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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd April 2018, 01:18 PM   #411
swank42 is offline swank42
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Join Date: Oct 2017
I have a question about power used. The FX502SPRO is quite powerful for my high-efficiency speakers, so in order to have a usable volume range, I turn down the output of my Chromecast so that I can use more range on the FX502SPRO's volume knob.

2 questions = does that mean that the amp is using more power? Does it mean the 3250 chip will generate more heat?

I don't know if the answer is yes to both of those or if the chip is at the same power and the volume pot is just cutting the output.
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Old 22nd April 2018, 01:29 PM   #412
irribeo is offline irribeo  Netherlands
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what value resistors are around the opamps ? do the opamps add gain ?
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Old 22nd April 2018, 01:34 PM   #413
chermann is offline chermann  Austria
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Quote:
Originally Posted by swank42 View Post
I have a question about power used. The FX502SPRO is quite powerful for my high-efficiency speakers, so in order to have a usable volume range, I turn down the output of my Chromecast so that I can use more range on the FX502SPRO's volume knob.

2 questions = does that mean that the amp is using more power? Does it mean the 3250 chip will generate more heat?

I don't know if the answer is yes to both of those or if the chip is at the same power and the volume pot is just cutting the output.
hi swank42

i think you are too afraid about the heat of this amp. general this chip has a thermal and OVC (over current protection) circuit implemented! so dont worry.

the amps job is to amplifie the level of his input to a regulated (volume knob) gain. depending of the voltage of psu and the max technical requiremnt of this amp you get more or less the possible "power" - if the psu keeps stable.


the position of the volume knob or your volume level of the amps input is not releated to the power. it should give you a wider range for adjust your needed volume during playing music.
youknow. the volume knob of the fx502spro is very sensitive, that means little movement of this knob is generating a big step louder.


clear?
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Old 22nd April 2018, 01:43 PM   #414
chermann is offline chermann  Austria
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Quote:
Originally Posted by irribeo View Post
what value resistors are around the opamps ? do the opamps add gain ?
hi

yes you requested this at page 31 #310
..but actually try to keep this because of no practice in soldering in smd.
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Old 22nd April 2018, 02:01 PM   #415
irribeo is offline irribeo  Netherlands
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I do tend to look at Valverde (or Rodriguez) sprinting uphill, although I personally need to step off my 27 gear mountainbike on some of the Belgium hills that hardly slows down those two Spanish.
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Old 22nd April 2018, 02:15 PM   #416
chermann is offline chermann  Austria
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Quote:
Originally Posted by irribeo View Post
I do tend to look at Valverde (or Rodriguez) sprinting uphill, although I personally need to step off my 27 gear mountainbike on some of the Belgium hills that hardly slows down those two Spanish.
aaahh...your are a cyclist too...
its recording on my HDD of my hd SAT reciever....
garden and family is in a parallel process
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Old 22nd April 2018, 02:25 PM   #417
chermann is offline chermann  Austria
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Quote:
Originally Posted by chermann View Post
i have just a smal room with smal speakers and actually i play some more punchy music..........zhu....gogo penguin...

but i think i psuh the amps not so hard.

yesteday i forgott to low down the level at tidal and i played "a hundred moons" by gogopenguin, tidal level nearly max = 92 and the fx502s was set about 12 o clock --> at second 11 of the title the amp shut down on the left channel and push down the right channel -->with error led blinking. after switch off and 5 seconds wait it works again.

yes i can feel the difference slightly.
happend again - amp 2 BB2134 but exactly some as obave discribed
but other channel shut down = right channel

switch of ...3 sec waiting.....and go ahead with volume 83 volume at tidal... !


nice afternoon...
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Old 22nd April 2018, 06:43 PM   #418
chermann is offline chermann  Austria
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Default ..psu check...

Hi

i used the "stronger" (current max 16A). its a psu with 15V:
corally 250Watt psu
corally netzteil 250W - Google Search

my impression is that this psu really give me exact the same volume of music and a sound with more "darkness". the disadvantage of this psu is that the fan is real loud. so i have to play tiltes with more action

i tryed to push the amp as hard as described before. the amp is not switching of --> so the previous shut down was a weakness of the original psu.



Last edited by chermann; 22nd April 2018 at 06:46 PM.
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Old 23rd April 2018, 05:44 AM   #419
chermann is offline chermann  Austria
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Default ...smsps measurements...

Good morning

yesterday i checked this RC smps shortly. recommended 15V /16Amax

my loadbox has 3x4,2 Ohm /100W resistors = 1,4 Ohms overall resistor.

10,53 Ampere at 14,74Volt is fine. no noise measurements with scope.

the fan is very loud.
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File Type: jpg SMPS_about 1_4ohms_2.jpg (222.3 KB, 284 views)

Last edited by chermann; 23rd April 2018 at 05:51 AM.
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Old 23rd April 2018, 07:00 AM   #420
irribeo is offline irribeo  Netherlands
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How to make noise with a 10 watt amplifier
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