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Old 27th October 2006, 08:09 PM   #1
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Default Chipamp won't work! AARGH!

My latest attempt at a LM3875 chip-amp still won't work. You can see pictures below. (I'll add the PCB design and notations later.)

Can anyone tell me how I screwed up?
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Old 27th October 2006, 08:11 PM   #2
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Pic #2:
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Old 27th October 2006, 09:28 PM   #3
Netlist is offline Netlist  Belgium
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Really hard to tell but I believe you should try to improve your solder skills.
If the supply voltages are correct, measure every trace with an ohmmeter to make sure everything is conducting the way it should.

/Hugo
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Old 27th October 2006, 09:30 PM   #4
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Quote:
Originally posted by Netlist
Really hard to tell but I believe you should try to improve your solder skills.
If the supply voltages are correct, measure every trace with an ohmmeter to make sure everything is conducting the way it should.

/Hugo

I should also probbably get a better soldering iron tip. Or a better soldering iron. (The crappy PCB does'nt much help, either.)
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Old 27th October 2006, 09:33 PM   #5
Netlist is offline Netlist  Belgium
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Yes, a good soldering iron is a Diy-er's best friend. You invest once, you have lifetime pleasure.

/Hugo
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Old 27th October 2006, 09:33 PM   #6
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Just remember if you are measuring the traces with an ohm meter MAKE SURE THE POWER IS OFF!!!!!!!!
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Old 27th October 2006, 09:34 PM   #7
Netlist is offline Netlist  Belgium
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Good point; and caps discharged.

/Hugo
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Old 27th October 2006, 09:41 PM   #8
v-bro is offline v-bro  Netherlands
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Am I wrong or is one of them two larger electrolites connected the wrong way'round?
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 29th October 2006, 01:33 PM   #9
v-bro is offline v-bro  Netherlands
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And?
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 29th October 2006, 01:39 PM   #10
karma is offline karma  Canada
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it would have been faster to p2p it
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