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  1. Kiwi

    Regulated Power Supply

    I have used one of these for my adjustable power supply' http://www.ebay.com/itm/DC-DC-Step-up-Converter-Boost-Power-Supply-Module-10-32V-to-35-60V-120W-/400442469292?pt=LH_DefaultDomain_0&hash=item5d3c3b2bac
  2. Kiwi

    Back EMF protection

    Thanks for the replies guys. From doing a bit of Googling I see that adding a reversed biased diode will protect the switching contact from high voltage spikes, but can adversely the response time of the solenoid. I found this article on the Crydom website. They did a test of the drop-out time...
  3. Kiwi

    Back EMF protection

    "The zener makes the solenoid response quicker..." Could someone please explain this? I just use a 1N4007 or 1N5408 diode across solenoids etc.
  4. Kiwi

    Old RS-232 compatibility with new computers?

    Have you checked "Control Panel" "Device Manager" "Ports (Com & LPT)" to see if the adapter is correctly installed. Also, what com port is it on? Some RS232 devices will only work on COM1 or COM2.
  5. Kiwi

    Car battery voltage drop

    Try an ebay search for "150W-DC-DC-Boost-Converter-10-32V-to-12-35V-6A-Step-Up" Hopefully the drop in battery voltage during cranking won't cause it to drop out. Cheap enough to try.
  6. Kiwi

    12 Volt Car Actuator Circuit

    Is the actuator just a solenoid that trips the lock? If it is use the alarm to operate an automotive style 12v mini relay that has a diode or resistor protected coil.
  7. Kiwi

    What is your favourite type of component?

    Any component that works after I have finished messing with it!
  8. Kiwi

    Aux car light switch setup?

    First thought was "way too many fuses on the switching circuits". Suggest fit a 5A switch common supply fuse instead of the 30A fuse shown in the second diagram. Delete the fuses between the switches and relay windings. If you are concerned about shorts in the switching wires to the relays...
  9. Kiwi

    Can a 6v light bulb blow a 12v transformer

    Is it possible that the original 6v bulb and transformer died at the same time?
  10. Kiwi

    Homemade starter relay sticks

    Why mess around trying to build something that might work, when eBay has heaps of suitable solenoids that are dirt cheap? Safety on the water is important, so don't risk your, or your family's, safety by taking cheap shortcuts.
  11. Kiwi

    Should wire be Twisted before Crimping?

    I don't twist wires in the uninsulated crimps like the one shown above. I twist the wires in insulated automotive terminals, and give each one a good pull to make sure the wire is securely held.
  12. Kiwi

    New build, new questions _ Lab PSU

    Here is a link to one I made a few weeks ago; https://www.electronicspoint.com/projectlogs/variable-voltage-lab-power-supply-using-psu.30/
  13. Kiwi

    Variable Voltage Lab Power Supply Using PSU

    Kiwi submitted a new Showcase Item: VARIABLE VOLTAGE LAB POWER SUPPLY USING PSU Read more about this showcase item here...
  14. VARIABLE VOLTAGE LAB POWER SUPPLY USING PSU

    VARIABLE VOLTAGE LAB POWER SUPPLY USING PSU

    I am an Automotive Electrician, so needed a power supply that could provide the range of voltages found on 12 volt and 24 volt vehicles during cranking and running. I have been caught before with equipment that worked fine at 12v or 24v, but would drop out at cranking voltages. The power supply...
  15. Kiwi

    Loctite on electrical connections

    Nylock nuts?
  16. Kiwi

    Controlling a DC motor with a PLC

    BHEKI. I use Omron PLC's, so not too familiar with Simens. Looks like you have a CPU222 module with 6 relay outputs. The outputs are split into two sets of three with a common for each set. Each output is rated at 2A, with a total maximum of 10A for the module. Please advise the full part...
  17. Kiwi

    Batteries in parallel for higher mAh

    Bob, instead of using three batteries in series with a buck converter, would it not be better to use three identical batteries in parallel?
  18. Kiwi

    Batteries in parallel for higher mAh

    "This is why some Diesel trucks use 2 batteries in parallel, so they can push well over 100A into the starter to get the engine moving." You are a bit light on the batteries fitted to some large American diesel powered 12v trucks. They can have up to four 1000CCA batteries fitted in parallel...
  19. Kiwi

    power supply issues

    For 110v ac input you connect a link between the two terminals. 220v ac doesn't require the link. That is a pretty mean power supply to run a car stereo. I would suggest that you use the adjustment pot to set the output voltage to 13.5v dc. This is close to the voltage that the stereo operates...
  20. Kiwi

    DC float switch controlling a 110v ac pump

    That power supply would be fine. The power supply just has to be the same voltage, and have a current rating higher than the coil current of the relay you choose. A relay similar to this could be a good choice...
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