Mirand A1 CFA-Amp (Pictures) welcome comments !

[sonnya]

Sorry i have not replyed.

I have been far to busy the last few month.

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R70 and R71 is used to lower the openloop gain.
I would recommend you not to use them. They will give rise to the distortion. If they are going to be used they should be >100K each.

R16 should be 220R - 470R. I use 470R. To low it will lower the openloop gain, too high i will make the phase margin to small.

D9 and D10 should be BAV103.

Q34 and Q35 should be BC846B/856B.

R45,R46,R49,R50 should be 4k7. They will give you a soft current limiter because of the circuits nature.



The last sets of data and schematics i have made:

http://mirand.dk/miranda1V11-doc.pdf

 

[sonnya]

Here is some updated building instructions.

http://mirand.dk/miranda1v11.zip

 

[peranders]

R70 and R71 is used to lower the openloop gain.
I would recommend you not to use them. They will give rise to the distortion. If they are going to be used they should be >100K each.

Aren't those pretty unimportant because it's a current feedback amp?

 

[sonnya]

For us? yes they are, but some in the danish forum's have asked for them. So here they are.

I have not used them until now, and i will still not use them.

But some person's which think they can hear how dry the air is will use them.