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Old 19th February 2013, 02:47 AM   #2461
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Who want like this heatsing power BUILT UP with long 40cm and height 12cm...
Just $ 16.5./piece
Position in INDONESIA...
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Old 19th February 2013, 11:40 AM   #2462
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What is the safe voltage for B500 with 3 pairs of transistors?
It will be used only for 8ohms load.
I need about 250-300W.
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Old 20th February 2013, 09:53 AM   #2463
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Did you mean: adakah layout versi b500 TEF




is there a version of the B500 TEF lay out
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Old 21st February 2013, 11:00 AM   #2464
PetruV is offline PetruV  Romania
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After all im going to build this amp,this is a little more complex but i think its ok,\
I need pcb pdf so when i print it its the correct size
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Old 21st February 2013, 02:12 PM   #2465
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This CCS circuit add to B500 instead resistors feed zeners with 30mA with any rail voltage.
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Old 21st February 2013, 02:36 PM   #2466
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by apexaudio View Post
This CCS circuit add to B500 instead resistors feed zeners with 30mA with any rail voltage.
So the power to 5532 is more stable and it will sound better,also we will be able to get more power by increasing the voltage past the 90v mark and adding more outputs
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Old 21st February 2013, 03:01 PM   #2467
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Quote:
Originally Posted by PetruV View Post
So the power to 5532 is more stable and it will sound better,also we will be able to get more power by increasing the voltage past the 90v mark and adding more outputs
Power to NE5532 (+/-15V) will be stable from +/-30V to +/-90V rail voltage without any changes.
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Old 21st February 2013, 03:10 PM   #2468
PetruV is offline PetruV  Romania
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Aniways i need a .pdf pcb and layout
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Old 21st February 2013, 07:40 PM   #2469
PetruV is offline PetruV  Romania
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And what voltage and current transformer will i need for 1 chanell(im going to use one trafo per chanell)
Im going to rewind microwave transformers since theire cheap
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Old 22nd February 2013, 06:08 AM   #2470
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hi Apex, I have made TEF B500 and have been successful, but there are a few questions:
1. predriver transistor (MJE 350/340) and driver (5200/1943) is rather hot, is this normal?
2. how much minimum voltage for B500 TEF?
Thank you,
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