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Old 2nd May 2007, 08:24 PM   #521
Netlist is offline Netlist  Belgium
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The most interesting discussion about a preamp for the F4 can be found here:
Improving on X-BosoZ to mate the F4

Hugo
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Old 2nd May 2007, 09:48 PM   #522
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Quote:
Originally posted by Netlist
The most interesting discussion about a preamp for the F4 can be found here:
Improving on X-BosoZ to mate the F4

Hugo
Thank u for that !!! the speed of this thread was almost quicker then the speed of light !

Anyone have an update about his F4 ? no ok I'll give it a try

Today i received my secondhand heatsinks, the sk56 from fischer at about 200mm height they will do 0,3 C/W. I also using these on my aleph 5's. I planning to build first one stereo F4 and later on i will build an other one so I can use them balanced.
I'm currently searching for a nice toroid 300VA or something like that.
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Old 2nd May 2007, 10:00 PM   #523
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Quote:
Originally posted by analogair
.....................
I know they should be rated as having a sencitivity at 96dB/1m/ 8w

................

93db/1m/4W
90db/1m/2W
87db/1m/1W
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Old 2nd May 2007, 10:04 PM   #524
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Jaac TheMaster-

Nice bookends!
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Old 2nd May 2007, 10:07 PM   #525
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by Jaac TheMaster
the speed of this thread was almost quicker then the speed of light !
Blame Zen Mod.

I have split everything past post #530. Credit for spotting goes to cviller. If anything needs to be put back into this thread, just mail me the post numbers and I'll comply.

/Hugo
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Old 2nd May 2007, 10:13 PM   #526
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Quote:
Originally posted by BrianDonegan
Jaac TheMaster-

Nice bookends!
thanks !! A welder, some iron voila
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Old 2nd May 2007, 11:18 PM   #527
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Quote:
Originally posted by analogair
.... a pair of B&W Matrix 801 Series 2

I know they should be rated as having a sencitivity at 96dB/1m/ 8w

I somehow am pretty sure that the are harder to drive than that, so if someone have some real life specs...
I have been reading a lot of articles about my speakers, and some writes about them having lower sencitivity than the mentioned 96dB/1m/8w.....Anybody ?

Quote:
Originally posted by Zen Mod



93db/1m/4W
90db/1m/2W
87db/1m/1W
84db/1m/ .50W
81db/1m/ .25W
78db/1m/ .125W
.
.
.
I know the math, but thanks anyway Zen Mod


Sorry for the off topic guy's
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Old 6th May 2007, 11:07 AM   #528
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Thanks to Peter Daniel I corrected one mistake on my PCB for this amplifier - Q2 was inverted. Now everything is OK. For those who made this PCB in previous version - all you need to do is invert this transistor.

http://www.unisonus.com/pdf/f4_r0_pcb.pdf
http://www.unisonus.com/pdf/f4_r0_top_mirror.pdf
http://www.unisonus.com/pdf/f4_r0_sch.pdf
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Old 6th May 2007, 05:31 PM   #529
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What effect would having Q2 inverted have on the amp? Would that mean it was not working as a push-pull amp and (if I understand correctly).

Would there be any damaged components I should check for (aside from Q2).

I have built Veteran's layout, but since my speakers are all very inefficient, I haven't put many hours into running it so far

Thanks,

Stephen
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Old 6th May 2007, 06:02 PM   #530
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Those are P channel FET transistors. In low current application there shouldn't be no difference how you connect them - this is result of production technology which is not perfect
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