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Old 15th February 2012, 08:34 AM   #1
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Default PS1303 Power Supply improvement?

I bougth one PS1303 13,8V 3AMP power supply and running it to an Tripath TA2020 with good result.I changed the capacitor C1 to 10000uF that i had.
Are there any more improvements i can make?
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Last edited by Solve; 15th February 2012 at 08:55 AM.
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Old 15th February 2012, 08:49 AM   #2
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Old 15th February 2012, 08:52 AM   #3
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Old 15th February 2012, 07:16 PM   #4
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TA2020 is fairly tolerant of power rail noise, what you have will probably be fine... but since you asked.

The PSU uses a half wave rectifier subcircuit, full wave would be better. A voltage regulator IC should be lower noise than that too. C3 could be raised in capacitance and a good brand low ESR capacitor. How will the case lid fit with that big 10KuF cap there? While it will reduce pre-regulated ripple, that much capacitance isn't really needed in front of a regulation circuit for TA2020.

Consider if it's driving 8 ohm speakers, the datasheet claims 88% efficiency @ 12W/8 Ohms. That's less than 1A current. Even if driving 4 ohm load, THD shoots up really fast past about 13W output, still around 1A.

If you made these changes it's quite possible (probable, IMO) the amp won't sound any different (for better or worse).
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Old 15th February 2012, 08:03 PM   #5
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You maybe right, its a bit overkill for this amp to have such big capacitor , i just took what i had.Also the power is enough i suppose but, i tried some different supplyes and
they all sound different.An computer PSU didnt sound good at all.So i just wonder if its any magic in some?Or is it just enough power and a big capacitor?
Just trying do understand the difference.
And the 10K capcitor is standing up now.
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Old 15th February 2012, 08:36 PM   #6
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^ Most likely the bad result with a computer PSU was that being a switching PSU, it introduces more errors. IMO, there's a lot more difference between regulated switching PSU and linear than even between regulated and unregulated linear for a chipamp.

Here's another thing to try - jumper from the 10K uF capacitor straight to the amp to see how that sounds, EXCEPT the voltage is probably too high with that particular transformer with it having enough voltage margin to be 13.8V after regulation. Maybe a couple silicon diodes in series would drop enough voltage.
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Old 15th February 2012, 09:38 PM   #7
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Code:
C3 could be raised in capacitance and a good brand low ESR capacitor.
I changed C3 to an 330uF that i had, dont know if Fujicon is low ESR.

Code:
Here's another thing to try - jumper from the 10K uF capacitor straight to the amp to see how that sounds, EXCEPT the voltage is probably too high with that particular transformer with it having enough voltage margin to be 13.8V after regulation. Maybe a couple silicon diodes in series would drop enough voltage.
It messured 16.8V, a little to much but i understand the idea.
So, a few silicon diodes could drop the voltage, good to know.
Im still an newbie in this.
Thanks for your help.
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Old 15th February 2012, 11:15 PM   #8
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3 silicon diode in series would drop about 0.6V to 0.7V each, bringing 16.8V down to about 14.7V, close enough to the 14.6V limit on the spec sheet... or add a 4th diode to drop to 14.0V. Then again if you're dropping this much voltage you could experiement with a regulator IC too like LM317.

I've never powered a TA2020 with LM317 regulated supply but am happy with a TA2024 amp I paired with one. It seldom consumes more than about 400mA current, I'd expect a 1.5A regulator like LM317 to be enough for a TA2020 provided a decent sized heatsink is on it.
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Old 16th February 2012, 08:09 AM   #9
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Good tip!
Thanks!
What diodes are you using?
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Old 16th February 2012, 11:40 AM   #10
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Changing C2 from 100uF to 1000uF would give you about 10db more power supply ripple
rejection at 100hz but this would also increase the time it would take the power supply to reach the final 13.8V from 0.5 seconds to 5 seconds. (slow start)
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