Chipamp won't work! AARGH!

Spasticteapot · 27th October 2006, 08:09 PM

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?

Spasticteapot · 27th October 2006, 08:11 PM

Pic #2:

Netlist · 27th October 2006, 09:28 PM

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

Spasticteapot · 27th October 2006, 09:30 PM

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.)

Netlist · 27th October 2006, 09:33 PM

Yes, a good soldering iron is a Diy-er's best friend. You invest once, you have lifetime pleasure.

/Hugo

drummer_Dave · 27th October 2006, 09:33 PM

Just remember if you are measuring the traces with an ohm meter MAKE SURE THE POWER IS OFF!!!!!!!!

Netlist · 27th October 2006, 09:34 PM

Good point; and caps discharged.

/Hugo

v-bro · 27th October 2006, 09:41 PM

Am I wrong or is one of them two larger electrolites connected the wrong way'round?

v-bro · 29th October 2006, 01:33 PM

And?

karma · 29th October 2006, 01:39 PM

it would have been faster to p2p it

27th October 2006, 09:41 PM	#8
v-bro diyAudio Member Join Date: May 2006	Am I wrong or is one of them two larger electrolites connected the wrong way'round? __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

29th October 2006, 01:33 PM	#9
v-bro diyAudio Member Join Date: May 2006	And? __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

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27th October 2006, 09:28 PM	#3
Netlist diyAudio Moderator Join Date: Jan 2003	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

27th October 2006, 09:33 PM	#5
Netlist diyAudio Moderator Join Date: Jan 2003	Yes, a good soldering iron is a Diy-er's best friend. You invest once, you have lifetime pleasure. /Hugo

27th October 2006, 09:33 PM	#6
drummer_Dave diyAudio Member Join Date: Oct 2006	Just remember if you are measuring the traces with an ohm meter MAKE SURE THE POWER IS OFF!!!!!!!!

27th October 2006, 09:34 PM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	Good point; and caps discharged. /Hugo

29th October 2006, 01:39 PM	#10
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	it would have been faster to p2p it

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