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  1. CDRIVE

    Small DC TIG welder remote switch needed

    Where's the Pot's pins located In that photo? I know it's near a corner of the board but which one? Upper right, lower left,....? Here's some DMM test to do. (1) While unplugged from the mains, measure the resistance from the case and each Pot pin. (2) Measure the resistance from the Hot...
  2. CDRIVE

    Small DC TIG welder remote switch needed

    We speak schematic here so this is what I'm hoping your Pot circuit looks like and how we'd modify it but it's purely speculation. Chris
  3. CDRIVE

    Small DC TIG welder remote switch needed

    Try to get a clear photo of the bottom of the board. Chris
  4. CDRIVE

    Remote Battery Issue

    Whoa! I just re-read her first post. I missed that!!! Chris
  5. CDRIVE

    EEG circuit - need help please!

    Well if there's no shield on those leads then there's nothing to ground. Obviously you can't ground pins 2 & 3. Bottom line, if the plugs on those leads indicate only single conductor IE not coaxial, then I was very wrong about them being shielded. I probably should have made a call before I...
  6. CDRIVE

    Small DC TIG welder remote switch needed

    How difficult would it be for you to pull the board that contains the Pot so we can see clear photos of both sides of the board? Needless to say make sure the unit is unplugged from the mains. Chris
  7. CDRIVE

    EEG circuit - need help please!

    I'm going to go out on a limb and say that even though EEGs employ differential inputs the leads should still be high grade, exceptionally flexible shielded cables. The shields should be tied to circuit GND at the 620 end of the cables. If anyone has any doubts about this let me know. I'm...
  8. CDRIVE

    Remote Battery Issue

    My apologies. All three are 3V with identical diameters but different thicknesses and current capacities. Yes, since your remote uses 2 the operating voltage will be 2 x 3V = 6V. If the extra thickness of the 2025 or 2032 still allows either to fit in there then you should be good to go...
  9. CDRIVE

    Small DC TIG welder remote switch needed

    Hey, I had a near accident earlier. An open bottle of Vodka fell over and nearly spilled all over my wood floor. Fortunately my lightning reflexes caught about 98% of it with my mouth. Consequently I'm having trouble keeping my eyes open. So before I sack out let me ask.. Do you own a DMM? If...
  10. CDRIVE

    Small DC TIG welder remote switch needed

    It would shut the whole thing off. OK, here's another thought. Since we don't have a schematic we're lacking a decisive point within all your low voltage circuitry (which is appreciable) to logically tap into. There is one point that is obvious though. That would be the Pot itself. Please take...
  11. CDRIVE

    Small DC TIG welder remote switch needed

    Then if the pot has an integral switch at the extreme CCW position then that's where I'd check first using a DMM. Check to see if it's switching the mains power (120VAC) or something else. If it's switching the mains (most probable) you can break one leg and insert relay contacts in series...
  12. CDRIVE

    Remote Battery Issue

    Hello Charlotte, All three, 2016, 2025 and 2032 are 3V batteries but I don't see how you're going to fit a 2025 or 2032 into a 2016 battery holder. I don't see that the fact that they're not stacked as being relevant. You have 2 side by side, which indicates they're wired in series = 6V. Chris
  13. CDRIVE

    Small DC TIG welder remote switch needed

    I don't even see an On - Off power switch on the front panel! Probably couldn't fit one in there. Damn,.. that's the quintessential definition of the "10 pounds of sh!t in a 1 pound bag" thing! The good news is there's definitely a low voltage low current control circuit in there...
  14. CDRIVE

    pir..110v or 12v?

    Oops I forgot to include Timers With Integral Relays too. ;) Chris
  15. CDRIVE

    pir..110v or 12v?

    Some Motion Detector Stuff to get you going... Chris
  16. CDRIVE

    Arduino + Relay(220V) Problem.. Need Help!

    I have a sinking feeling that his project was due today. That's unfortunate. I'm sure all of us wanted to help him and see it turned in on time. The young man's photos indicate that he does neat work too! I hope he comes back. Chris
  17. CDRIVE

    Arduino + Relay(220V) Problem.. Need Help!

    This is just supplemental to my last post regarding the ASC712. I've never used or spiced this chip but I just finished reading through the Datasheet. As per the Datasheet the Vout(Quiescent)= Vcc * .5 or rephrased.. Vout(Quiescent)= Vcc/2. When the input current (Iin) goes more positive Vout...
  18. CDRIVE

    Arduino + Relay(220V) Problem.. Need Help!

    OK, grabbing at straws here so here's a couple of thoughts. I see a 220VAC receptacle on your print but I don't see where it connects to the Mains. Since we are shooting blind here can you please disconnect the output pin of the ACS712. Then ground the Analog input of the Arduino and report if...
  19. CDRIVE

    Arduino + Relay(220V) Problem.. Need Help!

    No, the 1000uF replaces the 100uF cap. A small ~4.7uF to 10uF is connected to the 7805 output pin. See? This is why component ID's are important. ;) A Scope as in "Oscilloscope". Chris
  20. CDRIVE

    Arduino + Relay(220V) Problem.. Need Help!

    I think this confirms transients are snaking around in there or your 7805 isn't stable. Did you add a small (~4.7μF- 10μF) close to the output pin? I really like this comment. Quite frankly I wasn't certain what a "star ground" is until I read your complete reply. I've used this topology but...
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