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Old 8th February 2011, 05:14 PM   #21
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Join Date: Sep 2006
Put the old 1 back in and heres what i have now,

1:5.01
2:3.77
3:4.25
4:4.61
5:4.99
6:0
7:0
8:4.53
9:3.74
10:1.50
11:0
12:4.98
13:6.82
14:15.70
15:0
16:6.85
17:15.74
18:5.01
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Old 8th February 2011, 06:17 PM   #22
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Location: Louisiana
The amp should be producing rail voltage.
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Old 8th February 2011, 06:22 PM   #23
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NO rail voltage. Only voltage i have is on leg 1 of the outputs 9.9 volts
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Old 8th February 2011, 06:38 PM   #24
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Location: Louisiana
Did you measure directly across the red and black wires?
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Old 8th February 2011, 06:43 PM   #25
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Directley across redand black twisted wires i have 100.6 volts
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Old 8th February 2011, 06:51 PM   #26
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Location: Louisiana
That's the rail voltage.

Do you have supply voltage on the op-amps?
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Old 8th February 2011, 06:57 PM   #27
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I have + - 15 volts on the tl072's But no output just makes the sub pulse once in awhile
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Old 8th February 2011, 07:06 PM   #28
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Location: Louisiana
What was the manufacturer of the 3526 that didn't work?

What is the DC voltage on pin 6 of U21?
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Old 8th February 2011, 07:11 PM   #29
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U21 pin 6: 4.50 then just keep climbing and climbing.


The 3526 that didnt work i bought from digikey and not sure who made it but it has the markings MS
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Old 8th February 2011, 07:16 PM   #30
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Location: Louisiana
The voltage on pin 5 should be 5v.

The voltage on pin 6 should climb to over 5v in just a few seconds. If it takes more than 10 seconds, U21 is likely defective.

The IC was probably made by MSI. Those are the ones I had trouble with.
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