else. By turning your voltage pot up, the set point text on the display will stop at 20Volt. If you keep on turning the potentiometer past this point your capacitor will get charged to a higher voltage and the over voltage protection will kick in and trip U5. The capacitor voltage will start to drop. To reset U5, you have to lower the voltage set point below the actual dropping capacitor voltage and raise the set point up again. If you are rebuilding battery packs and are using a car capacitor, you would never need to go that high with your voltage but for those guys that would like this bug fixed, send me an email and we can work out a way to get your processor updated. Everyone that received boards and processors after 02/15/10 will have the newest firmware already.

Monday, February 15, 2010

Manufactured PCB's

I have placed an order for the Mosfet PCB's this morning. It  had to be sent to an offshore facility because of the 3oz copper and will take about three weeks. I tried to order "OR" boards (some guys said that they will take 1 "or" 2 ) but they didn't have any :)) so I didn't get too many of the mosfet boards. I mentioned in a previous post that I got a price for a 3 layer board that would have solved the weak spot issue on the PCB but it was very expensive. This is a 2 layer board and It has 94 via's that connects the bottom and the top layer. The copper of the bottom and top layer together will be 0.0084" thick. I worked the price out to $80/board + shipping and will sell it on a first come first serve basis. 

Friday, February 12, 2010

Manufactured Mosfet PCB

I changed the Mosfet PCB to a three layer board and I got quotes to have it manufactured. The price was really high, more than $120 per board. I went back to the drawing board and redesigned the 2 layer board to make it stronger with 3oz of copper (took me 2 days). I would just like to know how many of you guys will be interested in this board? The more I buy, the less expensive they get.

Shawn's Tweezers

Thursday, February 4, 2010



Wednesday, February 3, 2010