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Old 27th November 2020, 12:11 PM   #761
JLesterP is offline JLesterP  Philippines
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Quote:
Originally Posted by commstech View Post
Lester, Thank you for investigating. I will try it out
You're welcome.

I'm using these elna silmic ii caps. About the sound, I prefer the nichicon muse, but the silmic might need some breaking-in, also it was recently heated by soldering few minutes ago.
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Old 27th November 2020, 01:43 PM   #762
JLesterP is offline JLesterP  Philippines
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36V supply is also working good on my TPA3255 PFFB config.
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Old 27th November 2020, 02:06 PM   #763
bobo le chat is offline bobo le chat  France
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Hello
I use this same smps from the start, works very well at (40V), it barely heats, 4 to 5 ° C above ambient temperature, ditto for the chokes, 8 for the TPA radiator (domestic use).
I switch to a Connex power supply this afternoon 48V (will be set to minimum), the auxiliary voltage will be used for the potentiometer motor.
Best regards
Roger
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Old 27th November 2020, 02:46 PM   #764
JLesterP is offline JLesterP  Philippines
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Quote:
Originally Posted by bobo le chat View Post
Hello
I use this same smps from the start, works very well at (40V), it barely heats, 4 to 5 ° C above ambient temperature, ditto for the chokes, 8 for the TPA radiator (domestic use).
I switch to a Connex power supply this afternoon 48V (will be set to minimum), the auxiliary voltage will be used for the potentiometer motor.
Best regards
Roger
Yes correct it doesn't heat up at all! Switching frequency is 65kHz, I will check if it produces clean noise floor.

My cheap chinese adjustable smps has a bump on the noise floor (when I checked THD+N of my amp) at around 25kHz. The abletec doesn't have that bump so I know that the smps is the culprit.

I'm using the meanwell LRS-350-36 at 41V DC. VER2923-103KL is only 4.6 deg C above ambient. The heatsink is 9.5 deg C above ambient.
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Old 27th November 2020, 02:51 PM   #765
JLesterP is offline JLesterP  Philippines
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Quote:
Originally Posted by commstech View Post
Lester, Thank you for investigating. I will try it out
I suggest that you change only the 4 input caps near the heatsink as the first step.

This elna silmic ii 10uF caps reduced the ultra low bass from the sound. Also it is very clean sounding. You might like the 22uF nichicon muse more..
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Old 27th November 2020, 04:19 PM   #766
commstech is offline commstech  Singapore
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Oh okay. Initially i was thinking you were referring to the 4 near the input connectors..lol
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Old 27th November 2020, 06:52 PM   #767
AlexScan is offline AlexScan  France
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Lester... the meanwell for the ASR amp is not the good choice, why you don't order a connex SMPS600RS ?

For the silmic you must let him break-in at least 20h minimum... after you can really compare with nichicon muse.
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Old 27th November 2020, 07:10 PM   #768
ppppp is offline ppppp  Slovakia
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Quote:
Originally Posted by JLesterP View Post
You're welcome.

I'm using these elna silmic ii caps. About the sound, I prefer the nichicon muse, but the silmic might need some breaking-in, also it was recently heated by soldering few minutes ago.
Lester, ELNA SILMIC II (brown series RFS) is polarised, it is suited for power supply decoupling, not for signal path DC blocking.
It needs minimum 80 hours of break-in time, and then sounds very nice - when used in analog PSU path. Try it as decoupling cap for 3255's AVDD pin, and/or as supply cap for opamps. Not in signal path.

Edit: Actually you have 10uF value of RFS, which is ideal as bypass cap on your Opamp SMD adapter, between pin 4 and 8 of opamp.

Last edited by ppppp; 27th November 2020 at 07:34 PM.
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Old 27th November 2020, 11:58 PM   #769
turion64 is online now turion64  United States
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Edit: Actually you have 10uF value of RFS, which is ideal as bypass cap on your Opamp SMD adapter, between pin 4 and 8 of opamp.

ppppp: so the cap’s + lead goes to pin 8 and - lead onto pin 4, correct?

Thanks, Pete
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Old 28th November 2020, 01:49 AM   #770
ppppp is offline ppppp  Slovakia
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Correct. And try to make the leads as short as possible. And be patient, give it at least 20 hours as AlexScan said, or as much as 80 hours for total break-in.
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