Weird things with lm3886 (brainGT-kit) - diyAudio
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Old 11th June 2005, 11:04 PM   #1
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Default Weird things with lm3886 (brainGT-kit)

I just finished (at least that's what I thought I did..) an lm3886 BrianGT kit, but when I powered up I measured some strange values.
First of all, the power supply board makes 28VDC from 22VAC. Not exactly the 1.4 factor I was expecting.
Next, when I measured the DC offset, it was huge: about 1.6V on one channel and 1.7V on the other and the chips get very hot after running for some minutes without any load.

Any advice?
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Old 11th June 2005, 11:12 PM   #2
sss is offline sss  Israel
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something is wring with your connections , dont power it up again u will burn the chip , show some pics if u can
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Old 12th June 2005, 07:21 AM   #3
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Sorry, already took it apart. I've had it with those really stiff solid core silverized-copper (?) wires. Had to solder the - hard to reach - connections with the pcb's mounted in the case, that was just asking for bad connections.. Now I'll give it a go with some multi stranded wire and report back when I'm finished.
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Old 12th June 2005, 10:07 AM   #4
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Done! Now with DC offset 0.5 and 0.3 mV (not accounting for deviation of my 15 euro multimeter ). There was probably some shortage going on
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Old 14th January 2007, 03:58 PM   #5
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hi. where do you find electronic parts in haifa for diy?
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