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  1. J

    Can someone simulate this diagram for me please

    What LED spec did you use to simulate getting 0.6V? in LTSpice i cannot seem to be able to add a 1.7V 20mA LED .
  2. J

    Can someone simulate this diagram for me please

    Thank you, the LED's suggested for this is 1.7V@20mA
  3. J

    Can someone simulate this diagram for me please

    I think i've managed to create this diagram on LTSpice but i'm not sure how to run a monitor to monitor the output as a graph. If i click the man icon and type 1 in the stop time and then put cursor over the output i get about 970mV. I've uploaded the LTSpice file i created if anyone can help...
  4. J

    Can someone simulate this diagram for me please

    I came across the following diagram on the internet which is suposed to simulate the exact waveform a post catalytic convertor o2 sensor in a car does. I'm not too savy with this stuff and wanted to know if anyone is able to run a simulation of this exact diagram and show me how the output...
  5. J

    Help identify which pins power LED's on PCB

    I have a PCB pictured below that has a 6 pin connector soldered which is at the bottom. Can anyone tell me if there are two pins that are + and - that power the 3 LED's on this PCB? Thank you. Below is the pic:
  6. J

    Help with transient protection

    Sorry i'm a beginner. what would be the best and easiest solution? Could I not put a Zener diode on the input before the 7809 and maybe use a PESD1CAN on the CAN lines?
  7. J

    Help with transient protection

    I need some help and advice on how I can add transient protection on the following setup i've drawn up. On the input of my arduino I have a L7809CV regulator board which can handle voltages from 11 to 25v but as I understand if there is faults with the rectifying diodes on alternator then...
  8. J

    Parallel resistance

    Could I not add some in series on either the red or the black wire to increase the resistance?
  9. J

    Parallel resistance

    Sorry i forgot to mention I dont have the ability to change any of the 3 resistors, i can only add extra resistors between the canbus and the instrument cluster
  10. J

    Parallel resistance

    In the following drawing example I have a CANBUS that is terminated on both ends with a 120ohm resistor giving the final ohm reading of 60ohms across the two lines. I want to connect the instrument cluster that also has a 120ohm resistor inside it. This will essentially mean instead of there...
  11. J

    Basic Pulse generation help

    just an update, i've managed to get it working and speedometer displaying but it's through the canbus. I sent the correct CAN frame to it and it responds perfectly.
  12. J

    Basic Pulse generation help

    I've heard of it being done but not sure if it was through simulated wheel rotation. I just thought seeing as it has speed input and output and the description from the technical notes posted previously for diagosing speedo issues seemed to look like that's how it works. I'm now thinking could...
  13. J

    Basic Pulse generation help

    Below is a pic of the full pinout. The main connector is called K3. There is also a K4 connector but K4 connector is only for the turn signal wires. The main +12v i've connected to pin 22. From the same power supply +12v connection I took a wire to a rocker switch going to pin 21 to mimic...
  14. J

    Basic Pulse generation help

    Pin 20 is on the bottom left
  15. J

    Basic Pulse generation help

    I have the following wiring schematics for the cluster, does it help?
  16. J

    Basic Pulse generation help

    I just tried that, and the led is flashing slowly on the lowest range but still no sign of the speed going up on the cluster, just shows 0mph.
  17. J

    Basic Pulse generation help

    You mean without using the wave generator at all? Just the LED + to pin 20 and LED - on ground? I tried that and LED stays on. Yes the cluster was working perfectly fine. The speed is digital
  18. J

    Basic Pulse generation help

    I found the following manufacturers tech information related to diagnosing speedometer malfunction. Does this help figuring it out? The combination meter is the cluster itself
  19. J

    Basic Pulse generation help

    The VCC on the pulse generator goes to the +12v supply voltage right?
  20. J

    Basic Pulse generation help

    It seems a bit complicated :( do you think something with the wave generator? Wave generator seems to be working because it does flash the led on slower pulses
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