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26th September 2005, 11:25 AM
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#23 |
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Account Disabled
Join Date: Nov 2004
Location: thailand
 
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Pardon me please...SKY CHU
A picture that you had posted is really FET -10HL
 But now I want to know about it's voltage power supply rails. I had seen SKY CHU said "+/- 25V really ? But on www.diyzone.net told me +/- 12V ?!? Now it'll be to a mega project with 2SK389 instead of 2N5566, BS250 instead of 3N172...PCB is coming soon. Does anyone can find ERO CAP MKT1813 10uF/100V ? regard AHT |
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26th September 2005, 11:57 AM
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#24 |
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Account Disabled
Join Date: Nov 2004
Location: thailand
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This's original pcb
But I don't use it's power supply because I have specially supply more than which one.It's use voltage error correction by reference voltage of 78L12/79L12 flow through UA741 for compared voltage IN:OUT and used 2N3055/MJ2955 for variabled current output :-) (this concept come from hi-end DAC power supply)
I hope there is somebody interested this concept  regard AHT |
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26th September 2005, 12:09 PM
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#25 |
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Account Disabled
Join Date: Nov 2004
Location: thailand
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This's schematic of Threshold Fet-10HL
After I asked Mr.NP he told me that 2SK389 can instead of 2N5566 then I just to do it for a project.
Input of them are 2SK389BL (jfet) in parallel mode cascode with bipolar transistor for reduce capacitance and use transistor ccs. BS250 (mosfet) used for matcing impedance of 1st stage & 2nd stage, output stage is normally push-pull bipolar transistor such as KANEDA & JC2, I think a perfect matched parts enough for set sound quality & stability. Now I used this circuit & Aleph P1.7 in different case so don't ask me for compare both them regard AHT |
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26th September 2005, 12:34 PM
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#26 |
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Account Disabled
Join Date: Nov 2004
Location: thailand
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This's my power supply schematic
I can't remember I got this schematic from...?
But it's can use with several circuit such as phono stage, preamp, DAC, etc. Now I got some problem with output capacitor filter because original supply from www.diyzone.net don't use it or they're use 1uF on preamp board ?!? regard AHT |
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30th September 2005, 02:27 AM
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#27 | |
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diyAudio Member
Join Date: May 2002
Location: Taiwan
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Re: Pardon me please...SKY CHU
Quote:
I said "the output of extend power supply box is +/- 25V"
__________________
Sky Chu |
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30th September 2005, 01:06 PM
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#28 |
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diyAudio Member
Join Date: Sep 2005
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Hi, I'm new about solidstate
Does anybody tell me what's THRESHOLD ? (threshold current = ?)
Sorry for my so easy question ANALOG GUY |
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30th September 2005, 10:33 PM
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#30 |
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The one and only
Join Date: Mar 2001
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I recall the schematic as follows:
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