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Old 8th December 2011, 07:45 AM   #11
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Quote:
Originally Posted by moschfet View Post
If you don't see it, but Q14,20,21,22,23 are wrong wired.
The emitter must wired at positive voltage.
think it over .... i think you are wrong
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Old 8th December 2011, 07:47 AM   #12
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try to work with a schematic that features some protection ...either LDR or Vi limiter ....this amount of power without any limits might become catastrophic for the amplifier

taj idea will work much better than yours

kind regards sakis
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Old 8th December 2011, 10:08 AM   #13
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are you saying that the pnp and npn is placed wrong and the npn shall be n the top with positive voltage and pnp in negative voltage ? i will try working on some protection, i am mounting an lm35 on the heatskrink that gives signal to an arduinoboard and if the temp goes to high it will clip the relay on the transformer and the speakerrelay also . i am thinking about using the arduino board and a current limiter : http://www.sparkfun.com/datasheets/S...oard%20v12.pdf
i then add a display to show the temp and the current. will that work or is it better with LDR or Vi limiter?
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Old 8th December 2011, 10:33 AM   #14
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will this work ?
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File Type: pdf Forstærker rev 2.ms11.pdf (20.6 KB, 137 views)
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Old 8th December 2011, 11:06 AM   #15
AndrewT is offline AndrewT  Scotland
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No.
You still have devices upside down.
You still have parallel devices with zero emitter resistors.
You still have mixed AC and DC coupling.
You still have unusual input filter values.
Weird decoupling philosophy.
mje340 as a VAS device??????
R16 & R18 killing the performance of the VAS stage.
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Old 8th December 2011, 11:18 AM   #16
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i am simulating in multisim, can some of you open it and try making what you are writting, i am not understanding all you say ?
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Old 8th December 2011, 01:27 PM   #17
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I doubt that the new circuit can be simulated correctly. It seems as if you have no basis. Extensive knowledge in electrical engineering can not convey in a forum.
Why not first you build a working circuit?

Copier is no disgrace.
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Old 8th December 2011, 02:07 PM   #18
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Quote:
Originally Posted by anders3408 View Post
have an 1.3kW trafo that gives +- 58volt

will the amp i had designed be stable at 2 ohm or as low as 1 ohm ?

planning to build 2 of the amps and thinking on bridging the 2 pcb and drives it in 2 ohm bridge ?
not impossible, but even the most experienced builders would have a hard time to make this happen

you will have to lower your expectations, a lot

apart from it would cost a fortune in burned parts, it could actually burst into flames, literally
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Old 8th December 2011, 02:40 PM   #19
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Bridging is likely to exceed the SOA of the devices very quickly...

Otoh, a beefed up driver and a ton of output devices is an option...

But first build a small version like the driver and a simple output with just two devices to check that it is stable and works... not into a low Z load. To me the output stage is just odd... but I am not that good at this stuff.

Listen to Andrew about the FB.

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Old 8th December 2011, 03:11 PM   #20
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You have complimentry output devices. Then Q13 is used as a level shifter as would
be used in a quasi complimentry output stage.
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