[sdiy] Best way to limit current through an analog switch IC?

[Paul Glass-Steel]

The switching function is ancillary to the module's primary function as a
window comparator; if I have to choose between bidirectional or pitch-CV
friendly, I'll take bidirectional. But, if I can have both at the cost of
some complexity - it's middling-complex already, so what's a bit more,
perhaps?

On Tue, Jul 2, 2024 at 2:52 PM Mattias Rickardsson <mr at analogue.org> wrote:

> Does it have to be bidirectional?
> Feels like this is the trickiest part to get around. :-)
>
> /mr
>
>
> Den tis 2 juli 2024 17:08Paul Glass-Steel via Synth-diy <
> synth-diy at synth-diy.org> skrev:
>
>> Hello all,
>>
>> I'm working up a bi-directional switch module around the TI MUX507 analog
>> switch IC. The datasheet lists the maximum IO current as 30mA. I'd like to
>> proof the switch against the fault condition of having the IO spanning
>> my +/- 12V rails, however remote that mis-connection might be.
>>
>> By Ohm's law, the bulk series resistor needed would be 820R 1W, rounding
>> to common values. I imagine that resistance would be high enough to audibly
>> affect pitch CV. Is there a better or more elegant solution to limit the
>> current?
>>
>> Thanks,
>> -Paul
>>
>>
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