[sdiy] SSM2164 last time buys

[David G. Dixon]

> I'll send Oscar five 2164s as a thank you for his pioneering work. :)

You're the man, Tim!

> I would also like to know if a simple resistor would work okay. I
> believe it will. On my first parts list for the Mankato VCF, I
> specified a resettable fuse and protection diode for each rail on the
> power input (totally stole the idea from John Blacet), and the part I
> listed had a fairly high resistance. This affected the rail slightly
> and made the peak to peak outputs a little lower, but caused no
> problems otherwise. I've since specified a part with a much lower
> resistance, but like I say, I'd be interested to see if a simple
> protection scheme would work properly. BTW, how often does this
> problem really happen? I've never really had it crop up and it doesn't
> seem to be a common occurence, so I'm wondering if we aren't hunting a
> mosquito with a bazooka here.

I've made an absolute fetish of these little bastards, and I've only fried
them by doing something stupid (plugging in power cables in the dark --
d'oh!).  However, working towards an entire modular full of them, I have
these visions of something going wrong and every single one of them going
"ffzzzt" all at once.  That would be a bad day.

I'm thinking of cutting the positive rail traces and retrofitting little SMD
1k resistors across the gap.  For my new designs, I'll probably specify a
resistor in the layout (which could be jumpered).