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7th December 2020, 12:51 AM
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#31 |
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diyAudio Member
Join Date: Dec 2016
Location: USA
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Got all the new silicon soldered in, but I have to repair the output terminals before I do final testing on it. They are apparently made of pot metal and snapped off near the board, I think I can use tiny screws to attach short copper bussbars to it.
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Gear I use: Tektronix 475 Oscilloscope, Lambda LA-200 Power Supply, Rat Shack DMM, 100w homebrew resistive dummy load, 20 Years Experience as a Navy Aviation Electrician |
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7th December 2020, 12:56 AM
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#32 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Test thoroughly. The 'typical application diagram' in the datasheet shows it working with a 2.7k resistor.
Is the filter cap for the VAA heating up?
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Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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7th December 2020, 02:41 AM
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#33 |
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diyAudio Member
Join Date: Dec 2016
Location: USA
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That’s for when VAA receives power from the positive rail, which is quite a bit higher than the 5v the chip is seeing here. I suppose it’s possible the wrong part got put there by mistake as well since the amp looks physically new, I’ve seen stranger things. Haven’t checked the cap, I’ll make it a point to check.
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Gear I use: Tektronix 475 Oscilloscope, Lambda LA-200 Power Supply, Rat Shack DMM, 100w homebrew resistive dummy load, 20 Years Experience as a Navy Aviation Electrician Last edited by miniman82; 7th December 2020 at 02:44 AM. |
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7th December 2020, 02:44 AM
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#34 |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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I would be having a look at the schematic to see what that resistor does.
As said by miniman82 the Vaa can be run off b+ via a dropper or a regulator/zener setup. Could be the pcb is multi-purpose.
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7th December 2020, 02:49 AM
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#35 |
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diyAudio Member
Join Date: Dec 2016
Location: USA
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Actually scratch that, I recall removing it to make sure it wasn’t the cause of the voltage being dragged down and it was fine.
__________________
Gear I use: Tektronix 475 Oscilloscope, Lambda LA-200 Power Supply, Rat Shack DMM, 100w homebrew resistive dummy load, 20 Years Experience as a Navy Aviation Electrician |
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