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Old 15th March 2011, 12:51 AM   #71
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Ampman,
I have a 5000w amplifier - Phonic XP5100 - but it blows out one of the channels because I connect its bridged output to an inductive load, a transformer with 4 ohm primary and 4000 ohm secondary for modulate an AM transmitter.
Could you advice me a protection system against EMI-RFI and any other trancient that could be appear in the AF amp outputs?????
Thanks
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Old 15th March 2011, 10:22 AM   #72
djk is offline djk
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Looks like the Altec 9440 output stage (post #5).

Click the image to open in full size.

The MJ21196 has 50% more SOA than the ML15024.
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Last edited by djk; 15th March 2011 at 10:40 AM.
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Old 15th March 2011, 12:10 PM   #73
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what i have never managed to figure out is..
what on earth you use something like this for?
say..
Arc welding or what?
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Old 16th March 2011, 10:56 AM   #74
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I built a lot of mono amplifiers running on 95V for subwoofer use.
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Old 16th March 2011, 10:17 PM   #75
jaycee is offline jaycee  United Kingdom
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It really does boggle my mind the people here who want to DIY an amp with such crazy amounts of power - especially class AB. I cant help feel a lot of it is trying to "do it on the cheap", hence the crazy suggestions of powering straight from line voltage.

Class G is a must here, but even then by modern standards that is crazy. I doubt you could safely and reliably build such a high power amp, for less money than you could get a purpose build Class D based PA amp to do the job.

djk, a sub amp on 95v supplies is about the limit of what i'd say is reasonable to DIY.
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Old 15th July 2012, 04:03 AM   #76
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Default HELLO

Hi Workhorse
Greetings. can you please tell no of transistor circled in red

warm regards
andrew
Attached Images
File Type: jpg npnamp.jpg (104.9 KB, 531 views)
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Old 15th July 2012, 05:54 AM   #77
djk is offline djk
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"djk, a sub amp on 95v supplies is about the limit of what i'd say is reasonable to DIY. "

Pretty much, unless you go class G or H.

"tell no of transistor circled in red"

I would use three MJE15033/34 for drivers (as per the Altec diagram) and use at least 8 pair of MJ15024 for outputs on the 94V listed, or use one pair of the MJ15024/25 for the drivers.
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Old 31st July 2012, 12:47 AM   #78
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Default Distorted sound at low volumes...

Quote:
Originally Posted by Workhorse View Post

Here is a Schematic for u
Amp was made by myself, with 1k at the input sound distorted and unclear at low volumes, here are the psu specs:125VAC Pri, 66-0-66VAC Sec, 1.5kva toroidal transformer from Plitron, 6-10,000mfd 125vdc Cornell Dubilier, i'm getting +-106vdc with no load, no input signal, Output BJT's are MJ21194, 12 per rail, drivers are MJE15034-35 HV rated as you know, and the rest of BJT' are MJE340-350, half of the outputs have been placed on a BIG heatsink, same for the other half(12 in one heatsink and the other 12 on other exactly same sized both of them) so heat is no a big deal here, a stated before, at low volumes sounds unclear and distorted, but when pushed sounds very well indeed, has large amounts of power, but i'm a little concerned about such distorted sound when it's running low,
what should i check? Thanks in advance, Paul...
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Old 31st July 2012, 12:51 AM   #79
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Quote:
Originally Posted by andrewlebon View Post
Hi Workhorse
Greetings. can you please tell no of transistor circled in red

warm regards
andrew
Nop, they actually are MJE15033 (PNP), Both of them.
Cheers.
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Old 31st July 2012, 01:06 AM   #80
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Hi Kimberlator
greetings pure coincindence only yesterday i designed pcb for this project
are you following schematic from post 36 thanks for replying
warm regards
andrew lebon
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