Schematic For P.a With Op Amp Input

[zox2003]

HI,

I need schematic for Power Amplifier with Op Amp on input( TL 071, NE5534...) and power around 150W.
Not too complicated but reliable---PLEASE.
For output I would use MJ15003/15004.

Thanks...

[richie00boy]

Lynx amp.

[peranders]

Maybe this

[AndrewT]

Hi,
for 150w into 8 ohms you will need Vrail about 60v to 63v.
This will require an output pair that can take 126v while drawing worst currents.
MJ15003/4 prefer a slightly lower voltage. They will cope easily with a Vrail of 50v and optimised for highest power will just about manage 120w into 8r.
If you really must have >60v rails the I recommend a higher voltage output pair.

[edl]

edl.atw.hu/pa300.djvu

you need a "djvu" reader to see it.

the schema as a picture:
http://www.audiofanatic.it/Schemi/Ti...5003_15004.jpg

[edl]

the mj15003/04's Uce is 140V. so the max rail voltage is +/-70V.
with +/-70V rail an amp produces 190W-sinus to 8ohm.

looking to the soa of the transis:
at 70V Uce it can handle 2.3A
at 190W on 8ohm the current is 2.44A.
so you need to use 2 pairs. (because of the much heat, too!)

for 150W-8ohm +/-63V rail is enough. if your heatsink is really-really big, you can use one pair. but don't do it!

[zox2003]

AMP WILL WORK ON 4 OHMS !

Thanks.

Please something simple.
I had schematic of PA with TL071, TIP31/32 drivers, 2N3773 x 2 but I lost it.

Thanks...

[MikeB]

What happened to your other amplifier ?
This one:
http://www.diyaudio.com/forums/showt...862#post582862

Mike

[zox2003]

That amplifier is DONE.
It is in a box already.Friend of mine was just asking me about some good,reliable and simple amplifier design using OP AMP on input stage ( he loves OP AMPS).He wants me to build it for him.

I will post pictures of that first amp soon.
Thanks for your interest an first amp.

[edl]

Originally posted by zox2003
AMP WILL WORK ON 4 OHMS !

Thanks.

Please something simple.
I had schematic of PA with TL071, TIP31/32 drivers, 2N3773 x 2 but I lost it.

Thanks...

hi

maybe that amp was something like this:
edl.atw.hu/ta_3600c.jpg
this amp was sold as a kitset from China, as I heard.
It's not a simple amp, anyway.

AMP WILL WORK ON 4 OHMS !

for 150W sinus on 4 ohm you will need +/-50V rails.