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Old 4th February 2013, 08:09 AM   #301
lycanlk is offline lycanlk  Sri Lanka
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Hi Apex and Hi everybody,

I'm back to the forum after 2 years I guess

Apex, thanks for the Amp. I always followed you on facebook

I'm gonna try this soon. I'm just checking whether the parts are available here in Sri Lanka.

I can't find a proper transformer to get +/- 75 or higher.

Can I couple 2 x 28-0-28/8A AC transformers that is 56 AC each rail to get +/-80

cheers!
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Old 4th February 2013, 10:32 AM   #302
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Quote:
Originally Posted by lycanlk View Post
Hi Apex and Hi everybody,

I'm back to the forum after 2 years I guess

Apex, thanks for the Amp. I always followed you on facebook

I'm gonna try this soon. I'm just checking whether the parts are available here in Sri Lanka.

I can't find a proper transformer to get +/- 75 or higher.

Can I couple 2 x 28-0-28/8A AC transformers that is 56 AC each rail to get +/-80

cheers!
D200 will work fine with +/-40V (28-0-28v AC), +/-80V is maximum and I suggest increase PSU voltage after test amp with +/-35V.
Regards
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Old 4th February 2013, 01:17 PM   #303
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Hi sir apex
if i change my D200 parts with original and good quality parts then you think it will work good in hi volume ?
for exapel change the 100n cap with MKT type
what are you thinking ?
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Old 5th February 2013, 07:23 AM   #304
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Quote:
Originally Posted by Hadighorbani View Post
Hi sir apex
if i change my D200 parts with original and good quality parts then you think it will work good in hi volume ?
for exapel change the 100n cap with MKT type
what are you thinking ?
Use BAV21 or MUR120 instead UF4007 and try with different inductor.
Regards
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Old 5th February 2013, 09:32 AM   #305
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thanks
i will try this
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Old 7th February 2013, 03:57 PM   #306
lycanlk is offline lycanlk  Sri Lanka
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My D200 is in progress..

But I doubt that I can find IRFB4227 in here.

I have IRF540N, IRFZ48N, IRF840 with me. I Can also find IRFP numbers. What is the best out of these instead of IRFB4227.

How can I change the frequency for that one for the best result?
Please mention the components to be changed.

Thanks
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Old 7th February 2013, 06:43 PM   #307
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Quote:
Originally Posted by lycanlk View Post
My D200 is in progress..

But I doubt that I can find IRFB4227 in here.

I have IRF540N, IRFZ48N, IRF840 with me. I Can also find IRFP numbers. What is the best out of these instead of IRFB4227.

How can I change the frequency for that one for the best result?
Please mention the components to be changed.

Thanks
Use IRFB31N20D or use IRF640N.
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Old 7th February 2013, 07:03 PM   #308
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Quote:
Originally Posted by apexaudio View Post
Use BAV21 or MUR120 instead UF4007 and try with different inductor.
Regards
hi sir apex
i was used bav21 but my problem not solved
what is the gate resistor for irf640n ?
thanks
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Old 7th February 2013, 09:53 PM   #309
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MR. Mile,can I use 74HC00 instead 74AC00 without any changes ?
it is hard to find 74AC00 in my local store.

Regards.
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Old 7th February 2013, 10:03 PM   #310
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Quote:
Originally Posted by Hadighorbani View Post
hi sir apex
i was used bav21 but my problem not solved
what is the gate resistor for irf640n ?
thanks
I use 47R for IRF640N, for IRFB31N20D and IRFB4227 use 22R or 10R.
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