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  1. chopnhack

    Bench Power Supply

    Not quite sure what you mean by this Adam, I get it, but when I go to draw the schematic I am left confused. For example, if I do as you say, when I set up my lower v.reg, would the output then go to the former common now labeled 12V? I thought the output of the IC was going to be the negative...
  2. chopnhack

    Add current limiter on Bench PSU

    I am with you on this Konstantine! I too am looking for a way to add that to my build. I did add some PTC's at the end of the rails to act as absolute cutoffs to prevent shorts. I don't know if this is the best way of doing it or not. I think I will include an LED that comes on when overcurrent...
  3. chopnhack

    Measuring speed at impact between two objects....

    I agree that you should not give up too soon - much can be done with dedication! But you may spend more than a year on the project. Do you have the time and resources to do such? Is this a project with a hard deadline? Academic or for pleasure? I think that you should lay all the cards on the...
  4. chopnhack

    protecting leads on a jack?

    If the jack has solder tabs, consider getting the mating crimped connector: instead of soldering it. That way you have positive connection without risk of damage and the wiring can be further disassembled from the panel if necessary.
  5. chopnhack

    Measuring speed at impact between two objects....

    That is an interesting wrinkle ;-) Well, if you make the sphere bigger, you can use an arduino with some add on shields like this.
  6. chopnhack

    Measuring speed at impact between two objects....

    Great idea, but difficult first project! A simpler approach would be to photograph or video record the two spheres colliding against a background that you can take measurements against - like the kind you see in crash tests: http://www.canaralighting.com/automative_crash.html See the yellow...
  7. chopnhack

    Bench Power Supply

    The bleed resistor is carried over from the initial design so I am not sure its completely necessary. I recall using it to protect the IC from capacitor discharge and to make sure the caps bled out over time. I also noticed that I forgot to include the bridge rectifiers to the meters...
  8. chopnhack

    Bench Power Supply

    Hey Adam! Thanks for the reply. The second transformer is a small one to power two combination volt/ammeter LED displays. From what I read and as others have mentioned it needs to be powered separate from the power source. The black boxes at the bottom are the meters - 1 pair of wires for...
  9. chopnhack

    5-10 watt led circuit needed.

    That is not a lot of info to work with, but would this be of any use to you? http://www.ebay.com/itm/1w-3w-4-5w-4-7w-8-15w-LED-Power-Driver-Light-Power-Supply-AC-85-265V-Stable-Firm-/361162518443
  10. chopnhack

    Bench Power Supply

    I hope you guys can help me complete this project. I reviewed the original idea and many parts are still valid and necessary. I decided to look at more current chips, namely LDO regulators. Still not knowing enough to design a SMPS, I would rather stay with this simpler technology. Here is a...
  11. chopnhack

    Common Problems When Learning Electronics? Ideal Solutions?

    Colin has raised some very good points on electronics literacy. There are many hurdles to understanding - physics, math, logic - weighty material that the average joe will not comprehend readily and certainly not without a great deal of effort. That will thin the herd for viewership, but that...
  12. chopnhack

    16 bit 2-1 mux assistance

    I got lucky Constantine ;-)
  13. chopnhack

    16 bit 2-1 mux assistance

    Ok, I got it - the logic was sound - it was the idiosyncrasy of the online grader!
  14. chopnhack

    Have you ever gotten "lucky?" (when repairing electronics)

    Most of my fixes are lucky breaks ;-) Bad caps are usually my winning streak.
  15. chopnhack

    16 bit 2-1 mux assistance

    I am trying to finish a lab for an online course - no credit, just for knowledge and I am not sure if I didn't understand the principal correctly or if the online grader is not getting what I am putting down. The first picture is the "innards" of the the 2-1 mux that is then replicated with a...
  16. chopnhack

    Sealy supermig 185 PCB help

    Good job! Sounds like a loose connection. Be interesting to see if it reoccurs.
  17. chopnhack

    Question on assembly code

    Ok, so this is basically the processor from an old XT or similar. Isn't the first call to the bios chip for POST? You could always point the boot code to the next section if you have a lot of code with a label. Have you tried 'goto start' then label your next section 'start'
  18. chopnhack

    Help finding a simple product

    I am not aware of any either. Those molded strain relief are made with the wire as an assembly so they are fused to the wire. I haven't seen any aftermarket. Maybe someone else will come by with their experience. I do the same as you, use black shrink tubing.
  19. chopnhack

    Rest in Peace, Kris

    Kris, words can not express the gratitude I have for you. You took me along, a total stranger at the time, on a fascinating journey in electronics... something I have been interested in since I was a boy. You helped me understand, patiently explained and re-explained :rolleyes: concepts that I...
  20. chopnhack

    Question on assembly code

    I am not understanding what you mean above. Did you reprogram the 8088?
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