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Old 4th September 2012, 07:06 AM   #721
olafk is offline olafk  Germany
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Quote:
Originally Posted by joeyt View Post
what is the power output of this compact module using -40v 0v +40v?
Please read the posts from #708.

regards, Olaf
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Old 4th September 2012, 12:23 PM   #722
joeyt is offline joeyt  Philippines
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no answer from post no.708. i read in this forum that the power output of a PA comes from the supply voltage with adequate heat sink to its output transistor. -40v 0v +40v maybe i will get around 90 watts in 8 ohms. correct me pls.if i am wrong

thanks,joeyt
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Old 4th September 2012, 01:05 PM   #723
olafk is offline olafk  Germany
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Default Andrew T. wrote in Post 700...

"+-30Vdc will sag to maybe around +-27Vdc when driving full power to a test resistor.
The voltage lost through the amplifier could be very approximately 3Vdrop when delivery that full power to the test load.
That leaves your maximum output voltage @ ~24Vpk.

Pmax = Vpk^2 / Rload / 2.
I predict your maximum power for a +-30Vdc supply as ~ 36W into 8r0"

-------------------------
I can not measure the output power of this module. But I hope the calculation from Andrew can give you a example.

regards
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Old 4th September 2012, 03:31 PM   #724
AndrewT is offline AndrewT  Scotland
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Joey,
why do you expect others to do your homework?
Read Olaf and read his reference post.
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regards Andrew T.
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Old 2nd December 2012, 03:07 PM   #725
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hello sir can any share amplifier bridging circuit
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Old 15th December 2012, 06:43 PM   #726
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Quote:
Originally Posted by apexaudio View Post
I find paper with circuit of this amplifier with single pair 2N3773 and added VI limiter.


sir plz share pcb layout for this single pair amp
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Old 14th January 2013, 05:56 AM   #727
lelut is offline lelut  Indonesia
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Quote:
Originally Posted by olafk View Post
Hi,

I built the amplifier (picture see post #663) with two pairs of 2N3773 and I use +-60V DC. Now the Transistors MJE350/340 become to hot. I can touch them for only 3-4 seconds and I think it is a bit critical.
Should I reduce the voltage (have regulated power supply) or are there any other things I can do? I changed the heatsink to a bigger version for TO220 like the MJE15030, but gave no better result.
Can anybody help me?

regards
Olaf
Dear Sir Olaf,

How difference using +-60V or only using +-42V at sound (using 2N3773 final TR)?
more deep or more mid character?

And for your second kit, using 2n2922, how about sound character?

i will plan this schematic for outdoor PA using 8x2N3773 or 8x2N2922 per-channel.

thanks,

BR,
Made Sumber
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Old 14th January 2013, 03:02 PM   #728
olafk is offline olafk  Germany
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Hi lelut,

I have not compared the sound with different voltages. But I think, there's not much difference.
For my taste the 2N2922 sound a little better and more balanced in the bass - but that is very subjective.
I built the amps for my sons to make noise ;-).
For hifi I use ax14. Next project is ax20 with 3 pairs.
Sorry for the only few informations.

regards Olaf
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Old 14th January 2013, 03:15 PM   #729
Vostro is offline Vostro  South Africa
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Olafk if you build ax20, please comment on how it compares to ax14 in apex100w thread,
Im interested to know how they compare.
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Old 14th January 2013, 04:37 PM   #730
olafk is offline olafk  Germany
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I will do so.

Regards Olaf
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