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Analog switch recommendation?

C

Chris Carlen

Jan 1, 1970
0
Greetings:

I have to make a general purpose "switch closure" gadget. I will make
one with a relay, which simply has a pair of contacts across a BNC
connector. What in the heck is this for, you might wonder?

In one case, it is used to reset a charge amp. Usually, the relay is
fast enough, since it happens only a few times a second. But I want to
make a solid state one, though that involves issues that a relay avoids,
such as voltage ranges, polarities, on resistance, off resistance, etc.

Perhaps a simple HC4066 will do here, but it appears to be able to work
with positive signals only, which may limit it's usefulness and make it
more liable to getting broken by scientists who tend to just connect
cables to things and not think too much about what's inside.

So the basic idea is a connector with a control input, TTL style, and
one to three connectors wired to the "switch" so that at minimum, I will
have a closure across one connector, but a little more fancy would be to
have an SPDT switch one connector between two others.

I would prefer to have an allowed voltage range of +/- 15V or so, up to
30mA. I looked a little at Crydom SSRs, but they appear to force one to
choose between switching AC or DC signals, and I'd rather have this be
unconstrained.

Any device recommendations?


Thanks for input.


Good day!

--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
[email protected] -- NOTE: Remove "BOGUS" from email address to reply.
 
J

John Devereux

Jan 1, 1970
0
John Larkin said:
The "AC" ssr's - at least the photofet kind, not the triacs - switch
AC or DC just fine. They come up to 400 volts and are fairly rugged.
They're kinda slow, but still faster than a relay, have zero offset,
and are fully isolated and don't even need power other than the TTL
drive.

I agree, these are great devices.

Also Chris might want to look at the analog devices ADG451 if he wants
more than one switch.

+/- 15V signals, 4 ohm, quad SPST.
 
C

Chris Carlen

Jan 1, 1970
0
John said:
I agree, these are great devices.

Also Chris might want to look at the analog devices ADG451 if he wants
more than one switch.

+/- 15V signals, 4 ohm, quad SPST.



Yes that's perfect!

Thanks.

--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
[email protected] -- NOTE: Remove "BOGUS" from email address to reply.
 
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