KentAudio "Construction ONE"

bogdan_borko · 14th June 2006, 09:47 PM

HEllo good people!

After 18 months, reading diyAudio threads, articles and

books of all well known audio gurus

(Pass,,Curl,Slone,Hiraga,Stochino,...) ,and examining all

kind of circuits and topologies, I finally designed my

own compatibile audio system.
The work wasn`t easy at all! My knowlege of solid state

amplifiers was pour(still learning), and I spent days and

nighhts simulating all kind of circuits and building two

ab-class standard amplifiers...

The "Construction ONE" system is actually my version of

class-a single-ended mosfet source-follower (used for

current amplification) and current-feedback high-speed

preamplifier (used for voltage amplification).

I would like to hear your comments about this circuits

I`ve designed before I start pcb construction.

The simulation results:

Current amplifier:
Q9, Q10: 4.89mA
driver stage: 58.8mA
power stage: each IRFP240: 2.8A
each IRFP250: 4.2A
THD: 0.00293%
Input:10.59Vrms
Output power 30W

Voltage amplifier:
Input stage: 2mA
VAS:5.4mA
Output stage:30mA
Input voltage for full output stage power:700.6Vrms
simulation result of slew rate: 214V/uS

Thanks, Bogdan.

bogdan_borko · 14th June 2006, 09:49 PM

preamplifier shematic:

bogdan_borko · 15th June 2006, 06:04 AM

hm...

bogdan_borko · 15th June 2006, 10:58 AM

Is it so uninteresting?

Leolabs · 15th June 2006, 03:08 PM

Hi,when you really build it,then it is very interesting.

bogdan_borko · 15th June 2006, 04:23 PM

you didn`t read the thread ,I think...
I was asking, what do you think about the circuits and should I change somthing to improve it...
Question for a power follower: would it be better to bias the driver stage (MJE 15030) with the simple ressistor and does ccs improves something in this case.

THanks.

lumanauw · 15th June 2006, 05:34 PM

The voltage gain stage is seems like modified CFP. With the same part count you can built diamond buffer. Which is better?

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15th June 2006, 06:04 AM	#3
bogdan_borko diyAudio Member Join Date: Nov 2005 Location: serbia, zajecar	hm...

15th June 2006, 10:58 AM	#4
bogdan_borko diyAudio Member Join Date: Nov 2005 Location: serbia, zajecar	Is it so uninteresting?

15th June 2006, 03:08 PM	#5
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Hi,when you really build it,then it is very interesting.

15th June 2006, 04:23 PM	#6
bogdan_borko diyAudio Member Join Date: Nov 2005 Location: serbia, zajecar	you didn`t read the thread ,I think... I was asking, what do you think about the circuits and should I change somthing to improve it... Question for a power follower: would it be better to bias the driver stage (MJE 15030) with the simple ressistor and does ccs improves something in this case. THanks.

15th June 2006, 05:34 PM	#7
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	The voltage gain stage is seems like modified CFP. With the same part count you can built diamond buffer. Which is better?