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Old 4th February 2013, 03:04 PM   #701
HighTec is offline HighTec  Croatia
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Originally Posted by nigelwright7557 View Post
It depends on how long it is switched on for and if the case has openings for airflow.

I used a similar setup in a pc case and after a couple of hours of high power I couldn't bear my hand on the pc case. So I fitted a couple of fans and it was fine after that.
Well, if he's gonna listen only reggae and stays away from techno, then fans are no needed.

/me joking
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Old 7th February 2013, 07:41 AM   #702
miligor is offline miligor  Serbia
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Originally Posted by Rikard Nilsson View Post
If you want to reduce distorsion significantly, you could add another set of transistors identical to Q8, Q9 connected to R11 in the same way Q8 and Q9 are connected to R10. The collector of the "new" Q9 connected to ground. The emitter of "new" Q8 connected to the old Q8.

And the same for the negative side. This way, the VAS is configured as a differential amp and is very likely to produce severly improved linearity. I will try this in my own amp soon, but the sims show very promising results.

Mile, what do you think about this? Reducing distorsions significantly? I'm not completely understand what can I add? Sta mislis o ovome? Svidja mi se ono o drasticnom smanjivanju izoblicenja, ali mi nije bas jasno sta treba da dodam?
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Old 5th April 2013, 07:18 PM   #703
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Originally Posted by miligor View Post
Mile, what do you think about this? Reducing distorsions significantly? I'm not completely understand what can I add? Sta mislis o ovome? Svidja mi se ono o drasticnom smanjivanju izoblicenja, ali mi nije bas jasno sta treba da dodam?
This is old forgotten design, many improvement is possible but I don't want get back to redesign HV23, I want keep it simple. If someone want to upgrade this amp please just go ahead.
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Old 5th April 2013, 10:21 PM   #704
44250 is offline 44250  Serbia
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what else would you suggest to do instead HV23 and to use itīs output mosfets and power supply?
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Old 5th April 2013, 10:43 PM   #705
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Originally Posted by 44250 View Post
what else would you suggest to do instead HV23 and to use itīs output mosfets and power supply?
There is nothing better than HV23 if you want to use IRFP240/9240 mosfets for amplifier.
Regards
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Old 6th April 2013, 11:02 AM   #706
44250 is offline 44250  Serbia
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excuse me for off-topic:is there a thread of apex d200 on this forum,Mile?
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Old 6th April 2013, 12:49 PM   #707
44250 is offline 44250  Serbia
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excuse me for off-topic:is there a thread of apex d200 on this forum,Mile?
found it found it,found it...
.
sorry for OT once again!
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Old 4th August 2013, 04:42 PM   #708
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hi apexaudio kan we switch the bc327 and the bc337 to bc639 and bc640 in the hv350 thanks
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Old 4th December 2013, 02:16 PM   #709
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Originally Posted by chris305 View Post
hi apexaudio kan we switch the bc327 and the bc337 to bc639 and bc640 in the hv350 thanks
Yes but pins are different
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Old 4th December 2013, 09:22 PM   #710
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Redrawing mistake. 2N5551 and 2N5401 wrong notification, corect on this schematics. 2SC2383 replaced with MJE340, 2SA1013 replaced with MJE350 in newer version both are OK. 2SB861 and 2SD1138 in VAS can be used too.
Hello apex,

but if you use 2sa1013, 2sc4793, 2sa970, 2sa1837, 2sc2240, as indicate in the first electric scheme HV23, I have problems?....
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