[sdiy] 8x8 switching matrix
derek at umatic.nl
Tue Jul 14 11:07:51 CEST 2009
Another question about the MT8808, actually it's a couple of questions
but since they both relate to input voltage they are probably the same:
1) "12Vpp analog signal capability": if my system is +/-15v, I know it's
unlikely that a module will send out a rail-to-rail signal, but how
could I protect the CMOS just in case it did?
2) The cross-talk is directly related to the peak-to-peak voltage of the
system. Would people recommend padding/scaling down the input voltage
before it goes through the IC and then adding gain afterwards to reduce
the cross-talk (at the expense of added noise and possibly
distortion/imprecision of the signal)? If so, could anyone point to a
circuit which demonstrates this (simple op-amp stuff I guess)?
Ullrich Peter wrote:
> I used the MT8816 (8x16 in PLCC44) for my universal midi interface (I use it fort he Poly61) - works fine for digital signal and audio but should also suit for video switching. In one application in our company I used it also for mixing signals - but here you can not use the full matrix circuit due to the resulting schematics.
> Prior to this chip we used the MT8804 chips and the MT8812 (8x12). The MT8812 is used in my Casio SK1 midi interface.
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Derek Holzer
> Sent: Monday, July 13, 2009 12:55 PM
> To: Rainer Buchty
> Cc: Synth DIY
> Subject: Re: [sdiy] 8x8 switching matrix
> Hi Rainer,
> just stumbled across the MT series stuff, probably while you were typing
> this! Thanks!
> Out of curiosity, is the MT8806A or similar what Buchla uses in the 210e?
> Rainer Buchty wrote:
>> On Mon, 13 Jul 2009, Derek Holzer wrote:
>>> I know this could be done with a microprocessor and a lot of latching,
>>> but I wonder if there is some specialty IC out there that could do 8x8
>>> signal matrix switching?
>> Does the MT8808 suit your needs?
::: derek holzer ::: http://blog.myspace.com/macumbista :::
---Oblique Strategy # 204:
"What do you do? Now, what do you do best?'"
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