Help Using Extra Outputs and daughter boards

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superchargingmachine
Experienced MS/Extra'er
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Joined: Tue May 04, 2004 3:46 pm
Location: Illinois, Central

Help Using Extra Outputs and daughter boards

Post by superchargingmachine »

I changed my topic in hopes of getting more traffic. This is probably a no no.

Please see my struggles at the link below.
http://www.msefi.com/viewtopic.php?p=129784#129784

How much power can a 2N2222/1K/1N4001 circuit handle? I know for fans a relay is required.
Fastest95PGT
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Post by Fastest95PGT »

Well, you'd be hooking ~14V (running voltage) up to the relay. So the transistor can handle ~14V without a problem.

What you need to watch out for is the current as the 2n2222a can only handle up to 500mA per it's datasheet.

Don't worry though. Driving a standard automotive relay only requires about 150-200mA of current so the 2n2222a can handle it without any trouble. Just don't forget the diode mentioned in the following diagram (the right side).

Image
1995 Ford Probe GT ~ Megasquirted & Boosted
275whp/242wtq @ 5.5psi ---- 317whp/287wtq @ 8.5psi
^^^ (thanks to MSnS-E and dyno tuning by me!)
2003 GSX1300R (Hayabusa)
superchargingmachine
Experienced MS/Extra'er
Posts: 348
Joined: Tue May 04, 2004 3:46 pm
Location: Illinois, Central

Post by superchargingmachine »

Thanks for the reply!!! It turns out my problem was a reversed transistor. I am pretty sure the silk screening is wrong on this daughter board but it could have just been a flat screw up on my part.

I had the valve hooked up through a test 2N2222/1k/1N4001 circuit and MS last night and it works perfect. On at 500RPM off at 3200RPM.
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