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Old 11th September 2010, 07:04 PM   #631
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Quote:
Originally Posted by hadita View Post
Could sir b500 & H900 combined with the BTL system because I need a large power for field application recomendations please

thanks
Post #220 in H900 thread.
Regards
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Old 12th September 2010, 06:04 PM   #632
yohnsee is offline yohnsee  Hungary
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Default Problem solved

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Originally Posted by apexaudio View Post
Measure voltages +/-15V, and you must have 500mV on BD241C (thermal diode) on 25 deg, and drop 2mV per deg. First comparator (400mV) turn on 24V to fun, and second (350mV) cut out speaker. Measure reff voltages on comparators inputs.
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Hy Apex! I think the problem is solved. I was too tired, when i measured the circuit, and i used an old 24V fan, and for some reason, it didn't change its speed when the circuit gave 24V. Anyway, today i completed another protection circuit, and it works very well(i think). Here are my measures:

625mV on BD241C at 25 degC, fan gets 12V
When it drops to 440mV, fan gets 21V (i don't know, why not 24?) at this point i could barely touch the BD241C
At 340mV the protect led comes on, and the relay turns off.
As the component cools down, the relay turns back on.

Thanks for the help.

I post as soon as i can put pictures here, and now i start to make the B500 boards.

Bye
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Old 12th September 2010, 07:38 PM   #633
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Quote:
Originally Posted by yohnsee View Post
Hy Apex! I think the problem is solved. I was too tired, when i measured the circuit, and i used an old 24V fan, and for some reason, it didn't change its speed when the circuit gave 24V. Anyway, today i completed another protection circuit, and it works very well(i think). Here are my measures:

625mV on BD241C at 25 degC, fan gets 12V
When it drops to 440mV, fan gets 21V (i don't know, why not 24?) at this point i could barely touch the BD241C
At 340mV the protect led comes on, and the relay turns off.
As the component cools down, the relay turns back on.

Thanks for the help.

I post as soon as i can put pictures here, and now i start to make the B500 boards.

Bye
Good luck with B500,
Regards
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Old 20th September 2010, 06:04 PM   #634
yohnsee is offline yohnsee  Hungary
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Default Getting closer to finish

Hy! I post some pics, comment it if you want.
Apex: I modified the protect board, i hope you don't mind. I used my favorite relay, and so the board needed to be modified.
I also made a psu, 80.000uf/100V total, i hope this is enough for 2 of this B500 amplifiers.

P1000790.JPG

P1000791.JPG

P1000792.JPG

P1000793.JPG

P1000794.JPG

P1000795.JPG

P1000796.JPG

P1000797.JPG
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Old 20th September 2010, 07:14 PM   #635
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[QUOTE=yohnsee;2309159]Hy! I post some pics, comment it if you want.
Apex: I modified the protect board, i hope you don't mind. I used my favorite relay, and so the board needed to be modified.
I also made a psu, 80.000uf/100V total, i hope this is enough for 2 of this B500 amplifiers.

I like your work, I share all this schematics to be use, and to be upgrade, improve, modified...
Regards
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Old 21st September 2010, 04:07 PM   #636
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Default my project b500

this is some of pics of my project......
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File Type: jpg Photo0278.jpg (892.9 KB, 1712 views)
File Type: jpg Photo0279.jpg (878.5 KB, 1344 views)
File Type: jpg Photo0290.jpg (881.4 KB, 1143 views)
File Type: jpg Photo0281.jpg (936.6 KB, 1006 views)
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Old 21st September 2010, 04:13 PM   #637
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hi apex

sir in my project i have little problem.....in low volume audio is not clear,and when i start the amp it sound like ttrrrrrrr....
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Old 21st September 2010, 08:37 PM   #638
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Originally Posted by A square View Post
hi apex

sir in my project i have little problem.....in low volume audio is not clear,and when i start the amp it sound like ttrrrrrrr....
Do you use suggested ground wireing, and do you measurment voltage at suggested point?
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Old 22nd September 2010, 01:05 AM   #639
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Heii..Apex..I found problem on B500. Like this:
I used PSU +/-44VDC, If I not applied fuse, I measure voltase (+) and (-) to ground is simetris (44 vdc), also (+) and (-) to output power is simetris (44 vdc). But when I used fuse 10A, voltase (+) and (-) to ground not simetris, (+) to ground = 43vdc and (-) to ground only 35 vdc. Also (+) to out PA only 35vdc and (-) to out PA= 43 vdc.
If I used fuse 0,2A, voltase (+) to ground = 43vdc and (-) to ground = 42,3vdc. Also (+) to out PA=42,3vdc and (-) to out PA = 43vdc..
Please help me..
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Old 22nd September 2010, 06:33 AM   #640
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Default hi

hello sir
pls tell me how to wring of grounding and give me tips for wring......

thnx
have a gud day sir.......
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