[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:

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.

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