Official M2 schematic

[stefanobilliani]

yes , it is

that will decrease Iq , of course , and increase output impedance , and decrease A class power

OKay .

One more thing , regarding the N channel Mosfets ; I did build the amps ,working perfectly with the Fairchild IRFP9240 ( as with the F5 ), but I have also a couple of IR ...Just wondering if on the M2 the IR's can make slight difference or not .

Thanks

 

[ElFishi]

Trannies

Aaron from Don-audio says the trannies have arrived and are shipping now.
Yay!

 

[DIYspaceW]

Aaron from Don-audio says the trannies have arrived and are shipping now.
Yay!

Yap!

 

[DIYspaceW]

By the way mine jfets have IDSS around 6.6mA. Do I need to decrease the source resistance?

 

[WalterW]

ah, shön.
I received an email to evaluate the Edcor's I bought, now I understand

 

[WalterW]

By the way mine jfets have IDSS around 6.6mA. Do I need to decrease the source resistance?

No 6.6 mA is fine, it's just a buffer

 

[ElFishi]

I have 10 cans 22mF each coming for the PSU.
How shall I combine them for the filters of the two rails?
rectifier-CCRCCC-amp
rectifier-CCCRCC-amp
or even
rectifier-CRCCCC-amp
rectifier-CCCCRC-amp?

 

[DIYspaceW]

I have 10 cans 22mF each coming for the PSU.
How shall I combine them for the filters of the two rails?
rectifier-CCRCCC-amp
rectifier-CCCRCC-amp
or even
rectifier-CRCCCC-amp
rectifier-CCCCRC-amp?

Try to simulate whit psu tool! I would use 5x22mF-R-5x22mF.
But if you have only 5 per rail then 2x22mF-R-3x22mF!

I also have 22mF in my psu. I choose 1x22mF - L - 3x22mF!

 

[ElFishi]

When I tried LTSpice and simply configured a CRC filter adding capacitance after the resistor had more impact on attenuation at 50Hz than in front.

PSU Designer II from Duncan's Amp Pages actually gives a different picture (Vpp)
2C-R-3C 50mV
3C-R-2C 40mV
1C-R-4C 90mV
4C-R-1C 46mV

 

[2 picoDumbs]

Try it again with correct Cap ESR.
I like ltspice cause I can do dynamic loading not just static loading, or any other scenario that I can think of.

 

[ElFishi]

Just downloaded LTSpice and need to learn e.g. how to do "dynamic loading" (can you expand, pls?)

Caps are Panasonic TS-UP ECOS1EP223CA and the ESR I find in the sheet is 0.029Ohm@120Hz. In the sim I put 30mOhm. Where is my mistake?

 

[2 picoDumbs]

Just downloaded LTSpice and need to learn e.g. how to do "dynamic loading" (can you expand, pls?)

Caps are Panasonic TS-UP ECOS1EP223CA and the ESR I find in the sheet is 0.029Ohm@120Hz. In the sim I put 30mOhm. Where is my mistake?

When you arrange caps in parallel, effective ESR drops.
Two caps in parallel: 1/R = 1/30 + 1/30
R = 15mOhms

3 caps in parallel will be 10mOhm etc

 

[2 picoDumbs]

If your speakers are considered a difficult load, then CCCCRC ie with single cap at output will potentially give much worse ripple as well as voltage drops on dynamic loading depending on speaker impedance and sensitivity.

 

[ElFishi]

Right!
See, this is why I come here.

Results are quite different:
2C-R-3C: 40,4 mV
3C-R-2C: 40,5 mV
1C-R-4C: 51,6 mV
4C-R-1C: 52,4 mV

Seems there's mileage in symmetry.

 

[Ripcord]

Altec 15095A

Hi. I have a couple of these lying around and was wondering if they could be used in the front end of the M2. I've attached a couple of pictures of the Altecs hoping for suggestions on proper hook-up. I've already put together a pcb in diptrace that I posted if anyone would like to look through it to see if it makes sense. Thanks.

 

[Zen Mod]

that's it

all you need is to do proper phasing

 

[drjbf1]

Wow, that's looks so cool.

 

[DIYspaceW]

The edcors arrived today...

 

[WalterW]

Same here....

 

[rolandong]

and the only thing missing is PCB?
I need to save some Euro bucks then...