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Old 3rd December 2010, 04:57 PM   #1001
sekhar is offline sekhar  India
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rhodrich
u cant run b500 in bridge mode @ 4E . if need 2 drive b500 at bridgemode lower the voltage rail and run @ 8E....

regards
sekhar
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Old 3rd December 2010, 11:39 PM   #1002
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Quote:
Originally Posted by apexaudio View Post
B500 based on schematics of H900, but in AB class.
Power supply +/-90Vmax.
apex said +/-90v dc
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Old 3rd December 2010, 11:42 PM   #1003
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and supply drops +/-10v underload
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Old 3rd December 2010, 11:46 PM   #1004
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how many reservoir caps can i use?
i see many builder using 4 pairs of caps or more,
how is that? the more the merrier,
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Old 4th December 2010, 12:32 PM   #1005
Mamak is offline Mamak  Malaysia
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Quote:
Originally Posted by wg_ski View Post
If you use a light bulb limiter, you don't need to step it down first or use any DC protect. The light bulb is actually better than a variac. A lot of amplifiers will work perfectly at lower voltage and get unstable at full voltage. With a variac turned down it may behave, and then go bang very suddenly as it is brought up. The light bulb will let the amp get to 90% of normal voltage when it's idling, and bring it down automatically if it goes unstable.
sorry i dont understand.why use bulb?
amplifier just use example -+70v.how the connection of bulb with this amp?
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Old 4th December 2010, 12:42 PM   #1006
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A series light bulb, like this:
Light Bulb Current Limiter

Regards,
Max.
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File Type: png Lightbulb_Limiter1.png (6.9 KB, 1752 views)
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Andres
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Old 5th December 2010, 10:54 PM   #1007
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Originally Posted by rhodrich View Post
@ apex

Sir if b500 will be bridged at 77+- vdc because. i have trafo 55 0 55 2000va and loaded with 4 ohms. i think i will end up burning my amp. i will have peak to peak voltage of 154 then try loses or voltage sag to 134vdc p-p. so the amp power would be 4489 watts at 4 ohms. if the power is continues the current 33.5A. if it is possible to do this way how many trannies needed? maybe need to used mjl4281 bec. have higher voltage rating than 2sc500.
pls. comment sir apex about this. thanks alot
You need add predrivers (post #967) and use 7 pairs of outputs for 4 ohms load in bridge mode.
Regards
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Old 5th December 2010, 11:59 PM   #1008
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[QUOTE=apexaudio;2388456]You need add predrivers (post #967) and use 7 pairs of outputs for 4 ohms load in bridge mode.
Regards[/QU

thanks alot sir.
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Old 6th December 2010, 12:11 PM   #1009
AndrewT is offline AndrewT  Scotland
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Originally Posted by Mamak View Post
sorry i dont understand.why use bulb?
it prevents you blowing up your amplifier if you have made a mistake wiring it up.
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Old 7th December 2010, 12:41 AM   #1010
Mamak is offline Mamak  Malaysia
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Quote:
Originally Posted by apexaudio View Post
1,2 - two pairs 2SA/2SC with +/-56V you will get about 120W/8R (resonable THD)
Regards
apex.b500 need step driver or not?or step driver only for h900?i still collect enough information to build this amp.i want to drive car subwoofer speaker.
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