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Old 11th December 2011, 11:56 AM   #411
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Originally Posted by leonatax View Post
Sir Apex what do you think about this security system it is for 6 chanel but only for 32+- volts what can I do to use it for 40+-vdc psu
Connect 15V zener in series with relays
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Old 11th December 2011, 12:12 PM   #412
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Thanks
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Old 13th January 2012, 11:10 AM   #413
viki_v2 is offline viki_v2  India
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Hello Mile,
I will be making SR200 v2.2 With Sanken 2sc2922-2SA1216.
What should ve voltage and Current Requirement for 1 pair and 2 pairs.
As well What will be the output with Single pair and 2 Pairs.
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Old 13th January 2012, 11:39 AM   #414
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Apexaudio,

Some time ago I asked about the possibility of using a dual fet at the input, probably improving offset quite a bit and following paths high quality amps have followed.

Any news on that or hint on how to do it?
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Old 15th January 2012, 11:49 AM   #415
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Default Driver TR?

Hi Apex,
I will try to make new PCB design for SR200, it hard I guess
I want to ask it is ok if I separate driver A1837/C4793 from main heatsink?
so the PCB is not so big
I saw your SR400 component side, there is only VBE multiplier (BD139) on main heatsink...
Also can replace A1837/C4793(out of stock here) with A968/C2238(I have some)?

Regards
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Last edited by JOHN BALI; 15th January 2012 at 11:55 AM.
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Old 15th January 2012, 03:03 PM   #416
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Originally Posted by JOHN BALI View Post
Hi Apex,
I will try to make new PCB design for SR200, it hard I guess
I want to ask it is ok if I separate driver A1837/C4793 from main heatsink?
so the PCB is not so big
I saw your SR400 component side, there is only VBE multiplier (BD139) on main heatsink...
Also can replace A1837/C4793(out of stock here) with A968/C2238(I have some)?

Regards
You can use A968/C2238 on separate heatsink, output stage of SR400 is TEF, MJE340/350 are predrivers on separate heasinks, and one pair A1493/C5200 is drivers on main heatsink with outputs.
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Old 15th January 2012, 03:07 PM   #417
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Apexaudio,

Some time ago I asked about the possibility of using a dual fet at the input, probably improving offset quite a bit and following paths high quality amps have followed.

Any news on that or hint on how to do it?
I work on new amplifiers using dual fet at the input, one will be in thread '100W Ultimate Fidelity Amp' and second will be here.
Regards
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Old 15th January 2012, 06:27 PM   #418
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Thanks, Apexaudio. Looking forward to it.

Also curious on what might be different between those two, as the inputs are very much the same on both.
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Old 15th January 2012, 09:48 PM   #419
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Originally Posted by carlmart View Post
Thanks, Apexaudio. Looking forward to it.

Also curious on what might be different between those two, as the inputs are very much the same on both.
VAS is different like in AX and SR amps.
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Old 19th January 2012, 11:57 AM   #420
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Sir APEX can I use BC557c(b) BC547c(b) instead of BC560c BC550c, or BC550b-560b
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