>-----Original Message-----
>From: Mike Hord [mailto:gaidinmd@HOTMAIL.COM]
>Sent: 23 April 2004 14:36
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE:] Analog switches
>
>
>There are a couple of factors that affect this.
>
>First, the ON resistance of most (inexpensive) analog switches
>is quite high (hundreds of ohms).  The pricier units get that
>value down, but still don't want to pass a lot of current.
>
>Second, the cheaper ones (4061, 4066 etc) require control
>voltages in the range of the signals to be switched.  Want to
>switch a signal that swings to
>+10V?  You need 10V logic, and a 10V supply rail.  Maxim (and others,
>+I'm
>sure) make some that have dual supplies, one for analog and
>one for digital, but those get pricey.
>
>Your best bet is solid state relays.  Jameco (for example) has
>some in the $2-$3 dollar range.  MUCH better than most of the
>analog switch chips.
>
>Mike H.
>

I thought solid state relays were Triac/SCR based and therefore only
suitable for AC?  Or am I way off the mark?

Regards

Mike




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