Blown TAA4100A AMP9

[benedums]

I assembled my AMP9 according to the instructions and with a little help from this forum for a few unknown resistors.

First try at powering it up and nothing happened (I was using a 12V 12.5A AC-DC power supply), checked the +5V out and nothing.
Then thinking my PS might be at fault I decided to try AC and hooked up pins 2 & 3 of J5 to AC, flipped the switch and BAM! a big chunk of the chip went flying across the room...

Now bare in mind this is my first crack at building any electronic device like this so I'm pretty sure I did something wrong.

On another thread I found it mentioned something about hooking up the power wrong. (that's possible but I thought I had it right).

http://www.41hz.com/forums/topic.asp?TOPIC_ID=336

Obviously I will need another chip, but I would like to figure out what I did wrong so if you have any suggestions on troubleshooting I would appreciate it.

Thanks,




Sailin

[Niiico]

I hope I misunderstood, but did you write you connected AC... 110V?!!!
If not, you may have soldered diodes the wrong way.

[benedums]

after checking out the AC transformer I had rigged up I believe the board may have gotten a full 115AC (in the US). bad switch or wiring inside box the transformer was in...

I checked all of the diodes and they appear to be in correctly, so I can only assume that I zapped the thing.

If indeed, in my carelessness to connect everything, I did supply the board with a full 115AC is there any chance any of the components on the board still work?

from the looks of it nothing seems to be burnt and or cracked other than the chip.

[Saturnus]

Uhm no, apart from a few lucky resistors, I recon you have a small smelly pile of garbage on your desk. I'm pretty sure that at least some of the PCB lead have been burned through. But it's possible that through some miracle that something did indeed survive. You'll basically have to desolder every single part and test them indidually.

I suggest getting a new kit, and try again, though.

[V-bro]

Allways measure before you connect, even a $5 DMM from the supermarket works good enough for this....

[markroussey]

Another tidbit to be aware of: the chip doesn't even turn on until you supply 10V DC or so; I thought I had a problem when I put in 5V AC (which produced about 8.5V DC), with no results, but the chip requires a certain minumum.

Also, beware "variable" voltage A.C. sources; mine produced a horrendous ground loop, feeding 5-6A through the ground plane. Solution: don't connect the A.C. ground; keep it isolated.