Timeline for Adjusting the gain in Pre-Built Circuit
Current License: CC BY-SA 3.0
13 events
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Apr 11, 2017 at 8:47 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
Mar 11, 2017 at 18:21 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
Jan 24, 2017 at 15:55 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
Dec 21, 2016 at 11:14 | answer | added | Manuel | timeline score: 2 | |
Dec 20, 2016 at 16:20 | comment | added | Andy aka | I think you may be plugging the output into something that may only have (say) 1 kohm input impedance. Note that these amps have an output impedance of 4.7 kohm thus, you might see a signal reduction (into 1 kohm) of over 13 dB. | |
Dec 20, 2016 at 12:53 | comment | added | user16324 | It isn't quite straightforward thanks to R5(R8), plus the gain setting and EQ are intimately interlinked. Best option is to simulate first, then halve R6/R7 and see the changes. You probably need to double C5,C6, C22,C23 to maintain the LF time constants (correct bass response curve), and you may need to change R5/R8 too. | |
Dec 20, 2016 at 12:49 | comment | added | Bimpelrekkie | I initially thought R28/R18 were responsible for the gain but that doesn't seem to be the case. No those are for biasing, roughly the gain is (R9+R10) / R6. But if you change any of those values then the EQ curve will also change. You would be better off adding an amplifier (without EQ) behind this circuit. | |
Dec 20, 2016 at 12:44 | comment | added | Manuel | There's nothing wrong with per say, it's just quite a bit lower than the rest of the line level input which leads to possible jump scares and possibly angry neighbors when I forget and switch sources. | |
Dec 20, 2016 at 12:43 | comment | added | Vladimir Cravero | What do you mean 'the output is low'? | |
Dec 20, 2016 at 12:35 | comment | added | JIm Dearden | I would have looked at R6/R7 but at 1k0 its already low so at best you might only get another 3dB | |
Dec 20, 2016 at 12:31 | review | First posts | |||
Dec 20, 2016 at 12:35 | |||||
Dec 20, 2016 at 12:30 | comment | added | Manuel | Any EE lesson is of course welcome. I'd love to learn more about how (and why) this works as it does, if that's not asking too much! | |
Dec 20, 2016 at 12:28 | history | asked | Manuel | CC BY-SA 3.0 |