| Electronics > Beginners |
| AB-class amplifier schematic analysis & optimization |
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| Alex Nikitin:
--- Quote from: Zero999 on May 23, 2019, 11:31:59 am ---No doubt it can be done, but why bother? There are far more suitable solutions which are far more stable and are better suited to the application. --- End quote --- The reason is very simple - the sound quality when used with various real world headphones. Cheers Alex |
| Zero999:
--- Quote from: Alex Nikitin on May 23, 2019, 12:29:14 pm --- --- Quote from: Zero999 on May 23, 2019, 11:31:59 am ---No doubt it can be done, but why bother? There are far more suitable solutions which are far more stable and are better suited to the application. --- End quote --- The reason is very simple - the sound quality when used with various real world headphones. Cheers Alex --- End quote --- Too bad if there's a risk of RFI, especially with long cables. :palm: There are far more suitable solutions, offering the same/better sound quality and a much lower risk of turning into an unintentinal radio transmitter. |
| dietert1:
When i read claims that an amplifier sounds different, my first thought is: Maybe it got a problem. Any amplifier with low output impedance, a reasonably flat frequence plot and less than 0.1 % THD up to 10 KHz at somewhat elevated output levels sound the same even for a trained listener. That amplifier is easy to build using modern parts. Most tube amplifiers sound "interesting" since they don't fulfil these criteria (higher output impedance and THD more like 1 or 2 %). Higher THD simulates higher sound level.. Regards, Dieter |
| Zero999:
--- Quote from: dietert1 on May 23, 2019, 01:38:08 pm ---When i read claims that an amplifier sounds different, my first thought is: Maybe it got a problem. Any amplifier with low output impedance, a reasonably flat frequence plot and less than 0.1 % THD up to 10 KHz at somewhat elevated output levels sound the same even for a trained listener. That amplifier is easy to build using modern parts. Most tube amplifiers sound "interesting" since they don't fulfil these criteria (higher output impedance and THD more like 1 or 2 %). Higher THD simulates higher sound level.. Regards, Dieter --- End quote --- I mostly agree but beware of THD figures which don't always tell the full story. Some types of distortion are noticeable at low levels of THD, such as crossover distortion, whilst others such as slew rate limit distortion aren't noticeable until much higher THD numbers. In this case, my suspicion is the LM7171 could be ringing at certain frequencies which could be seen as sounding brighter, boosting treble response. |
| Alex Nikitin:
--- Quote from: dietert1 on May 23, 2019, 01:38:08 pm ---When i read claims that an amplifier sounds different, my first thought is: Maybe it got a problem. Any amplifier with low output impedance, a reasonably flat frequence plot and less than 0.1 % THD up to 10 KHz at somewhat elevated output levels sound the same even for a trained listener. That amplifier is easy to build using modern parts. Most tube amplifiers sound "interesting" since they don't fulfil these criteria (higher output impedance and THD more like 1 or 2 %). Higher THD simulates higher sound level.. Regards, Dieter --- End quote --- Let's say my experience is different from yours. Cheers Alex |
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