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Old 15th May 2007, 08:02 PM   #621
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The biggest difference is the more elaborate volume control,
rendered in discretes instead of surface mount, more inputs,
separation of digital control and the two channels, and we make
the technicians wash their hands before they touch them.

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Old 15th May 2007, 08:30 PM   #622
Zen Mod is offline Zen Mod  Serbia
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tnx Papa,as always............

please- be sure to pour few glasses from me.....when you arrive at
AR2 's (Simovic......crazy photographer) place ..........

I suppose that this is most important :

Quote:
Originally posted by Nelson Pass
...................................... and we make
the technicians wash their hands before they touch them.


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Old 15th May 2007, 09:48 PM   #623
Jaac is offline Jaac  Netherlands
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Quote:
Originally posted by Nelson Pass


Try it and see if it has enough gain and swing for you. If not,
build something else...


Quote:
Originally posted by Nelson Pass
If you built it yourself, you can always scale the gain and power
supply up to get what you need.

maybe its handy to put something like "First build then ask" in your signature.
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Old 15th May 2007, 10:08 PM   #624
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Quote:
Originally posted by Nelson Pass
and we make
the technicians wash their hands before they touch them.

see the article in EDN about the PCB corruption and femto-Ampere problems...because folks didn't wash up after using the terlet.
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Old 16th May 2007, 06:17 AM   #625
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by lykkedk
Hi.

I am currius if someone have a pcblayout, which fit for the R0 4/17/07 ? - There is some issue with the 'IN' connection etc... ?

Also i would be very pleased, if someone could explain how much 'preamp' it would take to drive the f4 in a full balanced dual-mono block (4 pcb's + 2 torrids 2x18v 500VA).
It's not that i did not read this thread, and the 'mate for f4' thread also, but there is so much talk about voltage-swing / db-gain etc... that i am a bit confused.

I had been listening to the f4 at Steenoe's placed (I also mentioned this earlier in this thread), and i am in no doubt, that this amplifier sounds very veery good, and that i really would like to build one myself. I through have a slight feeling, that i would have a problem with my speaker/preamp setup, which was discussed in the 'mate for f4 thread' too...

Well, i have not so much acknogledge about the db / voltage-sving things, so please be gentle, if someone would try to explain this to me !

Jesper
Hi Jesper. As far as I remember you have a X-BosoZ? Did you try to raise the gain? Try to increase R18 and R19 on this sch. to 80k-100k. That will give you all the gain you need. 100K is 19dB gain in theory, but its much better to just try it out

Quote:
"First build then ask"
I really like that one

Steen
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Old 16th May 2007, 01:37 PM   #626
Manu is offline Manu  Europe
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Quote:
Originally posted by Nelson Pass
If you built it yourself, you can always scale the gain and power
supply up to get what you need.


According to the service manual of the Aleph L , the gain can be adjusted by changing the value of the input resistor(s) 47K gives 0dB gain, 22K 6dB, and 10K 12db. With 5K we will get 22dB and I guess it would be too much. Or not?
With 7K5 will we get about 18db? Must be "just jake" to drive the F4? Can I go for it?

- What would be the effect of upping the supply voltage (to 70V may be) ?
Yes yes i should try... and see the result . But I just would like to understand what I do.

Thx in advance
Manuel
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Old 16th May 2007, 02:24 PM   #627
lykkedk is offline lykkedk  Denmark
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Steenoe :

Quote:
Hi Jesper. As far as I remember you have a X-BosoZ? Did you try to raise the gain? Try to increase R18 and R19 on this sch. to 80k-100k. That will give you all the gain you need. 100K is 19dB gain in theory, but its much better to just try it out
Sorry about that, its a 'normal' old fashion bosoz running unbalanced right now..

Well my bosoz is with 124ohm (13,5db in my setup) for maxium gain, but somehow i feel, it's not enough, that's why i asked if the x1 delivered the stuff somehow differently ?

Maybe i will take a closer look, at the aleph p 1,7, which seem's' like a bit more heavy, than my bosoz, and i think i could use my +rail from my bosoz to test it.

Jesper.
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Old 16th May 2007, 03:28 PM   #628
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Quote:
Originally posted by lykkedk


Well my bosoz is with 124ohm (13,5db in my setup) for maxium gain, but somehow i feel, it's not enough, that's why i asked if the x1 delivered the stuff somehow differently ?

If you change the 124ohm lower, you could get your maximum
gain higher as much as you like.


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Old 16th May 2007, 05:17 PM   #629
lykkedk is offline lykkedk  Denmark
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Ok... thanks i might give it a try -

EDIT: ok i think then i will have to match the mosfets
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Old 16th May 2007, 07:04 PM   #630
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by lykkedk
Ok... thanks i might give it a try -

EDIT: ok i think then i will have to match the mosfets
I dont think you need to be so concerned Just try to raise the gain as Babowana suggests.

Steen
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