Search results

Search Forums New Posts
  1. dorke

    parallel led array

    Don't listen to Colin's B.S ! Definitely use the diodes!
  2. dorke

    parallel led array

    Colin, Where does your bullshit come from...? :mad: Please,check yourself before you post,
  3. dorke

    synchronous binary counter question

    1.The two 4-bits counters in the 4520 are cascaded to create an 8-bit counter. 2.An 8-bit counter would count from 0 to 255. (in binary 00000000 to 11111111) 3.To count up to any number in between these values,that value needs "to be recognized" i.e detected and cause the counter to be...
  4. dorke

    parallel led array

    Not very good,they may drop voltage up to 0.85V . You can try this one(3A instead of 5A) http://www.ebay.com/itm/NXP-PMEG3030EP-DIODE-SCHOTTKY-REC-30V-3A-SOD128-/181883178279?hash=item2a59150d27:g:3nYAAOxykMpTI4ce
  5. dorke

    parallel led array

    yes, you need 2 diodes on each + wire, as shown in the #5 the diode is PMEG3050EP here is it's data sheet: http://www.nxp.com/documents/data_sheet/PMEG3050EP.pdf So, you are running your LEDs at about 0.85A each for a total of about 2.5A. Your battery isn't very promising... see here(test of...
  6. dorke

    Turning supercapacitors into batteries

    1.yes. 2.generally,you need to charge it and let it supply it's charge to the load What do you want to use them for? What load? What voltage?
  7. dorke

    parallel led array

    GHOST HUNTING ??? Do post a pic if you catch one...:eek: Anyways, as per my post above a good choice would be this diode: PMEG3050EP If you have the Battery and LEDs datasheets post them here.
  8. dorke

    parallel led array

    A solution for that problem is using Schottky diodes like this: The diode will drop about 0.3V(typ.),should be fine with a 3.7V bat. and IR led.
  9. dorke

    Missing parallel resistors

    Your welcome.:) "...how we used to(?) get things done..." I just did that recently while fixing a vintage 70's Yamaha receiver. "electronic hand calculators (?)" good thing you didn't say "slide-rule" o_O We must be from the few here we still know what that was...;) "Be safe. Have fun. Live...
  10. dorke

    I am pretty sure my answer is right!!

    I think they are talking about a coil raped around a cylinder. That means the cylinder is hollow: there is only copper wire on it's "outer- case" . So you have a copper wire with a cross-section of 1.7mm^2 wrapped around the cylinder of diameter 0.13m 1.You did o.k with calculating the wire...
  11. dorke

    I am pretty sure my answer is right!!

    Very simple: Do not round the results! a) 320*(73/60)*3.6= ?? b) 320*(73/60)+6032 = ??
  12. dorke

    DA converter

    No,Not at all! Who put that idea into your head??? Electronics is a vast field basically dealing with "electrons behavior and it's manipulation". It is basically an analog world we live in (though,some of it in the quantum realm could be seen as "digital"). Computations and algorithms are...
  13. dorke

    Missing parallel resistors

    I believe the easiest way to solve these kind of question is using the equation for parallel resistors directly: 1/Rt= 1/R1 + 1/R2 +1/R3+ ...+1/Rn In our case here we have n=3. In general: Given only Rt ,It is always solvable even in the case none of the Rn's are given!!! The solution will not...
  14. dorke

    QSC 850 help

    I wanted to say: A shorted diode will blow the fuse instantly !!!
  15. dorke

    QSC 850 help

    A shorted diode in a bridge will behave totally differently! An open diode could cause that problem but woody says there is none.
  16. dorke

    QSC 850 help

    Another thing you can do is swap the secondarys like so:
  17. dorke

    QSC 850 help

    Disconnect the 3 points shown in the pic. In this way you can do a complete diode test of the disconnected bridge. You should get very clean 4 good diodes (forward and reverse).What do you get? Another thing would be to check the transformer secondary for A and B the AC voltages should be the...
  18. dorke

    QSC 850 help

    If I understand correctly: 1.P.S- A works perfectly fine with both PA-A and PA-B(each one at a time). 2 P.S- B doesn't work with PA-B. have you tried P.S-B with PA-A? 3.You are doing all the above tests by merely swapping VCC_A pair with VCC_B pair at the P.S side. While all boards are at...
  19. dorke

    Can I cut/split a pcb into half, then solder the traces back together?

    Raul, ! Qué locura !:eek: No amigo, no pienses en esto, nunca !!!
  20. dorke

    Sound activated switch advice

    GreyGnome, Besides learning about BJT's. Would you be interested in doing it in an "all digital way" for 20 cents or so? BTW, what batteries are you using?
Top