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Recent content by PlaneCrazy

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    PWM replacement for car lighting dimmer

    The original spec lamps for these cars are no longer available. Modern lamps of the same from factor have higher power output, which means they are brighter (yay!) but get hot enough to melt the plastic trim (doh!). I have been running LEDs for years in my one car without the dimmer. But I...
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    PWM replacement for car lighting dimmer

    OK, so here is what I have so far: These elements can all be tested in Proteus, although they may be interchanged in practice with equivalent alternatives. The frequency range appears to be 30kHz-35kHz.
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    PWM replacement for car lighting dimmer

    I am aiming for 25kHz. It is beyond the audible frequency range, it hardly seems to affect incandescent bulbs, and seems well-suited to LED's.
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    PWM replacement for car lighting dimmer

    I cannot simulate the load dump circuits, but I will look into it. @Galgso, your circuit seems to work well, even if I have to add a ground wire.
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    PWM replacement for car lighting dimmer

    I will test the LEDs with my Arduino.
  6. P

    PWM replacement for car lighting dimmer

    There is a grounding point behind the cluster. I could certainly use that.
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    PWM replacement for car lighting dimmer

    Good catch! This is why I need help. Thanks.
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    PWM replacement for car lighting dimmer

    Where the rheostat unit connects to the instrument cluster, it interrupts the +12VDC line in series with the bulbs. This is the only way I can implement a drop-in replacement. You can see on this unit that the rheostat has been shorted, so the lights are at full brightness all the time; as...
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    PWM replacement for car lighting dimmer

    Good observations, but I have been using LED backlighting in this car for a while. The LEDs cause no problems for backlighting, except that it cannot be dimmed with a simple potentiometer. The dimmer does not work on the warning lights, which should be obvious but I will mention it all the same...
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    PWM replacement for car lighting dimmer

    Greetings, all I drive a 1980s Mercedes-Benz, with a series-connected rheostat dimmer for the instrument cluster and console lighting. These rheostats are notoriously fragile, and when they fail, the car is legally and practically unsafe to drive at night. Also, I would like to upgrade the...
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    Warning light for DC motor

    I don't know. Based on the flow rate of the pump alone (115 lt/hr) the pressure (i.e. the flow resistance of the system) isn't very high. You suggest a pressure transducer when my primary concern is flow rate. Flow meters add too much resistance based on my experience, which is why I am not even...
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    Warning light for DC motor

    These look promising. Thanks for the suggestions.
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    DIY car radio?

    Greetings, all We live in an amazing time. Forums such as this one provide information freely and readily, 3D printing allows for the rapid development of new and interesting devices, one flash disk can hold hours' worth of high definition music, mobile phones can download or stream music on...
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    Warning light for DC motor

    Thank you, Mike, but that is not a viable option. It is too pump-specific. I want to check the motor, which just happens to be powering a pump in this case.
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    Warning light for DC motor

    Greetings, all I have installed an additional turbine-type electric fuel pump on my car to increase the fuel flow rate to the engine. I would like to install a warning or error light to inform me if the pump is failing or has failed. How would I do it? Would it be similar to the alternator...
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