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Old 1st December 2006, 06:41 AM   #21
hugz is offline hugz  Australia
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Thanks a lot Mr Pass. You're an asset to the DIY and Hifi community for making such interesting products and then allowing us to try them out for ourselves!

Any ETA on the full service manual? I cant wait to get to work on it, but I'd like to do as much reading as possible first because i'm a noob

Thanks again!
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Old 1st December 2006, 12:35 PM   #22
Vix is offline Vix  Yugoslavia
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Thank you Mr. Pass!

So, we can use N channel current source, and use a turn-on protection as described in Zen lite...(short the outputs via relays)
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Old 1st December 2006, 07:11 PM   #23
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Well, it's easy enough to feed the Gate of the N channel Mosfet
with an RC filtered circuit which comes up slowly.

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Old 1st December 2006, 07:54 PM   #24
Netlist is offline Netlist  Belgium
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Fig. 2 in the Zen V2 .pdf must do the trick nicely IMO.

According to the paper, the current source
"can be further developed into a current variable current source as seen in the Pass Labs Aleph amplifiers."
and: "it uses the same device as the gain transistor, both being the cheaper and more easily obtained N channel types."

So, I presume the F2 can also be further developed with an Aleph current source which will benefit the efficiency of the amplifier.

/Hugo
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Old 1st December 2006, 08:11 PM   #25
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You use an Aleph current source in a current source amp, but
it gets trickier. Feedback around the gain stage ensures
stability of the system, but when you run something like an
F2 with no feedback, you take a second look at stability when
applying AC gain in the current source.

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Old 1st December 2006, 08:29 PM   #26
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Netlist
Fig. 2 in the Zen V2 .pdf must do the trick nicely IMO.

According to the paper, the current source
"can be further developed into a current variable current source as seen in the Pass Labs Aleph amplifiers."
and: "it uses the same device as the gain transistor, both being the cheaper and more easily obtained N channel types."

So, I presume the F2 can also be further developed with an Aleph current source which will benefit the efficiency of the amplifier.

/Hugo
for me ,second important characteristic of Papa's messing with DIY crowd is his Lego approach ; he succeed in teaching us how to understand each Lego particle,and how to mix them in making something new ; at least new to inventor of sayed moment

first important characteristic is ,without doubt, his humorous way of thinking and presenting
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Old 1st December 2006, 08:33 PM   #27
Netlist is offline Netlist  Belgium
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In other words, since one of the important features of the F2 is a non feedback amp, adding an Aleph current source would make it another kind of amplifier.
Or...how complex can simplicity be.

/Hugo
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Old 1st December 2006, 09:53 PM   #28
steenoe is offline steenoe  Denmark
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Talking about Lego. Its quite funny to take the Lego approach.
Since many of the building blocks are used in several amps, its easy to plug these "Lego"-blocks together. Make yourself a little collection of CCS's and Reg's and you are ready to play

Steen
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Old 1st December 2006, 09:56 PM   #29
steenoe is offline steenoe  Denmark
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Some of them connected to a ZenV8 ampboard.
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Old 1st December 2006, 10:03 PM   #30
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by steenoe
.......................................

my man!

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