Class AB Audio Amplifiers - Page 9

penderaudio · 23rd February 2013, 12:26 AM

Cool someone else is gonna do the same build as me, 2 LM49810s and an SMPS2000R.
Cristi you mentioned in a e-mail a few days ago to use CLC filter for the driver stage. I didnt see anything in the user manual about this. Can you explain or show me a diagram for what needs to happen with this?

Thanks

Cristi · 23rd February 2013, 07:39 PM

Since both the power stage and driver stage are supplied from the same output of a regulated SMPS, the driver stage is better to be additionally filtered with one inductor on each rail and capacitors to GND. a series inductor with two capactitors to GND forms a PI filter: Capacitor-input filter - Wikipedia, the free encyclopedia this should be tunned to attenuate furthermore the remaining ripple of the smps. note that since the SMPS2000R switching frecv. is variable, so does the ripple freq. so the filter must be tuned to attenuate the ripple with the freq which match the switching frecquency at low-load when the amplifier plays low volume.

penderaudio · 6th March 2013, 12:22 AM

Hmmmm.... Sounds a bit past my knowledge level. I might just do 2 TA3020v4 in BTL mode. Will be about the same price.

Cristi · 15th March 2013, 06:29 PM

Indeed, and Each TA3020v4b can deliver more than twice the power of a single LME49810-500W amplifier, not to mention the increased efficiency, lower size and lower weight. the sound quality is similar when the amplifier is supplied from common available sources or not very expensive and efficient speakers are used to make the difference.

since this forum is not always accessible from my location, I set-up a small forum on the connexelectronic domain, don't be shy and click: Forum Connexelectronic • Index page

23rd February 2013, 07:39 PM	#82
Cristi diyAudio Member Join Date: Dec 2008 Location: Shenzhen	Since both the power stage and driver stage are supplied from the same output of a regulated SMPS, the driver stage is better to be additionally filtered with one inductor on each rail and capacitors to GND. a series inductor with two capactitors to GND forms a PI filter: Capacitor-input filter - Wikipedia, the free encyclopedia this should be tunned to attenuate furthermore the remaining ripple of the smps. note that since the SMPS2000R switching frecv. is variable, so does the ripple freq. so the filter must be tuned to attenuate the ripple with the freq which match the switching frecquency at low-load when the amplifier plays low volume. __________________ www.connexelectronic.com complete assembled amplifier and SMPS

15th March 2013, 06:29 PM	#84
Cristi diyAudio Member Join Date: Dec 2008 Location: Shenzhen	Indeed, and Each TA3020v4b can deliver more than twice the power of a single LME49810-500W amplifier, not to mention the increased efficiency, lower size and lower weight. the sound quality is similar when the amplifier is supplied from common available sources or not very expensive and efficient speakers are used to make the difference. since this forum is not always accessible from my location, I set-up a small forum on the connexelectronic domain, don't be shy and click: Forum Connexelectronic • Index page __________________ www.connexelectronic.com complete assembled amplifier and SMPS

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23rd February 2013, 12:26 AM	#81
penderaudio diyAudio Member Join Date: Oct 2005	Cool someone else is gonna do the same build as me, 2 LM49810s and an SMPS2000R. Cristi you mentioned in a e-mail a few days ago to use CLC filter for the driver stage. I didnt see anything in the user manual about this. Can you explain or show me a diagram for what needs to happen with this? Thanks

6th March 2013, 12:22 AM	#83
penderaudio diyAudio Member Join Date: Oct 2005	Hmmmm.... Sounds a bit past my knowledge level. I might just do 2 TA3020v4 in BTL mode. Will be about the same price.