[sdiy] SSM2164 last time buys

[Scott Juskiw]

Interesting idea. That would certainly address the 2164 issue. But I'm not sure what happens when that module is connected to a second module via a patch cord with ground connected at both ends (when the second module has a hardwired ground) under the fault condition.

>> The problem I'm trying to solve is the lack of a negative 
>> supply when ground and positive supply are present. I'd like 
>> to have the positive supply be disconnected if the negative 
>> supply becomes disconnected. And, I suppose, the solution 
>> should also disconnect the negative supply if the positive 
>> supply is not present.
> 
> Why not derive the ground reference from the positive and negative supplies
> ?
> Two resistors and an op-amp.