Bugle smoke test yeild smoke!!

Julien43 · « **on:** 8 Sep 2004, 02:22 am »

I'm not sure what I did wrong (other than assemble the kit with one arm), but on first power-up smoke came from under the hood. A visual showed that C7 is toast and I have no idea what else went with it. I am using 2 12v SLAs for power. If anyone has a thought and an extra cap I'd like to try this again

http://gallery.AudioAsylum.com//cgi/gi.mpl?u=3968&f=Burnt-C7.jpg" width=1280 height=960>

Thanks

kylek · « **Reply #1 on:** 8 Sep 2004, 02:51 am »

Are your opamps inserted the right way?

mgalusha · « **Reply #2 on:** 8 Sep 2004, 03:52 am »

I think Kylek is correct, the op amps look like they are in backwards. They may have survived the reversal as I inserted a pair backwards once and they survived.

hagtech · « **Reply #3 on:** 8 Sep 2004, 04:55 am »

They are right. Opamps installed backwards. Probably need new ones. Perhaps new electrolytic caps too. Try testing with opamps removed, make sure power supplies come up ok.

jh

Julien43 · « **Reply #4 on:** 8 Sep 2004, 09:58 am »

I was expecting something more insidious... That really hurts. I have more opamps but I'll have to use a couple of ratshack 'lytic caps. Thanks again!