Sorry for being off topic, but its hard not to comment on the superb pics by Solosound.
Congratulations!
Congratulations!
Thanks Ultra, but these photographs are owned by Perry and his tutorial, the quality are the best. And only I use them for show my measurements, no eagerness to appropriate the great work from Perry
Dear Perry the voltage across the resistor R139 is 0.0027 v
Dear Perry the voltage across the resistor R139 is 0.0027 v
Confirm that the voltages on the LM339 are essentially the same as they were in the earlier post. You don't need to re-post them unless there are several that are significantly different.
the voltages in the LM339M:
1 4.8
2 4.8
3 11.5
4 5.045
5 7
6 3.5
7 5.045
8 1.46
9 3.45
10 4.8
11 3.45
12 0.0
13 0.0
14 4.8
the voltages in the LM311M:
1 -51
2 -51
3 -50
4 -51
5 -39
6 -39
7 -51
8 -39
1 4.8
2 4.8
3 11.5
4 5.045
5 7
6 3.5
7 5.045
8 1.46
9 3.45
10 4.8
11 3.45
12 0.0
13 0.0
14 4.8
the voltages in the LM311M:
1 -51
2 -51
3 -50
4 -51
5 -39
6 -39
7 -51
8 -39
With Q107 out of the circuit and the black probe in negative terminal
An externally hosted image should be here but it was not working when we last tested it.
The voltages there are right at the threshold so it's difficult to tell if they're working properly. If the voltage across R141 is significantly less than 0.5v, I think Q673 may be defective.
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