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| issues install flashing module a car 3rd brake light |
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| james_s:
That sounds an awful lot like the ordinary thermal flashers that have been around for decades. It wasn't until the 80s that I started seeing electronic flashers used for turn signals. I remember you could get thermal button flashers that stick on the end of a lightbulb base. They worked well at first but eventually the bulb would heat up and the flashing would get feeble, only blinking off very briefly. |
| wojtek077:
--- Quote from: forrestc on August 14, 2019, 06:52:09 am ---See section 3 about a voltage shifter at this page: https://circuitdigest.com/tutorial/zener-diode-types-applications-and-operational-principle The resistor probably isn't needed in your application since your device will stand in as the resistor. You choose the zener based on the amount of voltage drop you need. You'll also need to size it big enough current-wise and power-rating wise so that the amount of current you're passing through the zener doesn't result in the zener overheating. --- End quote --- On voltage fine but when I release brake pedal there's still leakage. Can I put the zener backwards and do a low voltage cut off? |
| wojtek077:
--- Quote from: ledtester on August 14, 2019, 09:49:54 am ---fwiw, here is, I believe, the first patent granted for a flashing brake light: #3,460,089 granted in 1969: https://patentimages.storage.googleapis.com/62/e6/3a/432bbdfbb55446/US3460089.pdf It is interesting to read how it works. No 555 timers or even any solid state electronics here: --- End quote --- Wow 1969 |
| james_s:
I'm not sure why that is surprising, turn signals had thermal flashers at least as far back as the 1930s. By 1969 solid state flashers were possible, I mean we had computers, transistor radios, jet airliners and moon rockets by then. |
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