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  1. Kiwi

    does someone know the function of R6,R8 and R9?Is it just current limiting

    Looks like there are two C5's connected to Q1.
  2. Kiwi

    Diode across Peltier to prevent reverse function

    Would a diode in series be a better option?
  3. Kiwi

    How to remove solder from plated-through holes?

    Didn't know there was such a thing as a desoldering iron. Might have to buy one as a Xmas present for myself?
  4. Kiwi

    Open door buzzer circuit help

    My understanding of magnetic reed switches is that the Normally Open(NO) and Normally Closed(NC) refers to the contacts when a magnet is NOT present. I assume that the magnet and switch will be together when the door is closed and will separate as the door is opened? I believe that you need a NC...
  5. Kiwi

    EFI governor help

    These governors are usually for diesel engines used on gensets or pumps etc that operate at a pre set speed. ACT = actuator to move the engines throttle lever. See Woodward DYNA for examples. MPU = Magnetic Pick Up on flywheel. Senses starter ring gear teeth. Remote Speed Pot may only give...
  6. Kiwi

    USB to RS232 adapter

    We use Digitus DA-70156 USB to serial converters at work. They seem to work well on the newer laptops that don't have serial ports.
  7. Kiwi

    Low oil warning /cut-out on portable gasoline generator

    Andre, "... its been running like this for almost ten years and I never had to top up oil in ten years!" I hope that means that you haven't had to do top ups between the regular oil changes?
  8. Kiwi

    Open door alarm to help avoid cracking your head

    I need those for my wife. Too busy "multitasking" to finish one task before starting the next. :D Hope she never sees this!
  9. Kiwi

    Alarm Dilema

    Haven't used many SCR's, but I was always told to connect a resistor close to the SCR across the gate and cathode to stop false triggering. From memory this was referred to as RGK? This resistor would be across C2. R1 and R2 may need to be lower resistance to compensate for this added resistor.
  10. Kiwi

    Buying components from China.

    I haven't had too many issues buying individual components from China. Did get some ATmega328P (Auduino) IC's that didn't have the bootloader, but that was easily cured. Just look for a supplier with lots of orders and read the feedback. I have been buying repeats of a dc-dc converter module...
  11. Kiwi

    Please Help! I Got A Trojan!!

    Result from quick Google search; https://malwaretips.com/blogs/zeus-trojan-virus/ This site is an electronics help forum, not really the best site for help with computer virus removal etc.
  12. Kiwi

    latching relay selector

    Would a 2 pole 4 position rotary switch do what you want? Finder 20.24 stepper relay?
  13. Kiwi

    Circuit failure indicator

    Sorry guys, but I'm going to attack this from a different direction. Above suggestions indicate the electrical operation of the coil, but don't indicate the mechanical operation of the valve. My suggestion would be to put a pressure switch on the output of the solenoid valve to make sure that...
  14. Kiwi

    Car radio wiring

    I might be getting old and blind, but I can't see an external negative connection in the diagrams, so would assume that the case was the negative/ground. As advised this is usually not an issue when fitted to a negative earth car, provided that the radio is electrically connected to the car...
  15. Kiwi

    Looking for Windows 8 and/or 10 compatible USB to serial converter to use with arduino pro mini

    This is what I use to program Pro minis in Windows 10, http://www.aliexpress.com/store/product/1PCS-CP2102-Serial-Converter-USB-2-0-To-TTL-UART-6PIN-Module/213957_32675987983.html
  16. Kiwi

    Help with alternator to battery bank wiring

    Try it with a normal bulb. LED's usually don't pass enough current to excite the alternator.
  17. Kiwi

    Help with alternator to battery bank wiring

    Sounds like you have it wired correctly. What size lamp have you got on the "L" terminal? Should be about 2-4watt. What is the history of the alternator?
  18. Kiwi

    Temperature 'sender' (sensor) Custom Replacement?

    "(old one reads "open", so gauge is always pegged on 'Hot')" "Cold (25C): 43 ohms. Hot (110C-ish): 0 ohms." Like Blujets, I think that there is a contradiction here. What is the model etc of the digger? Is this a Mitsubishi digger with Cat badges? What is thread of sender?
  19. Kiwi

    Troubleshooting a diode voltage drop

    I used to fit a diode as a crowbar to protect against reverse polarity in the modules I build at work. I changed to fitting in series diodes after getting a couple of units back with blown diodes because the "highly trained intelligent operators" had put the batteries in reversed. I also fit...
  20. Kiwi

    Charging an iPod from 12V in a car

    The regulator inside the iPod will limit the charge current to a safe rate that doesn't shorten the battery life. Using a higher rated charger/adapter will probably allow for faster charging. Depends on the size of the original charger.
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