Lightning Audio Storm S1.1000 - diyAudio
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Old 17th September 2010, 07:28 PM   #1
m4ick is offline m4ick  United States
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Default Lightning Audio Storm S1.1000

This amp suffered shorted outputs. VERY shorted outputs, they're in pieces. I have two questions about this amp.

1 - This is the second amp my friend was told was "unrepairable" that came back with parts missing. Does anyone have a power plug for this amp or know if they are even sold? The plug has ground, power and remote on it.

2 - With outputs removed, the amp powers on and I see drive signal going to both banks of outputs. One bank has nice sharp + and - swings and the other bank is VERY nasty (ripply). Each bank is driven by an MIC4420CT, is that likely the only cause of the nasty drive signal?
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Old 17th September 2010, 09:13 PM   #2
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I've never seen one of these. The MIC4420s sound like it's a Rockford design. Can you post a photo of the inside of the amp?
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Old 17th September 2010, 09:57 PM   #3
m4ick is offline m4ick  United States
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Definitely Rockford judging by the MEHSA strips.

Sorry about photo quality but all I have is a camera phone.

Also, I know that it is missing a large polyester film capacitor near the output inductor, that was missing after he took it to the repair shop.
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Last edited by m4ick; 17th September 2010 at 10:00 PM.
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Old 17th September 2010, 10:31 PM   #4
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Find the terminal of the output inductor that's NOT connected to the positive speaker terminal. Connect that terminal of the inductor to the negative speaker terminal with a jumper wire. Does that give you a cleaner signal on the gates of the FET?
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Old 18th September 2010, 12:52 AM   #5
m4ick is offline m4ick  United States
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I'm a little confused, I've got the two leads of the inductor that are connected to the output fets and I have the BLUE OUT + and BLK GND on the other side of the inductor. BLK GND is connected to the - speaker terminal already.

Which of the 4 leads of the inductor are you talking about connecting to - speaker?
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Old 18th September 2010, 01:39 AM   #6
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The inductor probably only has 2 terminals. The other two terminals are a loop around the core to prevent the core from moving. The terminal directly connected to the output FETs is the one you need to connect to ground (chassis and speaker ground are the same).
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Old 18th September 2010, 01:57 AM   #7
m4ick is offline m4ick  United States
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Yep, you are correct. One was a loop around that went nowhere. I didn't even look to see.

I thought the inductor was connected to blue and black but it's only connected to blue, the other to the outputs. We all know what happens when we assume.

So with the outputs out of circuit I am basically grounding the would be output drains.
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Old 18th September 2010, 02:02 AM   #8
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I think it's the sources but I'm not 100% sure.
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Old 18th September 2010, 05:06 PM   #9
m4ick is offline m4ick  United States
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Wow, the drive signal cleaned up nicely.

What exactly does tying the inductor to ground do to make the signal clean up? Something to do with the feedback loop?
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Old 18th September 2010, 05:20 PM   #10
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There is no stable reference point until you ground the input of the inductor. You can also short the speaker terminals but it's not as effective due to the reactance of the inductor. This can only be done when the outputs are out of the circuit.
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