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I was trying to construct a 10x10 cross bar switch using relays -- something like:

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Question: is it possible to construct this by using solid state components (power transistors?) -- and if it is how would one go about doing it?

Would appreciate any pointers.

NOTES:

  1. The target application was to be able to wire together discreet analog components: say OpAms, diodes, transistors
  2. I was trying to build a hybrid analog-digital computer -- just for fun -- where the digital side would wire together the analog components using a crossbar switch. Using relays becomes very expansive very quickly say if I wanted to have a 100x100 crossbar.
  3. An attempt at specs: V=36V, Imax = 10mA R ~= 0 (approaching zero -- a few Ohms should be fine) f ~= 0 Hertz [you switch once every few seconds or minutes] -- Note these are what I think would be ideal, a subset or partially covering set should do for now too
  4. So I the cross-bar or equivalent switching fabric could be an Integrated Circuit
  5. The Analog components (discreete) that the will connected to the switching fabric will include: Resistors, Capacitors, OpAms, Transistors, Diodes, Differential Amps, Voltage Summers (if I remember from my undergrad?)
  6. A typical example of circuit that I want to wire together using such a cross bar is below:

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user1172468
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1 Answers1

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Would appreciate any pointers

The MT8816 is an analogue cross point switch: -

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The ISL59532 is a video cross point switch: -

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Ditto the HA456: -

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There is also the ADV3202: -

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Or, you could just roll your own using analogue switches wired into a matrix.

Andy aka
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  • oh wow -- many thanks -- I was looking at the data sheet of the MT8816 -- does a multiplexed circuit essentially act like a copper wire within its operating region -- forgive the lay speak, it's been a couple of decades since I was in school? – user1172468 Sep 09 '16 at 11:21
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    An analogue switch might have an on-resistance of several ohms to several tens of ohms and an off-resistance of several Mohms so it's not as good as a relay contact. OMRON produce some very nice (and small) solid state relays that are effectively isolated and offer sub-ohm on resistance. – Andy aka Sep 09 '16 at 11:25
  • Several ohms I think would be fine -- what about the inductance (I take it that would be zero for a solid state component) or capacitance – user1172468 Sep 09 '16 at 11:27
  • I also updated the question -- I'm trying to create a system that wires together discrete components for the purposes of a simple analog computer – user1172468 Sep 09 '16 at 11:28
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    It will be low and definitely sub micro henries. Open circuit capacitance can be quite high and this could be a limitation but try finding the OMRON devices I mentioned. – Andy aka Sep 09 '16 at 11:28
  • OMRON link to SSR: https://www.omron.com/ecb/products/pry/114/g3vm_21pr1.html – Andy aka Sep 09 '16 at 11:37
  • saw those -- they are unfortunately price -- Analog Diodes would be cheaper. I would like something more along the lines of MT8816 in terms of price and density – user1172468 Sep 09 '16 at 11:44
  • Try googling "analogue cross-point switch" – Andy aka Sep 09 '16 at 11:56
  • +1 from me for all the hard work you put into that excellent answer – JIm Dearden Sep 09 '16 at 14:59