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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th February 2012, 02:24 PM   #2021
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Hi, col.
Are you going to use the switch on T1? If not, I suggest removing the relay and replace with a diode.
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Old 18th February 2012, 08:06 AM   #2022
cronm is offline cronm  Hong Kong
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Hi, hifimediy.

My T1 V1.2 switch on relay was stick months ago. Can you show me how to replace the relay with a diode?
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Old 18th February 2012, 12:41 PM   #2023
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Quote:
Originally Posted by cronm View Post
Hi, hifimediy.

My T1 V1.2 switch on relay was stick months ago. Can you show me how to replace the relay with a diode?
Sorry for that. This the pads for diode.
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File Type: jpg T1_diode.JPG (75.5 KB, 615 views)
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Old 20th February 2012, 02:10 PM   #2024
cronm is offline cronm  Hong Kong
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Hi, hifimediy.
Thanks for your diagram.
What kind of diode you will suggest? Any part number.
For safety, I want to desolder the switch too. Any comment?
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Old 27th February 2012, 04:43 PM   #2025
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does anybody know roughly how many amps these amps draw at
A. idle?
B. 50% load?
C. 90% load?

i'm looking to get a 2X100 T2 special version with mundorf (i know it's out of stock right now) and am looking at a toroidal transformer that gives upto 36V @ 2.3amps. would this be enough for full load, half load or what?

less powerful amp, i know, but post 1917 shows a T1 (2X50) drawing 2.7W @ idle and says it's not much more for low to medium volume. he says it's running on a 20V supply, so 2.7/20=0.135 amps @ idle (right!?). does power consumption increase exponentially as the volume is turned up, if so what can i expect the draw to be roughly at 50 or 90% load?

sorry, but i'm new to all this, electronics aswell as DIY amps.
just had another search and found 'My Sure 2X100 measures 170ma at 32vdc at idle. Stock. It is 270ma at idle with the mods which include another regulator for the fan and hot running, low value, Wurth XXL coils. I haven't measured again since changing to the Zalman fanless heatsink. That amp was 330ma when playing loudly.'
330ma = 0.33 amps (right!?), so i can expect around that figure from the T2. So, it seems the 36V @ 2.3A toroidal is going to be plenty, even allowing for quite large variations in power consumption from each board. have i answered my own question!?
please confirm knowlegable people! cheers
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Old 1st March 2012, 08:25 AM   #2026
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Quote:
Originally Posted by cronm View Post
Hi, hifimediy.
Thanks for your diagram.
What kind of diode you will suggest? Any part number.
For safety, I want to desolder the switch too. Any comment?
A 8Amp ultrafast diode will be ok, like BYR29, MUR860 etc..
It doesn't matter to keep the switch(useless), or remove it.
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Old 1st March 2012, 08:34 AM   #2027
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Quote:
Originally Posted by reg66 View Post
does anybody know roughly how many amps these amps draw at
A. idle?
B. 50% load?
C. 90% load?

i'm looking to get a 2X100 T2 special version with mundorf (i know it's out of stock right now) and am looking at a toroidal transformer that gives upto 36V @ 2.3amps. would this be enough for full load, half load or what?

less powerful amp, i know, but post 1917 shows a T1 (2X50) drawing 2.7W @ idle and says it's not much more for low to medium volume. he says it's running on a 20V supply, so 2.7/20=0.135 amps @ idle (right!?). does power consumption increase exponentially as the volume is turned up, if so what can i expect the draw to be roughly at 50 or 90% load?

sorry, but i'm new to all this, electronics aswell as DIY amps.
just had another search and found 'My Sure 2X100 measures 170ma at 32vdc at idle. Stock. It is 270ma at idle with the mods which include another regulator for the fan and hot running, low value, Wurth XXL coils. I haven't measured again since changing to the Zalman fanless heatsink. That amp was 330ma when playing loudly.'
330ma = 0.33 amps (right!?), so i can expect around that figure from the T2. So, it seems the 36V @ 2.3A toroidal is going to be plenty, even allowing for quite large variations in power consumption from each board. have i answered my own question!?
please confirm knowlegable people! cheers
Hi, a 36V toroidal transformer is not suitable for T2, we suggest 16V - 22V AC for T2. And 36V @ 2.3amp means the transformer is about 80VA, too weak for a 100W+100W amplifier. I think no less than 240VA will give the best performance.
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Old 1st March 2012, 10:50 AM   #2028
col is offline col  Australia
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Quote:
Originally Posted by hifimediy View Post
A 8Amp ultrafast diode will be ok, like BYR29, MUR860 etc..
It doesn't matter to keep the switch(useless), or remove it.
I used BYV29 it works fine.

cheers,
col.
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Old 1st March 2012, 07:49 PM   #2029
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ok , thanks hifimediy, i'll just stick with the smps300r from your/nicks site.
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Old 2nd March 2012, 12:54 PM   #2030
cronm is offline cronm  Hong Kong
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Thanks hifimediy and col to provide information for T1 repairing.
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