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  1. KrisBlueNZ

    Help repairing 3M model 101 Bridging Video Switcher

    What is the model number?
  2. KrisBlueNZ

    Help repairing 3M model 101 Bridging Video Switcher

    What is the model number? What are the fault symptoms?
  3. KrisBlueNZ

    hooking up impulse counter to bilge pump

    The impulse counter is not supposed to be connected in series with the pump. If you do that, there will be no (or very little) voltage across the pump. You need to leave the pump connected as it was before. So the counter uses a contact closure to tell when to increment its count. Is there any...
  4. KrisBlueNZ

    I want to make my own led reaction timer, but i dont know how to make circuits, need help with them

    And does that justify you asking a bunch of strangers to do your work for you? The least you could do is to ask nicely! And of course, tell us everything you know about what you want to do. You will need to buy a microcontroller programmer device and learn microcontroller programming. No one...
  5. KrisBlueNZ

    Help repairing 3M model 101 Bridging Video Switcher

    Hi Stanley and welcome to Electronics Point :-) I've edited the thread title to include the name of the device you're repairing. What is the model number? What are the fault symptoms?
  6. KrisBlueNZ

    I want to make my own led reaction timer, but i dont know how to make circuits, need help with them

    Yes, as Gryd3 said, people won't normally just design a circuit for you because you ask! We are just people like you. We are happy to try to help, but if you ask strangers to do your work for you, you should expect them to "tell you where to go"! You'll need a microcontroller and some hardware...
  7. KrisBlueNZ

    Driving a DCC model railway track with +/- 15V

    Yes, agreed. I'd use regulated +15V and -15V rails, and a half-H driver using MOSFETs. That could generate quite a lot of interference with rising edges of 2 µs or shorter! What is the operating frequency? Does the output stream include encoded data? Edit: See...
  8. KrisBlueNZ

    Help needed quick!

    Yes, agreed. If you have a cable with four wires, and you know that there's a camera at the other end that needs power (probably DC) and provides video and audio, that really is not enough information. There are all the possibilities Gryd3 mentioned in post #7 and others too. Perhaps if you can...
  9. KrisBlueNZ

    Noob Question About Current From Voltage Regulators

    In most, but certainly not all, cases, a resistor in a given circuit position only ever has one polarity of voltage across it, and that polarity is clear from the schematic. I never thought it was confusing. But as I said, this "U means voltage difference" might be all in my imagination!
  10. KrisBlueNZ

    Help needed quick!

    Well, maybe you should upload some photos. I guess it might be obvious to someone here. Can you show us any connectors? Or the connections inside the camera? Do you remember anything else about the box? How was it powered?
  11. KrisBlueNZ

    Noob Question About Current From Voltage Regulators

    I thought that "U" was used to indicate a voltage difference, rather than just a voltage. So for example the voltage across a series resistor would be denoted UR1 to make it clear that it's not supposed to mean the voltage at one or other end, relative to 0V. I thought that was kind of a good...
  12. KrisBlueNZ

    Help needed quick!

    Well, if the design is undocumented, it seems unlikely that anyone will be able to tell you that! You can upload any information you have, including some photos perhaps, but I doubt there will be any point.
  13. KrisBlueNZ

    Noob Question About Current From Voltage Regulators

    No doubt, that's the problem. Your insults in post #18 and post #25 are unacceptable. I think you need to take a little holiday. A couple of weeks to start with. Perhaps you will use this time to find a proper forum that will answer your questions to your satisfaction.
  14. KrisBlueNZ

    Help needed quick!

    Hi there and welcome to Electronics Point :-) I don't know what kind of help you're hoping for... I think your best bet would be to find the brand and model number of the camera, and do a web search for a replacement box to work with it. Perhaps someone has damaged their camera and would buy...
  15. KrisBlueNZ

    Need help on college question!

    You've simplified it wrong. You've got the three resistor values right, but they aren't connected the right way. It might help if you label each resistor with its original circuit reference. Since you will be combining R1 and R3, and combining R4 and R5, the three resistors in your simplified...
  16. KrisBlueNZ

    Is this a ceramic capacitor and is it bad?

    What do you mean it "will turn on and display the menu"? Do you mean that you can turn it on with the power button, and make the menu appear by pressing the menu button? You don't mean that it does this by itself? OK. Grab the service manual from Elektrotanya at...
  17. KrisBlueNZ

    Help buying a power supply

    Hi Ethan and welcome to Electronics Point :-) Your original power supply is a "universal" type that will run from 110V or 220V using an automatic changeover circuit that detects the voltage. It is specified for ±15% voltage variation, which is 93.5~126.5V or 187~253V. Since you're in America...
  18. KrisBlueNZ

    Need help on college question!

    OK. So draw up the simplified circuit and post it, then we can analyse it using Kirchhoff's Law.
  19. KrisBlueNZ

    Need help on college question!

    Hi there and welcome to Electronics Point :-) We don't give answers to homework questions - that defeats the purpose of having homework in the first place! But we will try to push you in the right direction so you can solve it yourself. The first thing to do is to redraw that circuit in its...
  20. KrisBlueNZ

    Induction motor

    What design work have you already done? What have your tutors told you? What sites have you searched using Google?
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