Paul Hansel

Tag: rf

  • Beating the heat with an electric heart

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    paul
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    Back in the days before computerization, cars used to use thermal oscillators to make their lights flash. This Ideal Heavy Duty Flasher 537 (12V) is one such oscillator. Although it might be called a flasher relay, it differs from its cousin, the electromagnetic relay. They come in a metal can and hardly weigh anything –…

  • Popping the tire pressure monitoring relearn tool bubble

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    paul
    in

    [2024-07-06: Updated to include simulation results and more scope traces.] If you own a car, you’ve no doubt encountered this mystery at least once. The tire pressure monitoring system tells you your flat tire is on the driver’s side front, but it’s actually on the passenger side rear. This is a relatively modern car ownership…