Class A power follower

Drasius · 24th December 2004, 01:27 PM

This is only concept.
Any coments please...

sajti · 24th December 2004, 02:19 PM

Quote:

Originally posted by Drasius
This is only concept.
Any coments please...

It should work. But not necessary in class A. If You set small bias with the lower part, it can work in class AB as well.

sajti

Drasius · 24th December 2004, 03:27 PM

Right, but with class A (idle current 1.3A) much better results.
What spectrum of simulation?..

darkfenriz · 26th December 2004, 02:03 PM

I wouldn't use this in class AB with feedback
think about phase shift of a trafo- may cause hard to avoid oscilations

in class A it is nice.. something like susan-parker's

regards

sajti · 26th December 2004, 02:36 PM

Quote:

Originally posted by Drasius
Right, but with class A (idle current 1.3A) much better results.
What spectrum of simulation?..

With this bias it will be class A, up to 25W/8ohms.
The spectrum means low distortion, but the large 5th harmonic looks strange for me...
Feedback can helps to reduce the distortion, but with interstage transformer You can't use more the 14-16dB without instability

sajti

Mark A. Gulbrandsen · 26th December 2004, 04:50 PM

I have built a pair of power followers in the past that were designed by that guy in Italy.... can't rememhber his name. They sounded fine and were a good exercise in amp building but overall a waste of time. I would reccomend building one of the Aleph projects instead of wasting your time and money.

Mark

Drasius · 27th December 2004, 10:02 AM

Quote:

Originally posted by sajti

The spectrum means low distortion, but the large 5th harmonic looks strange for me...

0.0008% is strange?....

sajti · 27th December 2004, 10:08 AM

Quote:

Originally posted by Drasius

0.0008% is strange?....

Not too much

I just compared to the others....

sajti

DarkHorse · 20th January 2005, 07:26 AM

Hi,so new struction of the circuit!
but the driver(transformer) is hard to DIY or Buy somewhere...
if modify the circuit...same as JLH's output stage...
I think many problems will not surv.

Drasius · 20th January 2005, 08:31 AM

Thanks to negative feedback, transformer in this circut is no so critical.Did have configuration 1:1:1.
Buy somewhere...http://www.jensen-transformers.com/d...s/123blcf1.pdf
I will try to build amp with circut below

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26th December 2004, 02:03 PM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	I wouldn't use this in class AB with feedback think about phase shift of a trafo- may cause hard to avoid oscilations in class A it is nice.. something like susan-parker's regards

26th December 2004, 04:50 PM	#6
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	I have built a pair of power followers in the past that were designed by that guy in Italy.... can't rememhber his name. They sounded fine and were a good exercise in amp building but overall a waste of time. I would reccomend building one of the Aleph projects instead of wasting your time and money. Mark

20th January 2005, 07:26 AM	#9
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	Hi,so new struction of the circuit! but the driver(transformer) is hard to DIY or Buy somewhere... if modify the circuit...same as JLH's output stage... I think many problems will not surv.

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