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Old 13th May 2017, 05:17 PM   #1
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Default sundown ns-1

Good afternoon,
Can some one tell me what is the part number for the audio driver chips of a ns-1 amp?
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Old 14th May 2017, 11:29 AM   #2
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The 4 identical Ic's are ir21844s
The 3 Little Ic's are TL072, LM293, LM211.
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Old 14th May 2017, 11:15 PM   #3
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I replaced u2, u7 and all the audio mosfets, but the amp have 50 volts at the speaker terminals. There is no shorted or leaking mosfets.
Any idea?
Thank you
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Old 15th May 2017, 04:45 AM   #4
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I removed the audio driver board and found out that near U1 and U5, there are three resistors R34, R43 and R44 which ohms values were way to hight, almost triple their value.
I replaced all three resistors and put back the audio driver. I went and tried testing again, but I'm still getting 50 volts at the speakers terminals. Does anyone have a schematic of this driver board, or something similar?
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Old 15th May 2017, 01:14 PM   #5
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For Q10, confirm that the emitter is directly connected to pin 3 of the driver ICs and the collector is connected to pin 2 of the ICs through an inductor.
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Old 15th May 2017, 03:59 PM   #6
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The emitter of Q10 is directly connected to pin 3 of all 4 driver ICs and the collector is connected through the inductor to pin 2 of all 4 ICs.
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Old 15th May 2017, 05:36 PM   #7
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Short Q10 collector to emitter. Does that eliminate the DC on the output?

I'm assuming that all outputs are in the circuit. Is that correct?
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Old 15th May 2017, 07:57 PM   #8
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Short Q10 collector to emitter before or after power up?
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Old 15th May 2017, 08:34 PM   #9
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Solder a jumper wire between them before you power it up.
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Old 16th May 2017, 03:47 AM   #10
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Before jumping the emitter and collector, there was about 50 volts, now after bridging Q10,
The output shows about 44 volts.
.
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