Knock Sensor light?

[Rex Weatherford]

----- Original Message ----- 
From: "steve ravet" <sravet at arm.com>
To: <gmecm at diy-efi.org>
Sent: Friday, January 12, 2001 3:40 PM
Subject: Re: Knock Sensor light?


> Since it's called a 12V LED it probably already has a current limiting
> resistor built into it.  In that case, use it as is, and delete the 390
> ohm resistor from the schematic.  Is there a resistor physically
> attached to one leg of the LED?
> 
> Too much resistance means a dim LED.  Too little means a blown up LED. 
> If it does blow up, get another one that's not for any particular
> voltage, and use the circuit as is (with the 390 ohm resistor).
> 
> FYI the 555 output will be about 1.5 volts below the voltage used as
> power, given a 25ma load on the output (according to the NS datasheet). 
> In this case if the power is 13.5 then the output will be right at 12
> 
> --steve

Thanks guys I'll give it a try!

Muchos!

Rex

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