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Old 22nd January 2011, 05:00 PM   #1291
nikko is offline nikko  Bosnia and Herzegovina
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Again, thank you, me personally not interested in power.
Amplifier is a reliable, worked with the test transformer(2x45V 500W) almost all day in full force.
Of course the artificial resistance, several resistors in series.
Since I have Fullrange speakers(sonido) a few watts is al ot for a listening.
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Old 23rd January 2011, 12:57 AM   #1292
Krisfr is offline Krisfr  United States
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Hey Pete

What is maximum rail voltage for the 250 and watt would the wattage be into 8? Recommended VA rating...?

Any thoughts of a Protection circuit?

Anyone have a GOOD suggestion as to a NICE case to put Rudi's amp in as is with 8 output devices... NOT overly expensive...
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Old 23rd January 2011, 07:14 AM   #1293
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You could go 75+ V or even 80 V as the cap multiplier drops about 2 v to the voltage board. You might want to limit input amplitude like I do as this amp can create QUITE the transient.

(below) I have finalized the PB250 / AX / EX (simple supersym) , only one board left to do (artu's full comp. amp - CLX).

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File Type: jpg ax-ex-pb250hd.jpg (679.4 KB, 458 views)
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Old 23rd January 2011, 10:11 AM   #1294
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Krisfr View Post
What is maximum rail voltage for the 250 and watt would the wattage be into 8? Recommended VA rating...?
250W mono or 250W+250W stereo?
a transformer of 200VA will successfully power an amplifier with between 100W and 200W of maximum output.

If you have 250W+250W of maximum output, you will find that 500VA to 1000VA will give a successful build. 45Vac or 50Vac secondaries will give power either side of the 250W target. Don't use 4ohm speakers with these higher voltage transformers.
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Old 23rd January 2011, 06:44 PM   #1295
codegen is offline codegen  Norway
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Will there be a update to the AX PCB Layout soon? (regarding the 1.9v clipping...)

Im currently waiting for more Presensitized PC Boards from my supplier before im starting on making those AX boards. Just received 2SC2240 and 2SA970 transistors a couple days ago. Only missing those boards, and 1k trimmers(only have 2k and 200r) and C92 on PB250 board and then im ready.
Done with the PB250 boards by the way, their only missing the AX board and C92 and they are ready to go!
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Old 23rd January 2011, 07:36 PM   #1296
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Default AX 1.3VBC

I still need the parts , but it should work. the only differences are the way the CCS's get their reference ground , the lack of a cascode , and the Cordell safety device (Q9). (Below) is the artwork (zipfile) and a pix of the results. I have tested these changes on the real one by "point to point" (cob jobs ).
Also , CMC , TMC , and TPC compensation is available , read the new Cordell book or the negative feedback thread. This amp is close to his example , but tested in the real world. I will just add this as a variant to the AX package as it uses ECB standard 120 Vce input stage devices (keep it simple).

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File Type: gif AX1.3vbc.GIF (9.2 KB, 760 views)
File Type: jpg axnew.jpg (186.8 KB, 737 views)
Attached Files
File Type: zip Ax1.3vbc.zip (326.6 KB, 139 views)
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Last edited by ostripper; 23rd January 2011 at 07:46 PM.
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Old 23rd January 2011, 07:47 PM   #1297
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Can you provide an updated version of the schematics as well?
Many thanks and best regards - Rudi_Ratlos
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Old 23rd January 2011, 08:28 PM   #1298
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Default PSRR - the next level !!

THD is important , but PSRR is just as much a distortion mechanism. It also has a second effect to give better separation .. hence , a better sound stage. Since I have been using cap multipliers , this has been quite apparent in my listening experiences. (Below 1) is the best performance/simplicity ratio (circuit wise) I have been able to produce. Some would "go the mile" and use a fully regulated supply , but by looking at attachments (Below 2 - OPS /3 - input stage) , you can see we have stellar PSRR. Even at the output , this is more than adequate. I have only added a darlington to the multiplier (MJE340/350 - ksc1845/ksa992) , this improves the multiplier by 100X , the only downfall is a greater BE drop (2V+). OH WELL !! The price you pay for performance.

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File Type: gif axnewCM.gif (33.4 KB, 743 views)
File Type: gif PSRR.gif (19.5 KB, 723 views)
File Type: gif PSRR2.gif (20.5 KB, 570 views)
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Old 23rd January 2011, 09:31 PM   #1299
codegen is offline codegen  Norway
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Nice OS, thanks!

One question, the diodes Murs120, 5A on the output boards, im using MUR820 there, this should be ok, right? Their the only ones i have on hand with such speed and current handling.
Oh, and at the AX board, 1n4148 should work instead of the specified 1N914?
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Old 23rd January 2011, 10:00 PM   #1300
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Quote:
Originally Posted by codegen View Post
Nice OS, thanks!

One question, the diodes Murs120, 5A on the output boards, im using MUR820 there, this should be ok, right? Their the only ones i have on hand with such speed and current handling.
Oh, and at the AX board, 1n4148 should work instead of the specified 1N914?
??? Murs120 = DIODE ULTRA FAST 1A 200V SMB - MURS120T3 = 1A diode.
I use either this or 1n4900 series ... "superectifier" http://www.vishay.com/docs/88509/1n4933gp.pdf

For the "big ones" ... 3A for the pb120/250 will do the job (flyback immunity) 5A is optional. I use these now ... http://www.vishay.com/docs/88744/srp300a.pdf Faster switching is somewhat important seeing what these "flybacks" do.


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