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Circuit
Posted by BillJ (more from BillJ) on Wed, 29 Aug 2001 17:23:21
In Reply to: Modifying computer for full boost! 1st + 2nd gear! LDH HELP!, Eric, Wed, 29 Aug 2001 15:07:58
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I can't comment on whether the squarewave will do what you want, but the data sheet (below) for the ICM7555 timer IC (an extremely cheap and common component) contains applications that should produce the squarewave for you (I recommend using circuit 1a, which uses the 7555, 1 resistor and 1 capacitor). A 10K resistor and a 150nF capacitor will give you 476Hz.
You should be able to drive it directly from the 12V supply (which varies, in practice, from 12-14V), but I would put a 100nF or greater capacitor across the supply near to the device to decouple it.
The output can only source 100mA, so if the ECU doesn't like it, there is a fair chance that it doesn't have enough oomph to damage anything.
posted by 62.253...
ICM7555 data sheet (PDF)
Posts in this Thread:
- Modifying computer for full boost! 1st + 2nd gear! LDH HELP!, Eric, Wed, 29 Aug 2001 15:07:58
- Looks like BillJ's got a good suggestion..., LDH, Wed, 29 Aug 2001 23:42:04
- Re: Modifying computer for full boost! 1st + 2nd gear! LDH HELP!, eric, Wed, 29 Aug 2001 22:23:54
- Circuit, BillJ, Wed, 29 Aug 2001 17:23:21 <-- Viewing This Message
- Re: Modifying computer for full boost! 1st + 2nd gear! LDH HELP!, sully, Wed, 29 Aug 2001 15:47:27
- Re: Modifying computer for full boost! 1st + 2nd gear! LDH HELP!, KeithG, Wed, 29 Aug 2001 15:43:47
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