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  1. CDRIVE

    Chronograph for bullets

    Schematic is the language we speak. Without it we only interpret what you're asking.
  2. CDRIVE

    Digital Pot setup

    Aren't you already using a 7805? That number is just another variant of the same. Vin Max is 30V so you'll be pushing it to its limits. Do you have any Zeners laying around? Chris
  3. CDRIVE

    Digital Pot setup

    You can replace it with an LM317. A quick hack, if you have one, is stick a 12V Zener in series with the input pin of the 7805. If you do this I'd also connected a 4.7KΩ from the input pin of the 7805 to ground. A 1uF cap in parallel wouldn't hurt either. Chris
  4. CDRIVE

    Problems substituting a relay

    I messed around with the values of ZD1 and C2 until I developed an acceptable plot. I included notes and virtual meters on the plots to make it easier for you to decipher. The left side of the plots (ramp up time) start at zero time when this circuit is first connected to the Mains. The ramp up...
  5. CDRIVE

    Problems substituting a relay

    Get a transformer or wallwart and be done with it. A wallwart is cheaper and easier!
  6. CDRIVE

    Looking for an experienced custom gadget maker..

    CC considering the foul mood you're in you can get more of that to pick up your spirits. Google "Drinking With Bob" and "Sheriff Bill". I always feel better afterward. We all know or should know who the chief purveyor of class envy is (actually - "are"- plural), so remember that in November. One...
  7. CDRIVE

    Looking for an experienced custom gadget maker..

    Hey CC! Norm Abrams has nothing on you! Brrrrrmmm ;) Chris
  8. CDRIVE

    Problems substituting a relay

    Great, let's have a coldie! Chris
  9. CDRIVE

    Problems substituting a relay

    Bassmo, this whole thread is just bots! Tell us again why a transformer or yes, even a cheep wallwart can't replace this power supply. This is a whole lot of fuss over something that is so basic. I said at the get go that I thought that PSU sucked. I still do. ;) Chris
  10. CDRIVE

    Problems substituting a relay

    I'm not the one who suggested a bridge. I don't care if we're talking ground or neutral. Please show me how you would use a transfomer-less bridge in his circuit without his common rail ending up 338V above mains neutral or ground. I say not happening. No argument regarding the shunt...
  11. CDRIVE

    Problems substituting a relay

    Your peak voltage will be 338V and line spikes have to accounted for too. I wouldn't use it. Chris Edit: I was referring to the 250V cap in your stash box.
  12. CDRIVE

    Problems substituting a relay

    Well, I think we've covered it all, so no sense in repeating myself. I think mine an your statements regarding the above quote needs clarification though. Yes, I used the term ground when I should have said neutral. Fact is though, they're darn near the same potential. The only difference...
  13. CDRIVE

    Problems substituting a relay

    Go for it but make sure the cap is AC rated. If you can tolerate a dimmer Org LED I'd also reduce the value of the shunt resistor too. The goal being to get the coil current as close to 20mA as possible. Good luck, Chris
  14. CDRIVE

    MOSFET IRF540A circuit.

    Justin, please write some simple code like flashing two LEDs or something. Power the 08M2 from your bench supply and measure the supply current into the Vdd pin at the following supply voltages. 5V 3.3V 1.8V 1.2V Probably won't operate this low though. Write your code so the chip is...
  15. CDRIVE

    Problems substituting a relay

    Hello Kris. I re-read what I posted because sometimes, ..actually most times, what I'm thinking vs what I'm writing comes across as a bit demeaning. If you interpreted it as such it was not intended that way at all. This is merely spirited discussion that is typical among all technical and...
  16. CDRIVE

    Problems substituting a relay

    Yes, it's a virtual Ammeter. Chris
  17. CDRIVE

    Problems substituting a relay

    Those plots were based on this circuit.
  18. CDRIVE

    Problems substituting a relay

    These are the results I got with the values shown. They're based on a 12V - 300R coil. I also ran a plot with a 1000uF filter cap not shown. Obviously, ripple was reduced even more.
  19. CDRIVE

    Tucker

    The coldie I guessed was a cold one, brewski, suds, frosty .. a brew, etc. Over here true blue translates to faithful. So a true blue American means the same thing. Beer Lovers United Chris
  20. CDRIVE

    Tucker

    Wow Dave, half way around the world and y'all have the same saying! It must be universal. ;) Chris
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