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| 05:44.51 | monkey_ | sup? |
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| 12:01.55 | pingbat | hey all |
| 12:02.37 | pingbat | is there such a thing as a chip that can create a link between two arbitrary pins? |
| 12:03.55 | pingbat | kind of like an array of jumper pins but on a chip and programmable |
| 12:05.12 | pingbat | if there is what is it called? |
| 12:10.47 | roxfan | cpld/fpga? |
| 12:11.48 | pingbat | well, that would be absolute overkill |
| 12:12.23 | pingbat | i have a couple of opamps and i need to be able to dynamically reconfigure their arrangement |
| 12:12.54 | Zoiah | I think that's what programmable logic (the pl part of cpld) is for. |
| 12:13.16 | roxfan | http://en.wikipedia.org/wiki/Programmable_Array_Logic |
| 12:13.20 | roxfan | maybe this |
| 12:13.30 | Zoiah | Yes. |
| 12:13.34 | pingbat | i am not after logic |
| 12:13.39 | pingbat | just the programmable |
| 12:13.39 | Zoiah | http://en.wikipedia.org/wiki/Programmable_logic_device has a list. |
| 12:13.50 | pingbat | like a programmable switch |
| 12:14.02 | roxfan | well, you can use logic elements for that |
| 12:14.44 | pingbat | well, yes, but they won't work well for the analogue signals i want to manipulate with the op-amps |
| 12:15.47 | pingbat | does that make sense? |
| 12:15.59 | Zoiah | Have you tried? |
| 12:17.09 | pingbat | no, but it won't work, i need to pass a wide range of voltages and frequencies through it. |
| 12:17.20 | Zoiah | How wide? |
| 12:17.32 | pingbat | +- 30 |
| 12:17.34 | pingbat | ideally |
| 12:17.48 | Zoiah | 30 what? |
| 12:17.52 | pingbat | V |
| 12:18.08 | pingbat | and frequencies up to 1Mhz |
| 12:21.26 | roxfan | hmm if you need analog then maybe a transistor array would work? |
| 12:24.27 | Zoiah | http://en.wikipedia.org/wiki/Crossbar_switch ? |
| 12:25.20 | roxfan | this one seems to be mechanically configurable |
| 12:26.49 | pingbat | is the crossbar analogue? |
| 12:28.55 | Zoiah | It's mechanical. |
| 12:29.06 | Zoiah | It's how telephonelines used to be connected. |
| 12:29.24 | pingbat | they also seem to do silicon ones |
| 12:32.52 | pingbat | http://en.wikipedia.org/wiki/RF_switch_matrix |
| 12:34.33 | pingbat | maybe a couple of analogue multiplexer chips? |
| 12:34.37 | roxfan | http://www.analog.com/en/switchesmultiplexers/analog-crosspoint-switches/ad75019/products/product.html |
| 12:35.42 | pingbat | that looks good! |
| 12:39.27 | pingbat | thanks guys |
| 12:40.21 | roxfan | check also "analog switches", they seem to be cheaper but don't have cross arrangement |
| 12:51.12 | pingbat | i don't need anything like that frequency either |
| 12:51.26 | pingbat | ok, thanks very much |
| 13:42.07 | likewise | pingbat 4093 or 4066 part |
| 13:42.53 | likewise | pingbat: http://www.standardics.nxp.com/products/hef/datasheet/hef4066b.pdf |
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| 14:40.12 | chouimat | morning |
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| 16:06.35 | T0mW | GPSFan: I have heat! |
| 16:08.40 | chouimat | yay! |
| 16:09.45 | T0mW | We hooked everything up Thursday, had some issues that we corrected on Friday and it has been 72 degrees here in the house since. It is so nice waking up to warm floors. |
| 16:10.52 | T0mW | I still need to put radiant barrier up under the PEX heating loops as the crawlspace is also toasty-warm. :( |
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