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Class D Switching Power Amplifiers and Power D/A conversion

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Old 2nd January 2013, 08:45 AM   #3131
akraj is offline akraj  Bangladesh
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Hi All:

Can any one tell me the part number of (RS/Digikey) T157-2? Or any other suiatable core for Class D amps?

Thanks in advance.

Raj

Last edited by akraj; 2nd January 2013 at 09:10 AM.
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Old 2nd January 2013, 07:59 PM   #3132
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yes tehenkyou sameer
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Old 3rd January 2013, 05:02 AM   #3133
akraj is offline akraj  Bangladesh
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Unhappy Smoke on my AUD600

Hi Manoj:

Yesterday I powered up my AUD600, Ver1.0. First I tested power board, DC rail was +-42 volt and found 12V DC with respect to GND at bias point.

Connected power to amp board without mounting any IC's and measured voltage, found 6.2 volts (Zener 6.3). TL071-072 had 6 volts of their VCC PINs.

It seemed that both the boards are okay and then I mounted all the IC's and connected all the power connection. Then I heard a pop noise and little smoke from NE555 IC area.

At the same time I saw smoke from IRF630 area (Power Board). There was a bulb (100W) in series with my transformer which flashed out in full. Drawing high current due to short circuit!!!

I measured bias voltage which is 29V with respect to GND, earlier this was 12V. Which part(s) may have been blown?

Can you please let me know which causing this problem? How to check the flaws of amp board? I did not attach those parts which are not recommended for first setup.

Waiting for your help.

Thanks
Raj
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Old 3rd January 2013, 05:32 AM   #3134
manojtm is offline manojtm  India
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Quote:
DC rail was +-42 volt and found 12V DC with respect to GND at bias point.
Quote:
At the same time I saw smoke from IRF630 area (Power Board). There was a bulb (100W) in series with my transformer which flashed out in full. Drawing high current due to short circuit!!!

I measured bias voltage which is 29V with respect to GND, earlier this was 12V. Which part(s) may have been blown?
Hi Raj

BIAS 12v is with respect to -ve supply rail only not GND.Connect 3pin BIAS point to amp board 3 pin
POWER Board AMP PCB
PIN=+12v-------------- +12v
PIN=(S)OC ------------ (S) center PIN
PIN=(-75V)------------ -Ve PIN

Regards
MANOJ
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Old 3rd January 2013, 07:31 AM   #3135
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by manojtm View Post
Hi Raj

BIAS 12v is with respect to -ve supply rail only not GND.Connect 3pin BIAS point to amp board 3 pin
POWER Board AMP PCB
PIN=+12v-------------- +12v
PIN=(S)OC ------------ (S) center PIN
PIN=(-75V)------------ -Ve PIN

Regards
MANOJ

Thanks Manoj.
I will check and will inform you.

Last edited by akraj; 3rd January 2013 at 07:36 AM.
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Old 3rd January 2013, 05:43 PM   #3136
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Hi all
sir manoj
your amp is Q1 steel
i am wating for compelet version
have nice time
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Old 3rd January 2013, 06:20 PM   #3137
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Default thanks to jlester87

Quote:
Originally Posted by jlester87 View Post
I'll gonna share my layout based on IRS900 / IRAUDAMP1.

I put the bias supply onboard and put an external OCP trigger so that the speaker protect will activate in case of short circuit.

Speaker protection circuit included.

Just don't remove my name when you etch the PCB. It gives me the credit for my effort.

Happy new year everyone
HI
thanks for your sharing
why you and other engineer dont creat all things in one board ?
main board dont have OCP ?
for OCP i must creat protection board too ?
thanks
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Old 3rd January 2013, 06:29 PM   #3138
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i dont like jumpers
I think this is beter

Click the image to open in full size.
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Old 3rd January 2013, 06:33 PM   #3139
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Hi Mr jlester87
how can i open this file : OCP Calculation.ms11
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Old 3rd January 2013, 09:13 PM   #3140
CPX is offline CPX  Romania
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Location: Cluj
Hadighorbani:
Use multisim 11 to open that file. Also you have a huge ground loop on that board and no snubers....

Last edited by CPX; 3rd January 2013 at 09:16 PM.
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