I tried posting this earlier, but I got an error message when I went to post it. So, I am not sure the first message went anywhere. If this is a double post, I apologize.
I am attempting to build a resistance soldering unit from a small car battery charger. I am following these directions:I am using a 12v 6a charger that, I think, is too small. I can just get two pieces of .005 brass sheet soldered together before the charger circuit breaker shuts off the charger. The charger will run for about 6-7 seconds. This should heat it up within 3 seconds. I would like to solder up to around .025 brass sheets together too. I found a 12/30/75 amp charger at Menards that is probably my next step. But I would like to be able to vary the current coming out. Do I need a variac for this? Does this go on the input (110v) or the output (12v) side of the charger? What specs (volts/amps/watts) should I look for on this? I also know that I could use a filament transformer of around 6.3v 6-20 amps on the secondary in place of the battery charger. Any suggestions on which is better? I KNOW that using a light dimmer switch for the adjustment setting is a bad idea.
I already know that American Beauty and PBL sells these. But for around $500 for a 250 watt model, I think I will screw around with this some more. I am bidding on a 300 watt model on ebay right now.
I also searched around the Internet for more instructions. But everything I found was pretty vague. I am electronics illiterate, but I can usually figure stuff out with some clear directions.
ANY help on this would be greatly appreciated.