Simple transistor circuit sub help needed
Hi, folks:
I'd like to tap you folks' knowledge, for this is not something I do every day. I have a failed uPA1478H (four element silicon transistor array), but only one-fourth of it is bad ;) I am repairing a Subaru ECM, that presently does not provide a ground for the Check Engine Light (CEL). I have determined that the base drive is present, but the failed junction does not turn on to complete the lamp ground. As I don't see an easy source for a replacement uPA1478 (tell me if you find one), what I'd like to do is sub a discrete transistor for that element, preferably one I already have in my junk bin -- I have a pretty decent junk bin. Datasheet picture (PNG format, with my scribbled-in circuit notes) he http://www.ncplus.net/~asavage/Subaru/uPA1478_01_.png (77k) http://www.ncplus.net/~asavage/Subaru/uPA1478_02.png (37k) Or, if you prefer JPEGs: http://www.ncplus.net/~asavage/Subaru/uPA1478_01_.jpg (147k) http://www.ncplus.net/~asavage/Subaru/uPA1478_02.jpg (74k) (Original NEC datasheet: http://www.necel.com/nesdis/image/IC-3566.pdf (59k) ) As you can see, the purpose is for 5v at the base (pin 8) to complete the lamp's ground (connect pin 9 collector to pin 10 emitter/ground) -- this is the OEM circuit. I don't think that I need the zener included in the original design, there's no inductive load. I do not know how much base drive current I have available beyond what the uPA1478 requires. Suggestions? -- Regards, Al S. |
Simple transistor circuit sub help needed
On Mon, 8 Sep 2003 02:22:07 UTC, "Al Savage" wrote:
Find the specs at http://www.nteinc.com/specs/2300to2399/pdf/nte2338.pdf A cursory look through my junk bin yielded two D2018 parts, which cross to NTE2338, so I'm all set. Soldered in, testing tomorrow. The 2SD2018 is working perfectly. Again, I thank you. -- Regards, Al S. This OS/2 system ("Tori", W4 FP15) uptime is 8 days 10:18 hours |
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