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  1. J

    Basic Pulse generation help

    Sorry I have no idea :D:D I've never worked with pulse generation before. This is the only documentation I have. I think I just need to provide the pulse generation power to the Speed Signal Input pin because the output pin takes that reading and sends it to other parts of the car from what I...
  2. J

    Basic Pulse generation help

    I have a speedometer/instrument cluster from a car that I am doing some bench tests on. I've got the cluster powered up by referring to the pinout diagram. I've got turn signals emulated too. However, I want to emulate speed and according to the pinout diagram, there are two speed related pins...
  3. J

    CANBUS Question

    New to this CANBUS thing and trying to figure some stuff out. Can anyone tell me are all the CAN High and CAN Low signals throughout a cars network all the same? So for example if my instrument cluster has a CAN-H and CAN-L wire. Will running the CAN-H and CAN-L from the OBD port give the same...
  4. J

    12V to 5V 3A converter

    1K ohm? Any particular wattage? What will happen if the device tries to draw 3A with the resistor in place? Will it still be able to draw this? Do I put the resistor on the positive of the output?
  5. J

    12V to 5V 3A converter

    Thank you. I've plugged the above pictured converter in to 12V car battery and the output 5V i am powering a carputer. For some reason when i completely turn off the device, this converter makes a really annoying high pitch sound. When I turn the device on again then it stops. It's almost like...
  6. J

    12V to 5V 3A converter

    I have the following pictured DC 12v to 5V converter On the input I want to put a inline blade fuse. The output says 5V 3A. I was going to put a 3A fuse on the input but then I'm thinking is the input and output amp rating not going to be different? Seeing as input is 12V does that mean it...
  7. J

    1N5822 diodes

    Thank you
  8. J

    1N5822 diodes

    When using a 1n5822 diode, does a small amount of current still get through the direction it's not supposed to? Enough to power something that works on very few milliamps ? Because when I plug in a multimeter in the direction, it still reads a voltage but if I plug in something like a bulb it...
  9. J

    12v EL glow wire

    I have a 12v EL glow wire. It seems to come with some sort plastic cover at the end. I need to push the cover in to a hole but when doing so it gets tight. Can I remove the cover cap and refit it after I've fished it through a hole? What is the purpose of the end cap? As it comes of easily can I...
  10. J

    Operating mirror folding motors

    The mirror folds when power to the motor is in a certain direction using that switch and unfolds if it's the opposite way. Does anyone know how these motors work? Like if I provide power to it and it has unfolded using that power and the power remains in the unfolding position then the motor no...
  11. J

    Inline fusing 12v feed

    If I have a 12v supply going from a car battery to the common pin of multiple relays and I fuse it with a single correctly rated blade fuse at the battery end, do I need to also put blade fuse at the point of each relay? A few relays will be further back in the cars trunk and few at the front...
  12. J

    2 relays with a shared common

    Thank you. It's quite confusing when looking online for relays because some of the same Chinese relays are expensive with some suppliers and cheap with others so price can throw you off sometimes i guess. Are there good relay brands you would recommend? Also, lets say I have a 30A rated relay...
  13. J

    2 relays with a shared common

    Thanks. Out of curiousity, are there bad quality relays out there? Prices seem to vary hugely and some chinese ones are much more reasonably priced but wondering if these cheaper relays are bad quality? They are rated at 40A 12V and some are just the 4pin Normally Open and some are 5 pin with...
  14. J

    Measuring current draw from permanent +12v

    My car has a power folding mirrors which currently have a Ignition/ACC controlled +12v being the main +12v source for folding and unfolding. Problem is that when ignition is turned off I cannot operate the folding function as the +12v from IGN is interupted. So what I am thinking to do is take a...
  15. J

    Operating mirror folding motors

    That was exactly what I was looking for. Thank you :)
  16. J

    Operating mirror folding motors

    I have the following circuit diagram from my car which basically operates the mirror folding motors when I press a switch. If switch is pressed in, the mirror stays folded and if the switch is released then the motor unfolds. I'm trying to operate the mirrors directly without the switch. Can...
  17. J

    Reducing voltage for a driver driven LED strip

    So I bought a 2W 180ohm resistance metal film resistor to test it. It works well and is almost at the level where the buzzing sound is not there and I left it plugged in to a car battery directly for over 1.5hrs and the resistor did not get hot at all. I feel Iike if I take it a notch further...
  18. J

    Reducing voltage for a driver driven LED strip

    I have the following glow strip wire which comes with a 12V driver that you plug directly into a 12v source from the car. However, directly plugged in the drivers makes a humming sound and I dont want to hear this at all. I did a bench test with a variable voltage PSU and I much prefer the light...
  19. J

    2 relays with a shared common

    I found a electronics supplier who have suggested a High Capacity Extended Optical Logic board. They said the logic board can accept ground or positive switching. The inputs to the logic of the board are 'optically isolated'. The board will kick on and off when the level raises above and drops...
  20. J

    2 relays with a shared common

    I've tried again below, but i still think something wrong :eek: the relay coil seems like it has two positive connections on the 85 and 86 o_O
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