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Old 7th March 2005, 01:26 PM   #1
zox2003 is offline zox2003  United States
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Default Schematic For P.a With Op Amp Input

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...
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Old 7th March 2005, 01:47 PM   #2
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Lynx amp.
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Old 7th March 2005, 01:56 PM   #3
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Maybe this
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Old 7th March 2005, 01:58 PM   #4
AndrewT is offline AndrewT  Scotland
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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.
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Old 7th March 2005, 01:59 PM   #5
edl is offline edl  Hungary
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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
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Old 7th March 2005, 02:06 PM   #6
edl is offline edl  Hungary
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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!
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Old 7th March 2005, 02:15 PM   #7
zox2003 is offline zox2003  United States
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Default Amplifier 150 w /4 ohm

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...
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Old 7th March 2005, 02:44 PM   #8
MikeB is offline MikeB  Germany
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What happened to your other amplifier ?
This one:
http://www.diyaudio.com/forums/showt...862#post582862

Mike
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Old 7th March 2005, 03:19 PM   #9
zox2003 is offline zox2003  United States
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Default Amp

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.
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Old 7th March 2005, 07:52 PM   #10
edl is offline edl  Hungary
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Default Re: Amplifier 150 w /4 ohm

Quote:
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.

Quote:
AMP WILL WORK ON 4 OHMS !
for 150W sinus on 4 ohm you will need +/-50V rails.
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