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American Bass 1100.1
American Bass 1100.1
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Old 17th July 2019, 05:29 PM   #51
Perry Babin is offline Perry Babin  United States
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Is it possible that the driver IC is bad? They're easy to damage and can have all sorts of faults.

Don't risk damaging the outputs. Make a temporary heatsink from insulated aluminum stock.

Without the 4th IC, does the amp produce audio?
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Old 17th July 2019, 06:46 PM   #52
Deadly Sones is offline Deadly Sones
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It could be... I mean I did reuse it 4 times. (moving it from one location to the next). I do have a hot air station I use. I'll get more into it tomorrow. Thanks.
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Old 17th July 2019, 07:16 PM   #53
Perry Babin is offline Perry Babin  United States
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I wouldn't use hot air. It takes too much heat applied to the board and IC. Use a soldering iron with relatively low heat and solder quickly. Using flux and lightly scuffing the terminals can make the soldering go more quickly. A fiberglass scratch pen generally works best for light scuffing but fine sandpaper (400 or greater grit) works.
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Old 21st July 2019, 01:10 AM   #54
Deadly Sones is offline Deadly Sones
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Ok. Will do. I went back to my old solder ways on the ic's. I think they not a problem. I barely get them warm. And if I dont get them right on the first pass, I wait till it cools before I fix it or even doing the next side. And, I always check them over afterward.

I went back to low power jig. It's making about +/- 30v. Have 2 probes running in every pic. 20v/div and 5us.

Everything seems to be running fine. Do these waves look ok? Before I try to go back to full power.
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Last edited by Deadly Sones; 21st July 2019 at 01:23 AM.
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Old 21st July 2019, 01:12 AM   #55
Deadly Sones is offline Deadly Sones
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This spike sort of bugs me...
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Old 21st July 2019, 02:20 AM   #56
Perry Babin is offline Perry Babin  United States
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I think something may be wrong with your setup. If you, in differential mode, touch both probes to the drain of one of the power supply FETs, what do you get?
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Old 21st July 2019, 02:56 AM   #57
Deadly Sones is offline Deadly Sones
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Good evening Perry

I get faint squiggly lines. I readjusted scope to 20v 10us. Both pins probing a drain. When I press the add button I get a 3rd trace that appears just above ch 2 trace. Not sure if it's suppose to do that. The first 2 are no remote. With and without the add button. The second 2 are remote on, with and without the add button.

I did get it to lock on for like a split second once when powering it up. But haven't been able to again to get a pic
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Old 21st July 2019, 03:01 AM   #58
Perry Babin is offline Perry Babin  United States
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In differential mode, you should have a single trace. Review the section on using the scope in differential mode in the tutorial to see if you missed anything.
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Old 21st July 2019, 03:26 AM   #59
Deadly Sones is offline Deadly Sones
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You're right. Something is not right... I have done the whole list. Both inputs on. Input set to add (which gives me that extra trace offset). Both channels to dc offset. Both vertical amps are set to 5v for this one. Ch2 set to invert. Traces are centered except for the added line that appears below soon as I hit add. Both leads are grounded together. Scope is grounded to power supply.

Channel 1 deflects the 2 traces up, channel 2 deflects the 2 traces down, both together one goes up, one goes down... and the added trace sits just below reference line
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Old 21st July 2019, 03:30 AM   #60
Deadly Sones is offline Deadly Sones
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It might be worth mentioning that with no traces enabled at all... this is where my line sits...
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