Search results

Search Forums New Posts
  1. S

    How to match these pins?

    I don't know your expertise-level. I've heard a lot of people here Google the issue they have for information. Start with the make and model of your DVD-ROM, and work your way through questions pertaining to your issue. Usually, you're not the first person to experience the issue you have...
  2. S

    Unpowered circuit testing

    Harald Kapp just gave you the method I use. You use the multimeter on the 'ohms' selection, making SURE you have no power to the unit under test. It's amazing how often you can find defective components using this method by comparing the same devices on each of the different channels...
  3. S

    VFD Keeps Dying

    The surge protector will only help in the short term if you're getting a large number of large spikes. Don't get me wrong, if you can't monitor your power feed and aren't sure of the exact problem, the surge protector might actually solve it. But not knowing for sure is the problem. Is...
  4. S

    Mystery International Rectifier part

    I didn't Gioogle this part, but I've got a comment. With the advent of RoHS (lead-free) requirements, I've noticed a lot of manufacturers are now adding a one or two letter suffix to their part numbers, to designate them as lead-free. That may not be the issue here, but a trivia comment. If...
  5. S

    Identifying an unmarked plug

    When I see a problem like this, I start looking-up the manufacturers of the instruments I know that use them, looking for any part numbers I might be able to cross reference. It sounds like a lot of those instrument manufacturers use the same connector, one of them might list enough...
  6. S

    dishwasher electronics problem

    The two Kenmore problems I had, were: Failed timer switch itself, and the switch that monitors door being closed or open. If the switch that tells the machine the door is closed is not working, the machine will wash the clothes just fine, but won't allow the spin cycle to start. Don't know...
  7. S

    VFD Keeps Dying

    Like Y2KEDDIE said. I use a Dranetz Power Line Monitor, and watch the incoming power line for voltage spikes over time. Usually, the problem I find most often with Variable Frequency Drives is damage to whatever thyristors are used, SCR's or Triacs. The VFD takes a bunch of incoming power...
  8. S

    There goes the neighborhood

    A brave soul who wants to do for himself, instead of having others do it for him. You're very welcome here, as most of us suffer the same syndrome. Don't hesitate to drop a question or two here on your project, there are some very smart do-it-yourselfers here. We welcome your arrival here...
  9. S

    laptop motherboard problem !

    I'd go with GreenGiant's checks first. Other possibility is a broken power jack on the laptop, that is shorting connections to input power/switching.
  10. S

    multisim convergence assistant

    If 'U2' is your ammeter, you're shorting your Voltage Regulator to ground.
  11. S

    Most Precise Voltage Comparator Available?

    Burr Brown made some of the best circuits I've run across. They were bought-out by Texas Instruments, who dropped a lot of the Burr Brown line. But TI still sells some of the most popular Burr Brown line. I'd check TI for Burr Brown comparators. If there's somebody out there making better...
  12. S

    Low amps cause my amplifier to smoke?

    Darned right, duke 37. I've often used an incandescent lamp in the place of a fuse when I wasn't sure what was going to happen in a circuit. A fuse just pops. A lamp in series handles the current, and allows you to find the problem in the circuit. Great suggestion here.
  13. S

    Opto-isolator

    Like Harald Kapp and Jotto said. It's primarily to isolate a higher voltage circuit, from a lower voltage circuit.
  14. S

    Wiring of a Ammeter

    You meter is the key. Make sure it has high input impedance, for best accuracy.
  15. S

    Looking for a Good Introductory Communication Theory book

    Electronic Communications Systems, George Kennedy. It's a college-level textbook that's been a staple in classes for over thirty years, and for good reason. I'm suggesting this because it introduces you to a little bit of everything in the field, and there are so many of them out there (used...
  16. S

    Who Is This?

    I figured he/she was toast when he/she knocked Harald, who in my book, is an good guy to ask questions of. Amazed at how quick the reaction was, good work, Moderators.
  17. S

    Switch Problem

    Do you have resistance in the heating elements themselves, or an open circuit?
  18. S

    Anti shoplifting equipment

    You need to be a little more specific. It's difficult to use anything except cameras for overall surveillance. Are you talking about tagging items, and having a detector at the exit door? We need more information about your specific goal.
  19. S

    What amazes me

    I needed to come here because the British don't like us lowly colonists from the Americas asking about their electronic parts, and the Aussies tolerate our European parts questions.
  20. S

    Serial Stringing Resistors ??

    Yeah, but I wonder about your statement that you want to put the large resistor closest to the power supply. Like MrEE said, the current will be the same through the series circuit. Make sure, if you're using different sized resistors, that the small ones are able to HANDLE that series...
Top