On Thu, 4/20/17, Jeff Bonanno via Groups.Io <jeffbonanno@...> wrote:
Subject: Re: [BITX20] Blown bitx40
To:
[email protected] Date: Thursday, April 20, 2017, 6:15 AM
hi Fernando, the regulator is U2, a SMD
LM78L09. i am fortunate enough to have two bitx40 boards and
was using one to diagnose a problem on the other. the
problem quickly became apparent after burning the tip of my
finger by touching the bad 9v regulator. it had a short and
was pulling quite some current. i replaced it with a good
one from ebay and the board worked fine. however in my haste
and exuberance, i reverse polarized the other working board
and had a new patient on the operating table. that one gave
an open circuit on the U2 9v regulator (along with the other
crispy components). i have not changed out the rf drive
components but have fresh parts on order for this purpose.
Jeffrey Bonanno, Ph.D., AC2PL
jeffbonanno@...
--------------------------------------------
On Thu, 4/20/17, Fernando Garcia <ferjanyen@...>
wrote:
Subject: Re: [BITX20] Blown bitx40
To:
[email protected] Date: Thursday, April 20, 2017, 2:59
AM
Hi Jeff bonanza, ?thanks for
the reply, could you tell me what
volage regulator blown on
your set? I have now ordered the RF
output and driver
transistors so as to replace them and
also fitted a Shotts
diode in line with battery supply as
well as a fuse to make
it idiots proof, hi. Will let you know
of the out come next
week. Thanks. Fernando.
