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Old 14th July 2010, 02:38 PM   #291
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Default Hv23 bias compensation

Quote:
Originally Posted by apexaudio View Post
I dont use this PCB in a last 2 year (repleced with H class in PA and A class for home aplication), but I must build couple PCBs again and try to see the effect on some sugestion.
I set bias to 200mA, after 10min. amplifier was hot and bias decrease to 120mA. That's the fact for people who don't belive that HV23 have thermal stability. Thermal compensation with transistor in new version is need for do not underbiased not for overbiased amp.
Regards

Last edited by apexaudio; 14th July 2010 at 03:06 PM.
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Old 14th July 2010, 03:57 PM   #292
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Originally Posted by apexaudio View Post
Look nice, but you must put driver transistors on heatsink with outputs, drivers work with 30mA bias and must be on heatsink. Better use some TO220 for drivers.
Regards
Yes thank you. But i already mention this is only for testing and now i am not using this amplifier. I am doing PCB work for final design,after that i will attach to heat sink and i didn't select an output transistor yet but i am thinking about MJE15032 & 33. What is your suggestion......

MJE15032 & 33 are not available in my city. It is only available in DIGIKEY. So may i use MJE350 & 340. It's get heat little more then output driver MOSFET(for +/-33 supply). Is it happen normally or anything wrong?
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Old 14th July 2010, 05:17 PM   #293
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Quote:
Originally Posted by najjachi View Post
hi apex it's me agin. can you post new picture of PCB of HV350.2 for print because some points on the PCB are in brown color example the points of the output transistors.
Regards.
OK?
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File Type: jpg APEX HV350mk2 pcb.jpg (299.0 KB, 1363 views)
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Old 14th July 2010, 05:30 PM   #294
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Quote:
Originally Posted by udhay_cit View Post
...........MJE15032 & 33 are not available in my city. ..............
Go through an EFY ( Electronics For You ) magazine and contact parts suppliers from Mumbai and Bangalore . All you need to do is send an email and request for the part you want. You can get it fairly easily I think. Many suppliers respond to email requests now. Shipping isn't expensive.
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Old 14th July 2010, 08:33 PM   #295
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Default Pcb

Quote:
Originally Posted by apexaudio View Post
Simple Full Complementary Simetry +/-80V. Voltage amplifier/driver biased with 30mA. This driver circuit stabilized BIAS in output stage. Exelent stability without oscilation, hum and noise, sound great.
RMS Power: 240W 8ohm, 350W 4ohm
Hi Mile,

Do you have the PCB of this 10 mosfets amp project?
HV23? Post #1

Thanks,

Joel
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Old 14th July 2010, 09:56 PM   #296
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it's ok. thanks
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Old 15th July 2010, 06:46 PM   #297
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Quote:
Originally Posted by Tube Pro View Post
Hi Mile,

Do you have the PCB of this 10 mosfets amp project?
HV23? Post #1

Thanks,

Joel
Yes, but I not recomand to use +/-90V with IRFP240/IRFP9240, no metter if U use 5 or more pairs mosfets,
Regards
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Old 16th July 2010, 06:05 AM   #298
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Quote:
Originally Posted by apexaudio View Post
Yes, but I not recomand to use +/-90V with IRFP240/IRFP9240, no metter if U use 5 or more pairs mosfets,
Regards
How about +/- 80vdc for 5 pairs IRFP240/IRFP9240?
What's Pout @ 8 ohms?

Thanks,

Joel
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Old 16th July 2010, 06:19 AM   #299
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Quote:
Originally Posted by Tube Pro View Post
How about +/- 80vdc for 5 pairs IRFP240/IRFP9240?
What's Pout @ 8 ohms?

Thanks,

Joel
275W/8R
Regards
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Old 16th July 2010, 06:35 AM   #300
mathez is offline mathez  Indonesia
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what instead for IRFP240/IRFP9240?out of stock here
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