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Old 16th July 2010, 06:37 AM   #301
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Quote:
Originally Posted by mathez View Post
what instead for irfp240/irfp9240?out of stock here
2sj200/2sk1529
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Old 16th July 2010, 06:50 AM   #302
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Thanks Mile...
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Old 23rd July 2010, 04:14 PM   #303
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Default My PCB work without the Toshiba Transistors

Hi, anybody interested in my PCB work for HV350.2 without the Toshiba transistors. I replaced all the 2SA/2SC series Toshiba transistors with available 2N series. I cont find the Toshiba transistors in my city so i cont comment the performance difference b/w the original apex design and my design.

Just now i finished the design work so i didn't tested that.......

I will post my pictures after the testing now find the attachment ......

Thanks Mile

Regards
Udhay
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File Type: pdf HV350V2.pdf (104.0 KB, 1697 views)
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Old 25th July 2010, 03:08 PM   #304
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Quote:
Originally Posted by udhay_cit View Post
Hi, anybody interested in my PCB work for HV350.2 without the Toshiba transistors. I replaced all the 2SA/2SC series Toshiba transistors with available 2N series. I cont find the Toshiba transistors in my city so i cont comment the performance difference b/w the original apex design and my design.

Just now i finished the design work so i didn't tested that.......

I will post my pictures after the testing now find the attachment ......

Thanks Mile

Regards
Udhay
Thanks for share your pcb design,
Regards
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Old 30th July 2010, 12:06 PM   #305
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Quote:
Originally Posted by udhay_cit View Post
Hi, anybody interested in my PCB work for HV350.2 without the Toshiba transistors. I replaced all the 2SA/2SC series Toshiba transistors with available 2N series. I cont find the Toshiba transistors in my city so i cont comment the performance difference b/w the original apex design and my design.

Just now i finished the design work so i didn't tested that.......

I will post my pictures after the testing now find the attachment ......

Thanks Mile

Regards
Udhay
On your pcb track from emiter of BC546 (clip indicator) to -75V missing.
Regards
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Old 6th August 2010, 05:07 PM   #306
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Quote:
Originally Posted by homemodder View Post
Hi Apex, i dont think your vas is unusal, its a cfp, I use it in alot of my amps, what is unsual is the your temp compensatiom circuit, Im still guesing how it could work.
The thought has come to mind that the cfp transistor that gets mounted on the heatsink has something to do with it but Id have to build it to see the exact effect.
Yes CFP in VAS give temp compensation to the amp, but when amp is hot this circuit reduce bias to almost half of adjusted current: 200mA to 120mA per MOSFET, that is the reason to add Vbe multyplayers with one transistor on heatsink and other not, there is no problem with underbiased. Temp compensation without underbiased can be made with LED in emiter of Vbe multyplayer like in my DC Servo Mosfet Amp.
Temp stability of this amp in usual home aplication is satisfacted, and underbiasing with full power in PA aplication reduce disipation.
Any version of this amp work great, and build it to see effect.
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Old 6th August 2010, 10:15 PM   #307
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Hi Apex. Is the heatsink with dimension 300x190.5x56 mm enough for the stereo version of the APEX350.2 amplifier?

Regards.
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Old 6th August 2010, 11:52 PM   #308
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Originally Posted by najjachi View Post
Hi Apex. Is the heatsink with dimension 300x190.5x56 mm enough for the stereo version of the APEX350.2 amplifier?

Regards.
Yes this heatsink is enough for stereo (see post #246), only for PA you need to add fan cooler,
Regards

Last edited by apexaudio; 6th August 2010 at 11:54 PM.
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Old 7th August 2010, 12:50 AM   #309
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thanks!
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Old 7th August 2010, 02:35 PM   #310
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Heatsinks from post #246 are made of recicled aluminium by melt, and have only half wait compare to industrial.
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