Greetings All,
I haven't posted or read any newsgroups for a long time. I am still
finishing up my house and it has been really all consuming. Anyway, I
know that there are a few folks here who have a Lincoln SP125 Plus
welder. I added a purge button to mine a while ago and it is a big
help. Saves wire and time. It would have been simple to use just a
switch to actuate the gas solenoid but the solenoid is a 125 volt unit
and I wanted to only switch low voltage. So instead I figured out how
to use the low voltage circuitry that the welder uses. I'm sure that
there is a better way but since my knowledge of electronics is so
limited it is what it is. I sent the circuit changes and the scanned
schematic to the dropbox a few minutes ago. Look for files beginning
with SP125+. After I made the changes I coated the circuit board with
epoxy in the areas where I had to remove the conformal coating. It's
important to prevent any conductive dust from shorting anything. I
hope this is useful to someone. Please feel free to tell me how it
could have been done better.
Cheers,
Eric R Snow