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
u cant run b500 in bridge mode @ 4E . if need 2 drive b500 at bridgemode lower the voltage rail and run @ 8E....
regards
sekhar
apex said +/-90v dc😀B500 based on schematics of H900, but in AB class.
Power supply +/-90Vmax.
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,
i see many builder using 4 pairs of caps or more,
how is that? the more the merrier,
sorry i dont understand.why use bulb?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.
amplifier just use example -+70v.how the connection of bulb with this amp?
Attachments
@ 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
You need add predrivers (post #967) and use 7 pairs of outputs for 4 ohms load in bridge mode.
Regards[/QU
thanks alot sir.
it prevents you blowing up your amplifier if you have made a mistake wiring it up.sorry i dont understand.why use bulb?
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.1,2 - two pairs 2SA/2SC with +/-56V you will get about 120W/8R (resonable THD)
Regards
this for h900 or b500?im not understand about using tl072 step driversorry for my lines
hope this make sense
apex pls. correct me if i'm wrong
b500 is b500
if u need a h class amp then u need tl072 step drive ,
tlo072 make b500 AB class to h class.
h900 is h class very good powerful amp bt 1st make b500 for experience.
if u need a h class amp then u need tl072 step drive ,
tlo072 make b500 AB class to h class.
h900 is h class very good powerful amp bt 1st make b500 for experience.
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.
Step driver is separate circuit and can be use with any classAB amp to get classH amp.
B500 and H900 don't need step driver, B500 is classAB amp and H900 is classH amp with integrited step driver.
Regards
does any body where in the post apex PSU-7 WITH SOFTSTART AND PROTECT OUT pls.
PSU-7 is for MOSFET amplifier with 4xIRFP240/9240 in thread http://www.diyaudio.com/forums/solid-state/162043-mosfet-amplifier-irfp240-irfp9240-34.html post #333.
Regards
B500 - one channel
Hy everyone! I finally finished the metalwork with the B500 heatsinks, and could start one of the amps. As soon as I have time, I'll post pictures of it, but at the moment all I can say is: WOW! This sounds great. As far as I can only try it on my 50w kenwood hifi speakers, it is very powerful and has excellent sound (for my ears). So thank you Apex for sharing this with us, and as soon as I can I will post pictures.
Bye
Hy everyone! I finally finished the metalwork with the B500 heatsinks, and could start one of the amps. As soon as I have time, I'll post pictures of it, but at the moment all I can say is: WOW! This sounds great. As far as I can only try it on my 50w kenwood hifi speakers, it is very powerful and has excellent sound (for my ears). So thank you Apex for sharing this with us, and as soon as I can I will post pictures.
Bye
Hi all,
this is a new SMD based design. hope you all will like it.
Thanks for share, I like modern version, do you planing to buid it?
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