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Old 15th November 2013, 09:48 AM   #2851
Maroof is offline Maroof  Pakistan
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Hi apex,
I have made nx14 using IRFP460 . sound is very good and clean. Thanks for providing such nice a circuit . Do u have any circuit which only uses N channel FET and can provide 300w to 500w at 4ohm load?
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Old 15th November 2013, 10:14 AM   #2852
AndrewT is offline AndrewT  Scotland
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Quasi did a few projects that meet that spec.
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regards Andrew T.
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Old 15th November 2013, 12:49 PM   #2853
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Originally Posted by Maroof View Post
Hi apex,
I have made nx14 using IRFP460 . sound is very good and clean. Thanks for providing such nice a circuit . Do u have any circuit which only uses N channel FET and can provide 300w to 500w at 4ohm load?
Nice, can you post pictures?
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Old 15th November 2013, 03:07 PM   #2854
Maroof is offline Maroof  Pakistan
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Originally Posted by apexaudio View Post
Nice, can you post pictures?
Sorry it was only a test setup with unregulated power supply so I disassemble the circuit . But i will definitely post pictures when i complete my amplifier.
Apex, can i parallel 5 pairs of FETs to get 500w on 4ohm load using NX14 circuit ? then what should be DC supply voltage ?

Last edited by Maroof; 15th November 2013 at 03:09 PM.
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Old 16th November 2013, 10:51 AM   #2855
Vostro is online now Vostro  South Africa
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This simple shunt regulator can be use with AX amplifiers for preamp supply. Amp rail voltage can be use for regulator input (without 1N4007 diodes and 4700uF caps).
Mr Mile
Is it best to use 2x24Vac transformer or is a 2x18Vac transformer OK regarding this preamp regulator circuit

Thanks
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Old 16th November 2013, 11:46 AM   #2856
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Mr Mile
Is it best to use 2x24Vac transformer or is a 2x18Vac transformer OK regarding this preamp regulator circuit

Thanks
Use 2x18v AC
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Old 16th November 2013, 12:24 PM   #2857
Vostro is online now Vostro  South Africa
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Use 2x18v AC
Thanks
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Old 16th November 2013, 04:14 PM   #2858
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apex which output will be good and natural AX-14 or NX-14
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Old 22nd November 2013, 06:10 PM   #2859
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Default AX20

Hi mr Mile ! I took so long but here I am like a snail walking ... with my first AX20 channel and NE555 protection, clip led, signal led and power led, in same pcb. Everything is working perfect, power supply +55VDC – 55VDC, DC ofset – 2,5mv. I changed C9 and C10 to 33pF to avoid visible oscilations, I replaced R16 to 1K5 to get enougf bias, 15mv across R33/5W. Is it normal to get 3,54V across colector/emiter of BD139? This amplifier sounds veeeeeeery good, sine wave is perfect, but when I use dummy 8R square wave, you can see the diference betwen with 1uF in paralel or without, is this normal ? In scope, you see 1KHz and 5V per div. I dont have over shooting obssesion anyway ... Output sine Wave 1KHz without clip: 8R 32VAC, 128W, 4R 30VAC, 225W. About supply for NE555 (12VAC) protection, what should I do ? Should I put a smal transformer for it, or get 12VAC from a special winding to the main transformer that I have to order. Thanks a lot Mile !!!!!!!!

Pozdrav
Attached Images
File Type: jpg SAM_0813.JPG (346.2 KB, 726 views)
File Type: jpg APEX AX20.jpg (529.0 KB, 664 views)
File Type: jpg SAM_0794.JPG (236.3 KB, 586 views)
File Type: jpg SAM_0793.JPG (233.1 KB, 512 views)
File Type: jpg SAM_0799.JPG (233.2 KB, 479 views)
File Type: jpg SAM_0816.JPG (326.6 KB, 209 views)
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Old 22nd November 2013, 11:02 PM   #2860
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Originally Posted by kandimba View Post
Hi mr Mile ! I took so long but here I am like a snail walking ... with my first AX20 channel and NE555 protection, clip led, signal led and power led, in same pcb. Everything is working perfect, power supply +55VDC – 55VDC, DC ofset – 2,5mv. I changed C9 and C10 to 33pF to avoid visible oscilations, I replaced R16 to 1K5 to get enougf bias, 15mv across R33/5W. Is it normal to get 3,54V across colector/emiter of BD139? This amplifier sounds veeeeeeery good, sine wave is perfect, but when I use dummy 8R square wave, you can see the diference betwen with 1uF in paralel or without, is this normal ? In scope, you see 1KHz and 5V per div. I dont have over shooting obssesion anyway ... Output sine Wave 1KHz without clip: 8R 32VAC, 128W, 4R 30VAC, 225W. About supply for NE555 (12VAC) protection, what should I do ? Should I put a smal transformer for it, or get 12VAC from a special winding to the main transformer that I have to order. Thanks a lot Mile !!!!!!!!

Pozdrav
Nice work... 12VAC supply for NE555 you can get from special winding to the main transformer.
Regards
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