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Chip Amps Amplifiers based on integrated circuits

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Old 1st December 2005, 10:08 AM   #11
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I ordered 35 chips from Jameco,all the chips worked. It is unlikely that the chips are the problem.
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Old 1st December 2005, 12:58 PM   #12
Nordic is offline Nordic  South Africa
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Can't see anything obvious, unless the chip is blown...
Have you tied removing the chip from the PCB and measuring the voltage at the pin's holes?
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Old 2nd December 2005, 12:09 AM   #13
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Quote:
Originally posted by Nordic
Can't see anything obvious, unless the chip is blown...
Have you tied removing the chip from the PCB and measuring the voltage at the pin's holes?

with the chip in place im getting
pin 10 -20v
pin 9 -20.8v

pin 1 28.2v
pin 4 -28.4v
pin 5 25.2v

*edit* i have no other boards to test. Since i only bought enough to build 2 of didi's amps, with some extra parts.
would a 47uf be that big of a difference vs the 4.7uf digi has listed to test?
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Old 2nd December 2005, 03:29 AM   #14
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would the wattage of the res. @220k matter? i wanted to use dales res. so i had to get a higher wattage 220k it is 2 or 3 watts.... if thats the problem i have phoneix 220k ones on hand.
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Old 2nd December 2005, 04:29 AM   #15
Nordic is offline Nordic  South Africa
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yes 47ufd would be too big, not that I'd think it would stop the sound.

Can you possibly get the circuit diagrame for this one...?

If the resistor doesn't catch fire (lol), it should be ok.
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Old 2nd December 2005, 05:08 AM   #16
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had to do some digging but here is digi's work.
3886IGC protel layout share

and just in case for further looking
PCB based invert 3886 chipamp assembly and comments


digi has his working and i just dont know where i went wrong or if something is dead/wrong.
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