nuckollsr(at)cox.net
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 Posted: Fri Jul 06, 2007 5:03 am Post subject: Automatic Headlight Hi/Lo Fallover Circuit |
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At 07:41 PM 7/5/2007 -0400, you wrote:
| Quote: |
Bob,
Sorry I wasn't clear. The magnetic current sense element as described
could be applied to the circuit described by Eric and thus eliminating
the gain block and the series resistor required to develop the I/R drop
that is the input to the gain block. Just after sending my previous post
I saw your sensor circuit post.
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Hmmm . . . guess I missed Eric's suggestion and got out of the loop.
| Quote: | So my concept was to utilize the reed switch to turn on the FET just as
you suggest turning on the LED indicator. The Volvo/Bosch module is
interesting in that it uses a bifilar winding with current from one bulb
going one way and current from the other in a pair (say front and rear
right turn signal). If both bulbs are burning the fields cancel and no
warning. This eliminates the problem of triggering a warning if the
lights are turned off or flashing. The only state that will switch the
module is unbalanced current in the 2 coils as in only one bulb lighted.
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Hadn't thought of that. I'll have to add it to the bag of tricks.
Thanks!
Bob . . .
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