Timeline for My Wien bridge oscillator doesn't work, what could the problem be?
Current License: CC BY-SA 4.0
9 events
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| Jun 15, 2022 at 15:20 | comment | added | Audioguru | The RC45568 was first used 48 years ago in 1974 before audio opamps were invented. The NE5532 was invented 5 years later. | |
| Jun 14, 2022 at 19:37 | history | edited | jonk | CC BY-SA 4.0 |
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| Jun 14, 2022 at 19:00 | comment | added | jonk | @SpehroPefhany Thanks. I don't recall using a 4558. But I'll read up on it and compare its datasheet with the two I mentioned. Appreciated! | |
| Jun 14, 2022 at 18:56 | comment | added | Spehro 'speff' Pefhany | +1 The rather common 4558 is a dual LM741 (without the nasty crossover distortion of the LM358/LM324). Quoting TI: "The RC4558 device is a dual general-purpose operational amplifier, with each half electrically similar to the μA741, except that offset null capability is not provided". IIRC, the JRC version was well thought of in some circles for some (audio-related) reason. | |
| Jun 14, 2022 at 16:52 | history | edited | jonk | CC BY-SA 4.0 |
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| Jun 14, 2022 at 16:51 | comment | added | jonk | @Audioguru Thanks. The scope of the above was to demonstrate (1) the use of zeners (as often found being applied) and (2) how a single supply rail might be applied and (3) why a potentiometer may be of interest. I will add a simulation result, though. | |
| Jun 14, 2022 at 16:19 | comment | added | Audioguru | The LM324 and LM358 opamps are noisy and produce crossover distortion. A DC load resistor can be added to convert the class-B output to class-A with heating and no crossover distortion. | |
| Jun 14, 2022 at 10:24 | history | edited | jonk | CC BY-SA 4.0 |
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| Jun 14, 2022 at 10:08 | history | answered | jonk | CC BY-SA 4.0 |