I'm trying to build a resistance soldering unit using a filament Xfmr with 120V input and 6.5V 20A secondary. Any suggestions as to how I should regulate the input voltage so as to have variable output?(Without,hopefully, having to purchase a large VARIAC!) The input regulator will need to sustain the large current draw with no "'splosions"!
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Some low voltage halogen lamps are powered by a transformer - a real transformer, not an SMPS - and some dimmers exist to control them. May be the best buy. Ordinairy incandescent dimmers won't work for long. Designing something to control the primary is not that easy, allthough it can be done off course. But maybe someone has a good design.
You can controll the secondary, but you will loose some voltage and 6.5V is not that much.
petrus bitbyter
Input current is about an amp. That's not a very large VARIAC!. mike
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Input current is about an amp. That's not a very large VARIAC!. mike
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A couple lamp sockets wired in parallel and that in series with the primary should be enough of a current limit, once you select the right wattage bulbs to put in them. I think a 40 watt and a 75 watt would give 3 useful combinations. And you get a nice visual indication that a connection is made. ;-)
-- John Popelish
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