Search results

Search Forums New Posts
  1. KrisBlueNZ

    Hello Everyone!

    Hi Frenoy! Thanks for introducing yourself. You've already been pretty helpful. You can thank Ian for the layout and the look of the site. And the XenForo forum software (this site used to use vBulletin). We're mostly a pretty happy family here. I hope you stick around :-)
  2. KrisBlueNZ

    Stage Line 500W amp repair project

    The board was obviously designed to take two different alternative capacitors, so the manufacturer's purchasing department had more than one option they could buy. This is a common trick. As long as the ones you ordered will fit in one set of holes, you're OK.
  3. KrisBlueNZ

    Dead Automatic Battery Charger for Autos. Please help me troubleshoot.

    OK, the original one claims to be low-ESR but it's a cheap Chinese type with no publically accessible data sheet, and probably was never much good. The replacement isn't a low-ESR type at all. It will probably work but it will go the same way that the original one did, possibly even more...
  4. KrisBlueNZ

    XTR116 18F46K22-DAC

    You need to describe the whole project in detail. Start by explaining what the current loop is used for, what other circuitry is connected to the PIC, how it is powered, how the current loop is powered, whether there is any electrical connection between them (apart from the loop itself).
  5. KrisBlueNZ

    Trail Camera No Flash Troubleshooting

    I don't think I can add anything. I have no experience with camera flashes myself.
  6. KrisBlueNZ

    Suggestions and Ideas

    Hi there and welcome to Electronics Point. You would like to "use radio frequency into other applications"? What kind of "proposal" is that? Can you be more specific?
  7. KrisBlueNZ

    Dead Automatic Battery Charger for Autos. Please help me troubleshoot.

    The micro on the control board senses the battery voltage directly across the fat wires that go to the battery clamps. But if the relay is damaged, the controller could ramp the power supply up to maximum output voltage and still not be able to charge the battery. The power supply must be...
  8. KrisBlueNZ

    Help selecting RFID tag

    You might be able to use the 150 kHz tags if you can figure out how to get the cat to put its head through the antenna (a loop of around 20 cm diameter) on its way towards the cat flap. But these are cats we're talking about...
  9. KrisBlueNZ

    Alarm when handbag opens accidentally

    Can you replace the magnets with stronger ones? Small neodymium ones, maybe?
  10. KrisBlueNZ

    I broke distress strobe light with my multimeter when testing amps? (diagram)

    On the 5A range the meter will display the number of amps. An "A" symbol should appear on the display to make this clear. So a reading of 0.1 on the 5A range means 0.1A.
  11. KrisBlueNZ

    Motor Project

    You would need some kind of buffer between the micro's I/O and the stepper motor. The details would depend on the stepper motor, as there are several kinds. 3V is a pretty low voltage - both for the motor, and for the drive circuitry. No doubt there are stepper motors designed to run at 3V and...
  12. KrisBlueNZ

    Dead Automatic Battery Charger for Autos. Please help me troubleshoot.

    We are. That's why debe asked about the relay and I suggested checking the suppression components in the power supply.
  13. KrisBlueNZ

    Dead Automatic Battery Charger for Autos. Please help me troubleshoot.

    1. The capacitor you replaced should have been a low ESR type. Is that what you used? Do you still have the original? You said it's 2200 µF, 25V, but can you list ALL of the markings on it? 2. TR1 is very unlikely to be the problem. When the main switching MOSFET in a switching power supply...
  14. KrisBlueNZ

    Motor Project

    The MSP430's I/O is no different from that of other microcontrollers. But what voltage will it be running at? Is there a supply rail available with higher voltage than the MSP430's VDD rail? What voltage is it? You could use a MOSFET that is specified to turn on heavily with a low VGS voltage...
  15. KrisBlueNZ

    How does the current flow?

    I agree. I use conventional current except if I'm talking about the actual flow of electrons. That's relevant if you're talking about the internal operation of semiconductors, with their P and N materials and so on, where chemistry and physics are involved. For general use when explaining how...
  16. KrisBlueNZ

    Adjustable brightness torch??

    Google schematic symbols to find out what all the symbols are.
  17. KrisBlueNZ

    Adjustable brightness torch??

    No, a breadboard is a solderless prototyping system. ^ Breadboard v Stripboard aka Veroboard
  18. KrisBlueNZ

    Adjustable brightness torch??

    PWM is the sensible option. Can be done fairly simply using a 555 driving a MOSFET. See http://www.reuk.co.uk/LED-Dimmer-Circuit.htm for an example. It is designed to vary the speed of a motor but there's little difference. Here's the circuit from that page: Replace MOT1 with the torch (bulb...
  19. KrisBlueNZ

    Stage Line 500W amp repair project

    The Maplin ones are no better. The leads on the Digi-Key ones are quite short so yes, you should match them to the board. The rated voltage should be at least 60V DC and AC.
  20. KrisBlueNZ

    Stage Line 500W amp repair project

    C11 and C21? The originals are greencaps. I suggest http://www.digikey.com/product-detail/en/B32620A5104J/495-1275-ND/592852 (0.3" pin spacing) or http://www.digikey.com/product-detail/en/R75GF3100AA30J/399-5879-ND/2571314 (0.4" pin spacing).
Top