Timeline for Maximize performance LM386 and 4Ohm speaker
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:32 | history | edited | CommunityBot | replaced http://electronics.stackexchange.com/ with https://electronics.stackexchange.com/ | |
| Jan 5, 2013 at 10:01 | comment | added | jippie | I would design cut off frequency little above the desired frequency so all its harmonics are suppressed. Remember 6dB/octave (or 12dB/octave for 2nd order), so the further apart cut off from your unwanted harmonics, the better the suppression. If open loop gain of LM386 is sufficient, you can simply use that. | |
| Jan 5, 2013 at 7:57 | comment | added | Daniel | @jippie I wanted to get rid of harmonic aliasing, and since my sampling frequency is 80Khz, I thought, in order NOT to attenuate my desired bandwidth (17-18kHz) I'll set the cutoff frequency such that my the desired bandwidth isn't hurt, while the undesired (above 40kHz - Nyquist freq) is attenuated. I guess this isn't a correct design. I will try designing the active design you have suggested. Just to be sure though, the OP-Amp will replace the LM386! is that correct? Can you suggest a specific part for that matter? Thanks! | |
| Jan 5, 2013 at 7:51 | vote | accept | Daniel | ||
| Jan 5, 2013 at 0:11 | comment | added | jippie | Why cut off at 30kHz if you are not interested in anything above 17kHz. Also consider a active filter setup around the opamp. (first hit in search engine, look at the bottom of the page, second order low pass: electronics-tutorials.ws/filter/filter_5.html ) | |
| Jan 4, 2013 at 21:54 | answer | added | markrages | timeline score: 3 | |
| Jan 4, 2013 at 21:41 | history | asked | Daniel | CC BY-SA 3.0 |