email(at)jaredyates.com
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 Posted: Sat Jan 29, 2011 6:39 am Post subject: Questions about the 9005 Low Voltage Module |
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Update- my 9005 unit is working now. I replaced the reference diode with another and all is well. I must have damaged the first one somehow. If anyone else i planning on making one of these, let me know. I have lots of extra parts from the digikey order minimums, and a functioning test rig that I can send you for a few bucks in shipping.
On Jan 4, 2011, at 10:11, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] At 09:28 PM 1/3/2011, you wrote:
I don't think so. The LM series devices are National
Semiconductor originations. All competing manufacturers
have to put out a drop in duplicate of the part.
If the voltage at U107-3 had been zero or identical
to an adjacent pin, then I would suspect a solder
splash or an ECB defect often called a 'cat hair'.
The fact that your measurement is unique and way out
of whack for what the LM285 should present suggests
that neither event is in force. You might check
markings or color code for the R104 . . . make sure
it.s a 4.7K and not something higher. Also re-flow
the solder joins on R104. It's extremely rare that a
new part is bad out of the box so if the LM285 is
not installed wrong, we need to explore other possible
causes for U107-3 voltage not to be 2.50 volts.
Bob . . .
[b]
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