[time-nuts] Fluke Thunderbolt Monitor Revisited
GandalfG8 at aol.com
GandalfG8 at aol.com
Fri Jun 4 16:12:27 UTC 2010
In a message dated 04/06/2010 16:53:36 GMT Daylight Time,
brooke at pacific.net writes:
I've added a photo of the component side of the 8051 PCB at:
http://www.prc68.com/I/ThunderBolt.shtml#8051PCB
J1-2 is connected directly to pin 6 of the uC which is also connected to
the output of the 78D05 regulator.
--------------------
Yes it seems to be, but if you check you'll find that it's not actually a
direct connection.
J1-2 and pin 6 of the uC are connected together and then connected to the
bottom of what's marked as D3 in your photo.
D1, 2 and 3 are in series between the regulator output and the processor
pin 6 but it's these that have been replaced with zero ohm links so metering
will show a direct connection.
It's these links need to be removed and replaced with diodes as per
Didier's original schematic.
regards
Nigel
GM8PZR
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