Timeline for What is the difference in performance of a JFET current source to a 741 Op Amp current source?
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Aug 20, 2023 at 20:40 | comment | added | Marcus Müller | @sstobbe but to be specific, that's mainly a problem for the ancient (50 years!) 741. Modern opamps with modern MOSFETs with small gate capacitance will have no real problem achieving higher stability far far far above kHz ranges. | |
| Oct 11, 2017 at 6:13 | answer | added | next-hack | timeline score: 5 | |
| Oct 11, 2017 at 2:16 | comment | added | sstobbe | Opamp will perform better at DC, JFET will perform better in kHZ and up | |
| Oct 10, 2017 at 22:12 | comment | added | The Photon | @whatwhatwhat, another word for ease of use in this case is "precision". | |
| Oct 10, 2017 at 21:38 | comment | added | Transistor | In the op-amp circuit the inverting input is at virtual ground. No matter what you do with the pot the same current will flow through the input resistor to virtual ground and also through the feedback pot. If the images were too big then you should scale them down. | |
| Oct 10, 2017 at 21:25 | comment | added | whatwhatwhat | @Trevor So just ease-of-use? | |
| Oct 10, 2017 at 20:48 | history | edited | Trevor_G | CC BY-SA 3.0 |
added 170 characters in body
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| Oct 10, 2017 at 20:47 | comment | added | Trevor_G | Biggest difference is the op-amp gives you a circuit that is defined by simple resistance values, whereas JFET circuit is dictated by the less well defined JFET component properties. | |
| Oct 10, 2017 at 20:46 | comment | added | whatwhatwhat | @Transistor the images were too large (>2mb) | |
| Oct 10, 2017 at 20:45 | comment | added | Transistor | If you want good answers I suggest you embed the images in the post. Many of us won't bother to follow links. | |
| Oct 10, 2017 at 20:39 | history | asked | whatwhatwhat | CC BY-SA 3.0 |