Bachmann DCC chip failure

[ColinB]

I am wondering if someone can possibly help with this issue. I fitted a right angled 6 pin Bachmann DCC chip to one of my converted OO gauge locos (reason it was the only one that fitted). It ran perfectly on DCC, and then I thought I would try it on DC, the chip is supposed to work in both modes. It ran for 30 seconds and then died. When I opened up the loco there was a burnt smell and when I now connect it to DCC I get a short. Obviously the decoder is dead, but how did I manage to blow it up.  The only thing I can think is that the controller an old H&M one gave unregulted DC with a peak voltage that was greater than the DCC IC was rated at. Has anyone any experience of this?

[ColinB]

Just tried with a new decoder and it works OK. So must have been the H &M controller, I am assuming that the peak voltage, even though rectified AC was too high for the input stage of the decoder, I will put some smoothing capaciters in my H & M controller.