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Old 19th April 2012, 08:47 PM   #12231
MaHo is offline MaHo  Slovakia
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500VA 2x 18V
66000uF per rail
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Old 19th April 2012, 11:13 PM   #12232
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Default Single Supply?

Hello,

just wondering, is it possible anyway to run the F5 on a single supply?
(48V instead of +-24V)

Happy listening!
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Old 19th April 2012, 11:17 PM   #12233
Zen Mod is offline Zen Mod  Serbia
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it is , in few different ways .

but - with slightly revised sch , either of amp or supply itself

for later , take a look at Quad 606 PSU
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Old 19th April 2012, 11:18 PM   #12234
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by MaHo View Post
500VA 2x 18V
66000uF per rail
3A15 , slow blow
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Old 19th April 2012, 11:31 PM   #12235
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Quote:
Originally Posted by Zen Mod View Post
it is , in few different ways .

but - with slightly revised sch , either of amp or supply itself

for later , take a look at Quad 606 PSU
Okay,

I would like to put the positive +48v at one "IRFP source-side" and ground at the other Source adding an output capacitor about 10mF or so at the Drains, using a single secondary winding rectified and smoothed to one rail +48v..

But i'm unsure how that will effect the VAS/input stage and the feedback network.
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Old 19th April 2012, 11:45 PM   #12236
Zen Mod is offline Zen Mod  Serbia
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I'll answer tomorrow , with best option
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Old 20th April 2012, 09:26 AM   #12237
Zen Mod is offline Zen Mod  Serbia
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look at attached schm

make your PSU in same manner , with two bjt's potential divider

feel free to use slightly stronger type of bjt's , something in range of BD139/BD140 , but with higher beta

that solution , even if compromise comparing to regular FW PSU , is certainl bettr than messing with amp circuit itself , thus decreasing it's PSRR
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Old 22nd April 2012, 07:05 AM   #12238
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Is the F5 a goood choice for these new ortho headphones that need 2W across their 38 ohm voice coils? So roughly 9Vrms with 238 mA.
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Old 22nd April 2012, 09:43 AM   #12239
Zen Mod is offline Zen Mod  Serbia
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make some mini version

and be careful with that axe , Eugene ........... 9Vrms will not fry just your ears ..........

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Old 22nd April 2012, 01:04 PM   #12240
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Quote:
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Is the F5 a goood choice for these new ortho headphones that need 2W across their 38 ohm voice coils? So roughly 9Vrms with 238 mA.
Take a look at Dick Marsh's new headphone amplifier in Linear Audio "A Headphone Buffer/Amplifier and Auto EQ for Headphones" -- sims out really good down to 30 ohms.
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