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  1. dorke

    TEAC Carousel 5 Disc CD Player PD_D600

    Welcome to EP, You should look for the rubber-belt that opens and closes the tray. It is very common that they dry out with time and fail(either get to loose or snap).
  2. dorke

    Yamaha RX - V 675 wont power up

    Welcome to EP, Do you have a service manual? I couldn't find any 2.6V PS, where do you see that? IC153 is powered by ± 7V.
  3. dorke

    DSP/Amp Problem (Reversed Polarity)

    relax, O as in O.L.(Over Limit), it is not zero...
  4. dorke

    Adding an LED to a device

    Not a very good idea to connect the LED to the "speaker". Simply connect it instead of the present LED with 2 wires.
  5. dorke

    DSP/Amp Problem (Reversed Polarity)

    Rick, Lets hope pin 15 is only 5V...;)
  6. dorke

    B & O Penta amplifier repair and Tr equivalents

    Well, The PA final Tr.s are not cascaded they are paralleled. You should check all the finals(in blue) drivers(in pink). Test them in "diode mode" B-C ,B-E and C-E that is a total of 6 measurements for each Tr.(3 and 3 in reverse polarity) If you need help with that post the test results in a...
  7. dorke

    Trouble identifying a MOV

    Remove the MOV from the print and read the full writing on it. If possible post a photo from the "Dark side".
  8. dorke

    newbie, what to read?

    Nulik, you don't need that machine! it is a waste of money and will not help you. What you do need to know however is to design and layout a PCB, that is not a trivial thing at all... Learn about USB and PCI, then think about how to connect them together. Do it on paper and in concept then come...
  9. dorke

    Help! Repairing water damaged PCB from Massage chair.

    It looks like the 74LS00 is o.k. but the table of #272 and #270 have some mismatches. Could you please re-check and post table #270 in the following conditions : 1. both Opto devices are not blocked. In the IC socket connect like this(careful not to short,isolated wires if possible)...
  10. dorke

    DSP/Amp Problem (Reversed Polarity)

    Pin 13 of U4(TDA3681J) should be GND, are you counting correctly? What is the voltage at pin 15 of U4 is it stable? What is the voltage at the base of Q10,is it stable?
  11. dorke

    Voltage multiplier

    What is the current needed at 100V/10Hz ?
  12. dorke

    newbie, what to read?

    Here is a PCI link. You must realize that unlike USB, PCI has no backward comparability between the different types of PCI . You will have to decide first which kind of PCI you are going to adopt, and than learn the details of each interface and combine them...by yourself. And, by the way, how...
  13. dorke

    B & O Penta amplifier repair and Tr equivalents

    On paper, you can replace the 2SC3281/2SA1302 with the 2SC5200/2SA1943. But you have to realize there is no such thing as plug and play regarding the replacement of output stage power transistors. In any case the Idle current should be adjusted(even when replacing with the same number Tr.s...
  14. dorke

    IR remote control switch

    The TSOP1738 is an integrated IR receiver ,use it.
  15. dorke

    Trouble identifying a MOV

    Please let us know in what part of the system is the MOV connected. If it is at the line input area,then let us know what is the line voltage in your country. If in another part let us know what are the voltages and/or devices involved. A photo could help as well.
  16. dorke

    Is my Rubicon ratcheting modular plug crimper defective?

    Sounds like it is defective. I would replace it.
  17. dorke

    newbie, what to read?

    "I have very little knowledge of electronics"... I wouldn't go into this kind of project. I think it way above the knowledge you currently have! In any case, the HW is the least of your problems writing the driver software and debugging it is much more complicated. And above all you can buy...
  18. dorke

    DSP/Amp Problem (Reversed Polarity)

    Rick, Don't forget to check the 5v instead of 12v, in post #12.
  19. dorke

    Potentiometer as a Variable Resistor

    What a mess this thread has turned into...:eek: I don't recall posting in the middle of it. How did that happen? Plus-don't get any alerts...:(
  20. dorke

    Basic Question concerning what Amps are?

    As davenn pointed out ..... Electric Current is defined in ampere units [C/sec]. Basically it is the amount of electric charge in coulombs per second. It is the amount of current in a wire at any given time. i.e this can be a function of time i(t),not necessarily constant. You could say it is...
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