[time-nuts] Fluke Thunderbolt Monitor Revisited

GandalfG8 at aol.com GandalfG8 at aol.com
Fri Jun 4 12:12:27 EDT 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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