Re: Need help I put volts on the speaker connection. Ouch. Smoke.
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The ground pin is the same on both which puts the +V on the negative side of C111 which I bet is totally fried and possibly the opamp as well but beyond that I don’t see additional paths to other circuitry . ? v/r Fred W4JLE ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Daniel Isaza
Sent: Tuesday, May 16, 2017 03:25
To: [email protected]
Subject: Re: [BITX20] Need help I put volts on the speaker connection. Ouch. Smoke. ? The speaker and the PA power have the same connector on the board, I think Jim switched those wires while wiring everything up ? On Tue, May 16, 2017 at 2:19 AM, John Backo via Groups.Io <iam74@...> wrote: But the speaker connection is designed for a 2.3 mm plug. Are you sure you
didn't just connect up the voltage to the power input plug, but in reverse?
Or did you connect the voltage with the proper polarity but exceed the 12v limit?
If that is the case, likely many things were blown up and the whole board will
have to be replaced.
If it was the speaker connection, the damage may be local, but I don't see
from the schematic how that could have happened. There is no direct
connection from ground to +voltage at that point. If there was smoke,
there had to be a connection somewhere...just where will determine
the fix, if any. The logical connection would be through the LM386 and
the output capacitor.
But that is connected to the RX + line, and more components may have
become involved. Check the resistance values of R110 and R112 to see if
they have changed significantly. That might be a clue...
john
AD5YE
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