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  1. KrisBlueNZ

    Help building a controller for hydraulic transmission

    Hi there and welcome to Electronics Point :-) Unfortunately, for legal and safety reasons, it's our policy to disallow discussion of modifications to motor vehicles, so I'm closing this thread now.
  2. KrisBlueNZ

    Microcontroller controlled by pushbutton for LED flashlight

    Yes, get MPLAB X. You don't need that pullup resistor on your board as long as you enable the weak pullups on the GPIO port via the -GPPU bit in the PIC's configuration register. The -MCLR/VPP pin is used during programming, but you can (and often do) configure the PIC to ignore it during...
  3. KrisBlueNZ

    Applying a Sensor Output Analog voltage to a microcontroller

    The temperature output can be configured as voltage or current and the range can be selected, using the programming keys on the unit. See http://www.micro-epsilon.com/download/manuals/man--thermoMETER-CT--en.pdf section 8.1.1.
  4. KrisBlueNZ

    The Standard of Engineering Graduates

    I think (hope) that they will continue the tradition of engineering extremely low-cost, low-quality products to be sold in dollar stores and Walmart-alikes worldwide, to disappoint consumers when they don't work properly from new, and break after a week or two and end up in the local landfill.
  5. KrisBlueNZ

    Week 9/11 Progress(?)

    There's no context for this thread. Is there another thread that explains what you're talking about? If so, can you link to it?
  6. KrisBlueNZ

    Applying a Sensor Output Analog voltage to a microcontroller

    What is the sensor? Can you post the manufacturer and part number, or a link to the data sheet?
  7. KrisBlueNZ

    a timing circuit

    That's a start but I said in post #13: I can't see the LEDs, and I can't read the markings on the transistor. Take as many photos as you need to ensure everything is clearly visible and readable.
  8. KrisBlueNZ

    Interference in video switching circuitry

    OK, it's possible that the Sega's video output is AC-coupled. This is not good but there may be a way to fix it without using bipolar switch ICs. Try this circuit on the one input you're having trouble with. It's a diode clamp that will shift the DC level of the video so its most negative point...
  9. KrisBlueNZ

    a timing circuit

    You've definitely wired something wrong, and/or used the wrong component values. Can you upload enough photos of your circuit so every component and connection is clearly visible, and we'll go from there.
  10. KrisBlueNZ

    Stage Line 500W amp repair project

    The tolerance isn't critical - ±5% would be fine, though nowadays most resistors are ±1%. But R30 and R32 need to be rated for 1W power dissipation. Either of those options would be fine.
  11. KrisBlueNZ

    Differential amplifier single ended output calculations

    Would the difference in currents be due to the Early effect? (https://en.wikipedia.org/wiki/Early_effect) Q1 has about twice the collector-base voltage of Q2, and according to that article, this should cause a somewhat higher collector current in Q1, which is what you see. According to the...
  12. KrisBlueNZ

    Interference in video switching circuitry

    OK, that's good. There is definitely a problem with the DC level being lost. I'll show you what I mean. Here are your white screen and black screen video signals, with the 0V DC voltage level shown as a blue line. The sync pulses are filled in green. And this is how those signals are supposed...
  13. KrisBlueNZ

    Trying to find out the name of a type of component.

    Sorry, I've put you wrong there. You shouldn't use a comparator with a reference voltage for detecting the temperature. You need the voltages at both comparator inputs to be proportional to the battery voltage, because the battery voltage will vary as it discharges. So you need a two-resistor...
  14. KrisBlueNZ

    Microcontroller controlled by pushbutton for LED flashlight

    OK, here's an updated schematic. I removed the separate decoupling capacitor and specified the reservoir capacitor, CR, as 1 µF. It should be a multi-layer ceramic (MLCC) with X7R dielectric such as http://www.digikey.com/product-detail/en/C1608X7R1C105K080AC/445-1604-1-ND/634399. The P-channel...
  15. KrisBlueNZ

    Bi Colour LED Control

    I agree with Harald's and Steve's comments. Here is the only suggestion I'm going to make. It's basically Harald's window comparator suggestion implemented with transistors. If the FPGA pin is set to input mode (or, preferably, output mode but tri-stated), it will float to a voltage...
  16. KrisBlueNZ

    Analog Switch Help

    No. I did a little bit many years ago, but not recently. Start a new thread describing what you want to do, and asking for help.
  17. KrisBlueNZ

    Analog Switch Help

    Let's keep the conversation here. I think I've been clear enough. I recommend switching the regulator output voltage the way I showed in post #11 but your design will work. When the regulators are OFF, there will be no voltage available at the output of the analogue switch, regardless of the...
  18. KrisBlueNZ

    Analog Switch Help

    What about it? It will work.
  19. KrisBlueNZ

    Analog Switch Help

    Well, I can only show you the best way to do it. I can't force you to do it that way! It's your project!
  20. KrisBlueNZ

    Analog Switch Help

    You want to use two regulators and an analog switch IC, instead of just one regulator?
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