Timeline for Voltage protection of PNP Open-Collector Pull-Down Resistor Circuit
Current License: CC BY-SA 3.0
17 events
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| Jun 11, 2020 at 15:10 | history | edited | CommunityBot |
Commonmark migration
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| Apr 13, 2017 at 12:33 | history | edited | CommunityBot |
replaced http://electronics.stackexchange.com/ with https://electronics.stackexchange.com/
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| Apr 10, 2017 at 19:17 | vote | accept | Discbrake | ||
| Feb 3, 2017 at 1:41 | history | edited | Discbrake | CC BY-SA 3.0 |
Adapted the parameters
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| Feb 2, 2017 at 8:49 | comment | added | Discbrake | @BruceAbbott Thank you for the comment. Unfortunately I have never worked with sensors before, so I am in the dark about most stuff such as TTL and Digital Inputs. I created a new Update section to my question, could you please check if the circuit and its results make more sense now? Also, are the +-250uA input current maximal levels or should I try to provide a constant level of e.g. +250uA in the whole operational range between 0V und 4.5V? | |
| Feb 2, 2017 at 8:45 | history | edited | Discbrake | CC BY-SA 3.0 |
Added box in second circuit
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| Feb 2, 2017 at 8:25 | history | edited | Discbrake | CC BY-SA 3.0 |
Updated the new schematic
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| Feb 2, 2017 at 8:18 | history | edited | Discbrake | CC BY-SA 3.0 |
Added a circuit
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| Feb 2, 2017 at 7:44 | answer | added | rioraxe | timeline score: 3 | |
| Feb 2, 2017 at 2:44 | comment | added | Bruce Abbott | "to be more precise the NI 9401" - The NI 9401 has TTL level digital inputs, with input current specified at +-250uA between 0V and 4.5V. If that really is what you have then I suspect it may need much lower driving impedance than 100k (250uA*100k = 25V!). | |
| Feb 2, 2017 at 1:24 | history | edited | Discbrake | CC BY-SA 3.0 |
Updated the schematics
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| Feb 2, 2017 at 1:18 | history | edited | Discbrake | CC BY-SA 3.0 |
edited body
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| Feb 2, 2017 at 1:03 | history | edited | Discbrake | CC BY-SA 3.0 |
Corrected the last schematic
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| Feb 1, 2017 at 20:52 | comment | added | D.A.S. | the Panasonic sensor provides redundant complementary switched low impedance outputs for Dark and light sensing operating over a wide range of 5 ~24V. Why introduce another supply of 10 15 to 24V with such uncertainty unless it could not be avoided, then introduce a messy diode resistor circuit that raises the resistance and thus lowers the immunity to noise? i.e. why not use 5v low impedance switches and redundancy? | |
| Feb 1, 2017 at 20:42 | comment | added | D.A.S. | We're not sure if you are asking the right questions since the design requirements, all the fault conditions and test requirements are not clear. IT is a simple voltage switch with uncertainty on layout EMI problems and noise immunity needed. There is insufficient clarity need to define what is needed for all environments and possible fault conditions and all Input/function/output and environmental stresses and fault requirements ought to be summarized. | |
| Feb 1, 2017 at 20:32 | comment | added | 12Lappie | I don't feel like reading through all this. | |
| Feb 1, 2017 at 20:27 | history | asked | Discbrake | CC BY-SA 3.0 |