Timeline for Choose the better values (in terms of range) for resistors in this non-inverting op-amp circuit
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Jun 15, 2015 at 11:07 | vote | accept | Mister D | ||
| Jun 4, 2015 at 18:59 | history | edited | Mister D | CC BY-SA 3.0 |
added 230 characters in body
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| S Jun 4, 2015 at 17:04 | history | suggested | Peter Mortensen | CC BY-SA 3.0 |
Copy edited (e.g. ref. <http://english.stackexchange.com/questions/2429>). Dressed a naked link.
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| Jun 4, 2015 at 16:57 | review | Suggested edits | |||
| S Jun 4, 2015 at 17:04 | |||||
| Jun 3, 2015 at 22:16 | answer | added | leftaroundabout | timeline score: 5 | |
| Jun 3, 2015 at 14:34 | history | tweeted | twitter.com/#!/StackElectronix/status/606106613695545344 | ||
| Jun 3, 2015 at 14:07 | comment | added | Bimpelrekkie | By higher I mean that the chance of having oscillations increases as the value of the resistors in crease. The actual value of resistor above which oscillations can occur depend on the opamp so there is no absolute value. It depends on the properties of the opamp you find in the datasheet. | |
| Jun 3, 2015 at 13:41 | answer | added | Peter Smith | timeline score: 5 | |
| Jun 3, 2015 at 13:26 | answer | added | Olin Lathrop | timeline score: 21 | |
| Jun 3, 2015 at 13:15 | comment | added | Mister D | @Rimpelbekkie I can't understand, in that application, when a value should be considered "higher". 100 ohm compared to 10 ohm? 10Kohm compared to 1Khom? And so on. | |
| Jun 3, 2015 at 13:12 | comment | added | Bimpelrekkie | Also, with higher value resistors the circuit might become unstable and could oscillate. You can prevent that by adding a small capacitor across R2. In practice, the resistors will be between a few hundreds of ohms upto 1 Mega ohm. | |
| Jun 3, 2015 at 13:11 | comment | added | Mister D | Don't you worry: thank you, anyway, for your simple answer :) | |
| Jun 3, 2015 at 13:05 | comment | added | brhans | I know someone's going to write a good long detailed answer to this, but short & sweet: your opamp has to source/sink the current through those resistors, so low values = high current. But, resistors cause noise - and that noise is proportional to the value of the resistance. So trade-off. I'm sure there are other considerations, but those are the first which spring to mind. | |
| Jun 3, 2015 at 13:01 | history | asked | Mister D | CC BY-SA 3.0 |