[sdiy] SSM2164 last time buys

[Paul Perry]

While on the subject of rail failure, the ris a practical difference
between a rail being "absent from switch on" and "rail fail during
operation".
The two conditions can lead to very different bias conditions, with
fail during operation you can get (for example) transitory
signal inputs outside the (new) voltages to the power supply pins
on the chip.

paul perry Melbourne Australia

----- Original Message ----- 
From: "Colin f" <colin at colinfraser.com>
To: "'Synth DIY'" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, February 28, 2011 10:16 AM
Subject: Re: [sdiy] SSM2164 last time buys


>
>> The first thing I thought of was a relay based solution, but
>> that seemed a bit overkill for one PCB. I was hoping there
>> was something simple that could be built onto a PCB with a
>> few cheap components, rather than a system wide solution.
>
> I'm not sure the problem here is clearly defined.
> Is it a lack of a negative supply when the positive and ground rails are
> present ?
> Is it the presence of input voltages below the level of the absent 
> negative
> rail ?
>
> Cheers,
> Colin f
>
>
>
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> Synth-diy at dropmix.xs4all.nl
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