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Old 14th July 2011, 04:25 AM   #41
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Thank you, Bonsai. I know it is a simple amp , but this is what is needed.
I'm down to just the input cap now ... ahhhhh
As it is , the options include:
- 2 compensation schemes -TMC and standard miller.

- 3 possible input stages- a. Just a simple 2 device input pair , b. a cascoded low noise BJT input pair, or .. c. a cascoded low noise Jfet input pair.

- 3 adjustments - some might say this is excessive.
a. is the main bias control - you ABSOLUTELY need this one to bias the amplifier. b. offset adjust - makes for that final touch of <2mv DC at output.
c. the CCS adjust.- different input pair devices are best optimized at different currents. .7 - 2.5ma (per device) is the range of this control.

- All double- sided traces can be directly jumpered for single- sided construction , this artwork can be used by both the board store and the laser printer madmen.

- Smaller on-board decoupling (1-2.2kuf) with a large external supply , or max onboard of 22Kuf X2. - 470uf VAS/IPS secondary decoupling.

Some said that I should do a triple .... I am for myself , using the same "style" for this board as for my own (output stage nearly the same). Nothing wrong with high beta EF2 , and I would and do own several of this design.

Around 94 components total full cascode , minimum 80 with no tmc/cascode/leds - etc.... 2 years ago I would not of been scared

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Last edited by ostripper; 14th July 2011 at 04:45 AM.
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Old 14th July 2011, 04:44 AM   #42
AKSA is offline AKSA  Australia
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Great project, Pete!

A credit to you that you were chosen for this design.....

Good to see you using a nice EF2, proven front end.

DIYaudio rules!

Hugh
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Old 14th July 2011, 05:05 AM   #43
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Thank you , hugh. At least someone appreciates an EF2.

I do think this one might exceed the silicon chip LIN amp. Layout is the only factor that can differentiate one ppm amp over another. NFB is dropped to 1/40th of output before it gets anywhere near the LTP/cascodes. some "snake" the full output back to the input stage resistor. I just don't like a 100v p-p right next to millivolts .

I hope you don't mind , but your amp designs (naska) influenced my choice of massive on-board decoupling. I just ported everything to mouser/apex jr./digikey so it could be a "world amp".

The sound might be considered "clinical" by some , but with the FET input option , the right combo of cascode/fet could make for some good sound.
Durability and MTBF , as planned .. nothing beats this amp.. 15- 20 years heavy use , no problem (regrease the OP/recap every decade). OEM's would fire me .
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Old 14th July 2011, 06:39 AM   #44
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Hi ostripper can you tell me for sprint layout 5.0 ? I want property of software 370mm but this software is show 300mm property and i sea demo version show 500mm pls help me .
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Old 14th July 2011, 02:09 PM   #45
Bonsai is offline Bonsai  Taiwan
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I think for this project, an EF2 is the way to go. You do need access to a scope in my view if you want to fully debug and test an EF3 output stage amp and this not something everyone has that will want to build this amp. Front end options on this design mean you can have your cake and eat it too in my view - even the JFET crew will be happy (well, half happy because it's not a fully balanced. ;-)
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Old 14th July 2011, 02:13 PM   #46
Bonsai is offline Bonsai  Taiwan
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BTW, I like the output inductor. Makes the amp bullet proof in my view. What's the value of L? 1 to 2uH should do it
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Old 14th July 2011, 04:30 PM   #47
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This is looking great! I want it!
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Old 14th July 2011, 05:28 PM   #48
ihan is offline ihan  England
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Hi,

In my experience the Vcc and Vee entry points to the pcb should be kept as close as possible so that the supply wires can be twisted together. This will reduce EM radiation which is likely to swamp the distortion of the circuit.

Trust me, the routing of the power supply leads is absolutely critical. It is something that has to be seen to be believed. I only discovered it when I bought an AP520 and built a blameless amplifier (with my own pcb layout). The loop area between Vcc and Vee has to be kept as small as possible. Bob Cordell in his book, even advocated interspersing the output devices - N,P,N,P etc, in order to keep the area between the + and - supply tracks as small as possible.

I'm sorry if you already knew this, but as you are putting in so much effort, I thought I would mention it. Layout of psu wiring is and positioning of the power entry points on the pcb (and the associated tracking) is critical - as is the -ve feedback take off point (Self's book at least makes this point clear).

I hope this is of of some use,
Cheers, Ian
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Old 14th July 2011, 06:22 PM   #49
Bigun is offline Bigun  Canada
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ihan, this is also my philosophy and my TGM amplifier pcb layout is different from most in being non-symmetrical - the power lines run everywhere together on the pcb so no loops.
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Old 15th July 2011, 12:32 AM   #50
Bonsai is offline Bonsai  Taiwan
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Be careful on this point. The currents flowing in the supply lines of a class AB amp alternate between the rails depending on the output signal, so they cannot actually cancel. It's probably more important to think about how to keep the half wave supply rail radiation (which is full of harmonics) away from the small signal circuitry, where it's likely to be picked up.
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