Re: Knock LED light on an 85 APC - Saab Performance Bulletin Board - Saabnet.com
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Re: Knock LED light on an 85 APC
Posted by Bill S. [Email] (more from Bill S.) on Mon, 15 Nov 2004 13:32:42
In Reply to: Knock LED light on an 85 APC, Inga [Profile/Gallery]
, Sun, 14 Nov 2004 19:14:14
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I was thinking about something like this lately, although I was thinking about an LED that would illuminate when the APC controller closes the solenoid (reverts to base boost), to indicate 'APC Limiting'.
I'm planning on creating a circuit that goes from a constant 12V source, through a suitable resistor, then through the LED, then connects to the 'hot' side of the APC solenoid (not the ground side). When the APC solenoid is open there won't be any current flow through the LED (both sides at 12V), but when the controller takes the 12V away from the solenoid the LED will ground *through* the solenoid, with the resistor keeping the current low enough that the solenoid won't try to actuate.
--+12V----Resistor----LED------\____APC Solenoid____ground.
---APC controller(pin12?)------/
It should work. It won't specifically indicate knocking, but will for the most part.
posted by 130.76.32...
Posts in this Thread:
- Knock LED light on an 85 APC, Inga , Sun, 14 Nov 2004 19:14:14
- Put one on an 86, are they the same?, patm, Tue, 16 Nov 2004 16:27:11
- same boat..., Ed S, Tue, 16 Nov 2004 08:13:09
- Re: Knock LED light on an 85 APC, Bill S., Mon, 15 Nov 2004 13:32:42 <-- Viewing This Message
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