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  1. KrisBlueNZ

    Fix 250 watt Dayton Plate Amp or Convert 400 Alpine Car Sub Amp for Home Use

    Hmm. If you're not experienced with electronics, I think you may be biting off more than you can chew. Also, I can't find a service manual or technical information on that model. You could try to find a power supply that can provide 14.4V DC at 50A or more, but I wouldn't.
  2. KrisBlueNZ

    Hello, Welcome! (Introduce yourself)

    Welcome Danny and Merry Christmas to you too :-)
  3. KrisBlueNZ

    Newbie in great need of help ! ! !

    Bob, perhaps you're looking at this the wrong way. People here have a wide variety of experience and knowledge. If you describe what you want to do, rather than how you think it should be done, we may be able to save a lot of time and suggest something you hadn't thought of.
  4. KrisBlueNZ

    Fixing an induction stove

    Hi there and welcome to Electronics Point :-) I have no experience with induction stoves - either using them or fixing them - but I'm interested to learn about them. Can you tell us the make and model number of the stove please. I take it that this unit sits underneath the top surface, with...
  5. KrisBlueNZ

    Translate stripboard layout to schematic diagram

    Same to you :-)
  6. KrisBlueNZ

    Fix 250 watt Dayton Plate Amp or Convert 400 Alpine Car Sub Amp for Home Use

    Hi there and welcome to Electronics Point :-) 400W at 14.4V DC is about 30A and you can at least double that to include inefficiencies in the power converter and the output stage in the amp. So you would need a 14.4V DC power supply capable of delivering at least 60A! I think it would be much...
  7. KrisBlueNZ

    Creating A DC and An AC power Source With Approximately Equal Effective Voltage Outputs

    Yes, as Dave says, if you feed "pure AC" into a 7809 you will damage it; it's not designed to have negative voltage at its input, and AC alternates between positive and negative. If you want to see how the 7809 handles ripple, you could feed it from rectified AC without a smoothing capacitor -...
  8. KrisBlueNZ

    Mono signal won't work with a stereo aux in - no sound at all ?

    The aux input on the vehicle's amplifier system may have a low input impedance, so it needs to be driven by a something that's designed to drive headphones directly. The MP3 player you connected to it would have provided a strong enough signal, but the microphone preamp probably doesn't. That...
  9. KrisBlueNZ

    No vertical in crt tv(Need Help)

    Cool :-)
  10. KrisBlueNZ

    Displaying multiple outputs on the same seven segment with a time difference of two seconds

    If you have "no control over the problem statement", that probably puts this question in the homework category. I've moved the thread to the Electronics Homework Help forum. What you need to do is called "multiplexing". You have four 8-bit counts, from four pairs of 7490 BCD counters, right...
  11. KrisBlueNZ

    Translate stripboard layout to schematic diagram

    Yikes! What a horrible design. Not your schematic - I mean the design itself. There are a few errors in your schematic. I suggest you start by hand-drawing a diagram that follows the physical layout but shows resistors as resistor symbols, capacitors as capacitor symbols, etc, and shows the...
  12. KrisBlueNZ

    Cordless 1500 Watt Hand-held Blow Hair Dryer

    I was thinking about putting some kind of quick-plug/quick-unplug socket on the back of the chair, but the roof idea sounds much better. The hair dryer's weight would need to be supported, using a chain perhaps, or some plastic-sleeved wire as used for retractable clothes lines. Put a strong...
  13. KrisBlueNZ

    Mono signal won't work with a stereo aux in - no sound at all ?

    Have you checked that the microphone preamp is receiving power in that vehicle? If that's not the problem, I'm out of suggestions :-(
  14. KrisBlueNZ

    HP 1742A Oscilloscope issue. All the Uncal lights are on

    Hi Cody and welcome to Electronics Point :-) I'm not familiar with that model, but in my experience, the Uncal indicators light up when the fine adjustment potentiometers (for the channel gains and the timebase speed) are turned anywhere except their switched position. These potentiometers...
  15. KrisBlueNZ

    Some Questions About Workings of a GLCD

    Hi there and welcome to Electronics Point :-) Sorry for the very slow reply. I guess no one here has direct experience doing what you want to do. I will try to answer your questions though. As I understand it, the Winstar LCD module's data sheet refers to the Neotec NT7107C and NT7108C common...
  16. KrisBlueNZ

    Get to know each other !

    Merry Christmas everyone (again)! It's midday on the 25th here. I'm with my partner Donna today. We're going to have Christmas dinner tonight at the house of her older daughter, who will soon be marrying her partner of many years, who is a truly excellent guy. They already have a little girl...
  17. KrisBlueNZ

    pin diagram

    If you want the PCB pad details, look at the next page of the data sheet: Numbers written one on top of the other, with a line between, are maximum (above the line) and minimum (below the line) specifications.
  18. KrisBlueNZ

    Photodiode or Phototransistor

    Merry Christmas to you too Colum :-) There was a thread where we argued about what the Radio Shack optical device was. Not sure we ever resolved it, but here's the thread: https://www.electronicspoint.com/threads/led-optic-sensor-circuit.268955/
  19. KrisBlueNZ

    "DC 3.7v to 9v 1A" Need Help..

    How about using a switch so you can switch the battery pack between 3.7V and 7.4V? Otherwise, keep looking!
  20. KrisBlueNZ

    "DC 3.7v to 9v 1A" Need Help..

    It's working, but it's not working very well. That is what you normally get if you operate a circuit outside its specifications. Can you rewire the battery pack to put cells in series so it produces 7.4V?
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