13 Dollars for an electronic switch ?? (was: 4066's. Eat em up, Yum)

[The Dark force of dance]

Y-ellow Y'all.
        I'll join up with the list properly soon. I'm getting a new mail
program that will sort the spam from the real stuff so it'll be less confusing.

In the mean time I'd just like to thank Paul Schreiber publicly for giving
me the opportunity to purchase some of the technology we've been talking
about. I'll be using the Analogue Devices SSM2163 digitally controlled 8 X 2
Mixer chips. 4 of 'em to be precise. This will give main/monitor bus with
level and balance plus 2 FX sends with level and balance. Killing nearly all
the birds with just 4 stones. (as it were) Of course the problem there is
that it forces me to drive the system with a micro but them's the breaks.
I'll be attempting to use an ATMEL AT89C2051 for the first time. Out of
interest, these little guys are MCS51 type cores in a 20 pin package with
flashRAM for program storage. 2K thereof. Oh and they run @ 24Mhz.

Paul's also getting me some of the other chips from Harris previously
mentioned. It would seem that most of these have comparable specs to the
DG201 family. Which seem to be the standard in high-end analogue switches.
Whilst the transfer function doesn't seem to be all that great, and
certainly not as great as using a relay, they're almost identical to the
DG201 and leaps and bounds ahead of the 4066. Also it would seem that the
ones I already have, which I've used for MIDI routing, are the only ones of
the family which are less than suitable in an audio application. The
74HCT22106 is an 8 X 8 X 1 crosspoint switch which has an absolute maximum
supply rating of 11 volts. It's on resistance varies greatly and non
symmetrically with input voltage, power supply voltage and temperature. It's
still better than a 4066 but there's even better to come.

Harris 22M3493 12 X 8 X 1  BiMOS-E Crosspoint switch
Harris 22M3494 16 X 8 X 1  BiMOS-E Crosspoint Switch
Harris CD22101/CD22102 CMOS 4 X 4 X 2 Crosspoint switch with control Memory

All of the above have far better characteristics. The Supply voltages range
from a maximum of 16 volts to 20 volts. Check the data sheets for specific
details. Whilst the on resistance isn't perfect, it only varies about 40
ohms max and is largely symmetrical around the centre. Unlike the 4066, the
characteristics improve with higher supply voltages. So running these guys
at their maximum smooths them out rather well. And like I said, the total
characteristics are comparable to the DG201.

So that's my findings thus far. I'll get the opportunity to use them soon
and let you know how they perform.

Hope that helps.

Be absolutely ICebox.
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