Timeline for What is causing this Op-Amp Distortion
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Aug 28, 2017 at 8:18 | comment | added | Jules | @EJP - "cost"? I consider using a 1N4148 a benefit, seeing as it doesn't make sense to buy them in quantities less than a hundred and then I need to store them... | |
| Aug 28, 2017 at 4:42 | comment | added | user207421 | And for the cost of two 1N4148s it's not even worth debating. | |
| Aug 28, 2017 at 0:42 | comment | added | rackandboneman | To save others the datasheet lookup: that OPA2134 has almost twice the slew rate of a TL081 and about 40 times that of a 741 :) Sorry to repeat this but... this circuit can become unstable in many many ways also, since you tend to end up with something that is too slow for its own bandwidth - or that just straddles that line until temperature, transistor selection, or a similar factor changes. Gain >1 at the frequency where 180° phase shift occurs and you've done it... | |
| Aug 27, 2017 at 21:37 | comment | added | ThreePhaseEel | @EJP -- if you want super-low-distortion, yeah, you'll want biasing, but you can make the stage work acceptably well without it (I used this with half an OPA2134 for a school project and that passed our professor's not-quite-golden ears with flying colors.) | |
| Aug 27, 2017 at 21:36 | history | edited | ThreePhaseEel | CC BY-SA 3.0 |
added 74 characters in body
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| Aug 27, 2017 at 20:44 | comment | added | user207421 | You need biassing. These designs have enormous slew-rate requirements across the dead zone of the two output devices. | |
| Aug 27, 2017 at 20:23 | history | answered | ThreePhaseEel | CC BY-SA 3.0 |