500watts Amplifier help

[darkkiller]

I think its 500w but i'm not sure.I just want to ask questions in this forum cause your knowledge is much than me.Sorry for my bad english.I did this amplifier and worked but its clipping i think.I really dont know what youre tellin it. It gives dc to my subwoofer i think.Cause i dont think this amlifier can heat up a 1000w rms/3000w peak pioneer ts-w3004spl. Please help me i will use amplifier in low freq.For only subwoofer.Thanks a lot.I know its so simple but if you can help i can do better.Thanks for helping so much.

I did circuit in ares.I added ares layout and i will add jgp format.

[Nelson Pass]

This is the Pass Labs forum.

We are afraid of high power amplifiers.

I think you want the Solid State Forum.

[woody]

I can not open that file.

[darkkiller]

This is the jpg version.

[Cal Weldon]

Moved to solid state.

[Andy L. Francis]

500W from two pairs of MJ15003/15004?!
BD139/140 as VAS/CCS at +/-70V rails?!
BD243C/244C as drivers at +/-70V rails?
No OP-stage protection?!
Etc...
Etc...
It looks a bad design. Build a Leach-amp or something like that!

Anyway:

I did this amplifier and worked but its clipping i think

Clipping? Exactly how does it clipping?

It gives dc to my subwoofer i think.

Do not think, let's measure!

[gain]

where did you find this design? did you design/build it yourself? if you did, congratulations, you designed and/or built an amp that produced music, which you should be proud of yourself for.

im new to homebrewing amps myself, so i hope this isn't a case of the blind leading the blind, but basically the best piece of advice i can give you is listen to the guys on this forum ... they really know their stuff imo.

everything Andy said is money. you shouldn't even be thinking about pushing anywhere near 500W out of this amplifier. reduce the rail voltages, at least for now, to +/- 40V for ~100W into 8 ohm or maybe +/- 50V for ~150W into 8 ohm. this will ensure the outputs stay well within their SOA's and reduce the voltage requirement on the VA and predriver transistors, which as Andy pointed out are grossly underrated for +/- 70V.

[sakis]

factory made sansui B1000 uses only 2 transistors per channel drives the with stk3082II and use rail voltage of almost 65+65 volts....producinng almost 120w per ch

of course this happens together with a very triger happy protection..... it is enough to furt next to the amp and protection will be activated

[sakis]

[B]where did you find this design? did you design/build it yourself? if you did, congratulations, you designed and/or built an amp that produced music, which you should be proud of yourself for.[QUOTE]Originally posted by gain


well since diy audio is not that really old in turkey probably some nice designer like kapibara member of this forum copy and upgrade some design like he did with the john fisher ( simple 150w amplifier) (!!!!! he he he ) and post it in diyaudio turkey ....

and as usual since so many posts where done for the john fisher amp ...... there are more to follow with designs like that ..... based on theft .....

very well

[darkkiller]

Originally posted by Andy L. Francis
500W from two pairs of MJ15003/15004?!
BD139/140 as VAS/CCS at +/-70V rails?!
BD243C/244C as drivers at +/-70V rails?
No OP-stage protection?!
Etc...
Etc...
It looks a bad design. Build a Leach-amp or something like that!

Anyway:

Clipping? Exactly how does it clipping?


Do not think, let's measure!

I changed bd243c-244c with bd139-140.I mean i used 243c and 244c not bd139-140. Can i fix this amp' problem? Why it heats up cables(from amplifier to subwoofer)? And they are not small cables.Can anyone help me to do 500-750w amplifier @2ohms.Im using subwoofer 4+4 ohms parallel.It's 2 ohm now and i want to use it in home for 2weeks.Thanks again.And i know its not proffessional design.