Search results

Search Forums New Posts
  1. chopnhack

    mesh

    @AnalogKid - good work mate, very well played :D:D
  2. chopnhack

    Newbie needing some assistance with a project.

    Welcome to the forum Aperturelab. To clarify, a battery tester or a battery power level meter? Is this to be in circuit continuously or will it be used like a tester, and put across the terminals when in use?
  3. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    In that case I will keep it on there - I doubt I will have large loads, but I haven't spec'ed out a cap for the psu yet, and that cap can very well produce a large transient! Thanks for the explanation - I was going to say choke, but I didn't understand just what it was attenuating! The cord...
  4. chopnhack

    How To Annoy Those Helping You Out

    LOL Just how many of these posts did you like :-P
  5. chopnhack

    How To Annoy Those Helping You Out

    Perhaps Ian can update the EULA or TOS or whatever we call our rules to include language that specifies clear titles and appropriately locating posts. Then he can include a filter to trash any posts with 'please' or 'help' in title! :D
  6. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    Agreed, I've had this unit for about 8 years. I've replaced the battery twice and still don't get the appropriate run time as well as periodic shut offs, I figured that the circuitry may have fallen out of spec. I assumed these units take a beating with load regulation and surge protection, so I...
  7. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    No plan as of yet, but I did score a nice find via recycling my UPS today - heavy duty power cord with strain relief! So that kind of counts as working towards this goal ;-) Sorry for the picture - the strain relief is the type where you notch your case and slip the molded relief area into the...
  8. chopnhack

    Current up to a node?

    Easier said than done! LOL I have been practicing Ohm's Law and its derivations on combination circuits and have been getting the hang of it, conceptualizing to find the ESR of a parallel grouping, etc. My current text of choice is Tab Electronics Guide to Understanding Electricity and...
  9. chopnhack

    Current up to a node?

    Thanks for the clarification Hop. I shouldn't have used the word node, point would have been a better choice.
  10. chopnhack

    Current up to a node?

    I think I understand - there is no potential difference between I and H - I and H should have the same potential difference, the difference will drop across the node. Thanks again!! :D
  11. chopnhack

    Current up to a node?

    Thank you Ratch, I follow your logic to a point - i.e. if the question asked I vs G - obviously, I would be greater since the current is distributed through and after the resistor. I just got caught up in the line of demarcation. Which I still wonder, just where exactly does that occur? If I...
  12. chopnhack

    Current up to a node?

    I understood all of them except question g. - Shouldn't the current at node I and H be the same since the current hasn't passed through the node yet? I.E. the voltage drop across the resistor is what determines how much current is distributed across this parallel network. Shouldn't the current...
  13. chopnhack

    Clean square waves using a 555 timer?

    Wow, thats a lot for caps.. There are many cheaper sources. Digikey, Newark, Arrow, E-Bay, etc.
  14. chopnhack

    Clean square waves using a 555 timer?

    LTSpice would be fun for that section, but I don't think it can be simply pulled apart from the rest of the circuit. Looks like when active, Q20 drives the circuits low and activates the discharge transistor, Q14. It also looks like it supplies the collector of Q25. I assume, when the reset pin...
  15. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    Would something like this work as a star crimper? Its reasonably priced.
  16. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    LOL, you guys are beast! I saw this the other day:
  17. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    Thanks for the kind words, Hop, I am blushing over here, LOL :oops: This I haven't fully understood as I figured it would be easy enough to adjust each supply, no? If you create a tracking supply you no longer have two independent supplies! Wouldn't that be more limiting. I asked about dual...
  18. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    Pleasure to have your input Dorke! No apologies necessary, I tend to go off on tangents so I can not blame you for that. This is but part of the psu build questions that I have asked. There are other posts that pertain to it as well. I thought it would be logical to start low and slowly come up...
  19. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    OMG Hop, I think its dry now :D:p Make the Mrs. a cutting board already :rolleyes::D I spent some time looking at various designs again, I know.... I am a sucker for eeking out every last drop of <whatever>. There are so many cool features to 'build' into a psu that you feel bad not to at...
  20. chopnhack

    Zeroing out a LM317 reference voltage with a zener - PSU build

    Without a doubt :eek::D - Easy to do though!! To be honest, I have been getting multiple ideas and inputs from various locations. So I have been filtering and processing the various items that pop up and the thoughts that go through my mind, so I apologize for the schizophrenic nature of these...
Top