[sdiy] Which programable chip?

[Scott Nordlund]

The DG212 (or whatever similar parts) are more accommodating.  They'll handle +/- 15V with TTL level switching.  No tricks are needed, though it needs +/- 15V power plus 5V and ground, and they're more expensive than the 40xx parts.

----------------------------------------
> From: rtellason at verizon.net
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Which programable chip?
> Date: Thu, 16 Apr 2009 00:56:06 -0400
>
> On Wednesday 15 April 2009 04:34:52 pm Scott Nordlund wrote:
>> Why would you need to run the audio through the processor?
>>
>> If I'm not mistaken, are you wanting to route one input (of 8 total) to one
>> output (of 8 total)? You can do that with 2 4051 multiplexers, and not
>> have to worry about any ADCs or DACs or high speed processors or anything.
>> You only need to send 6 bits to control everything.
>>
>> And if you want to be able to route multiple signals simultaneously, it may
>> be slightly more complicated (depending on whether you want arbitrary
>> routings, etc.)- you may need a crosspoint matrix, even 16 4066 chips (or
>> similar), but it's the same basic idea to use analog switches to do the
>> work.
>
>
> Speaking of which, I've had some idle thoughts now and then about running
> signals through those parts. But you need to worry about signal levels, and
> they probably oughta be kept fairly low, not typical synth levels, but more
> like "line" level as I understand it. And if you want to use those parts
> with their 15V maximum supply voltage and a zero-centric signal level without
> AC coupling you'll need a pair of 7.5V supplies, right?
>
> Have any of you guys done much with this sort of thing?
>
> I'm thinking some signal switching hardware would be a good thing to have...
>
>> ----------------------------------------
>>
>>> From: taciturn_unquiet at hotmail.com
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: RE: [sdiy] Which programable chip?
>>> Date: Wed, 15 Apr 2009 15:06:05 -0500
>>>
>>>> Arduino certainly looks easy to use, but it doesn't seem to have any
>>>> analogue outputs. Is there anything like Arduino that also includes on
>>>> board DACs (at least 12 bit)?
>>>
>>> That's it... there's the problem. I need 8 analog ins and 8 analog outs
>>> and all the switchy bits in between.
>>>
>>> -Ian
>>>
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