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F5 discussions

Posted 23rd February 2010 at 06:57 PM by jtktam (Newbie audio DIYer)

http://hifi4sale.fullboards.com/equi...-amp-t2455.htm
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B1 Buffer BOM

Posted 23rd February 2010 at 06:54 PM by jtktam (Newbie audio DIYer)

2SK370 N channel JFET Transistor 4x (GR or BL grades)
1N914 Diode
Generic LED
15000 uF 2x Electrolytic 25v
10 uF 2x Film
1 uF 3x Film
1 ohm 3w
1k ohm 4x .25w
10k ohm 2x .25w
15k ohm .25w
25k ohm 2x .25w
221k ohm 2x .25w
1M ohm 6x .25w
2 way switch
RCA jack 6x
Linear Taper Pots 25k 2x
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F5 bom

Posted 23rd February 2010 at 06:49 PM by jtktam (Newbie audio DIYer)

R1 - R2 2 10R 10R - 1% - 0.6W
R3 - R4 - R15 - R16 4 2.2K 2.2K -1% - 0.6W
R5 - R6 - R7 - R8 4 100R - 3W 100R - 3W
R9 - R17 - R18 3 1K 1K - 1% - 0.6W
R10 1 100K 100K - 1% - 0.6W
R11 - R12 2 0.47R - 3W 0.47R - 3W
R13 - R14 2 47R 47R - 1% - 0.6W
R19 - R20 2 150R 150R - 1% - 0.6W
R21 - R22 2 10K to 22K (same value !) 10K to 22K - 1% - 0.6W
P1 - P2 2 5K Trimmer Vishay 64W/Bourns 3296 - 5K - 25 T
Q1 1 2SK170-BL (2SK370) N - Matched Idss
Q2 1 2SJ74-BL (2SJ108) P - Matched Idss
Q3 1 IRF9240P/FQA12P20 P - Matched Vgs
Q4 1 IRF240N/FQA19N20C N - Matched Vgs
Q5 1 ZTX550 (BC560) Zetex or similar - PNP
Q6 1 ZTX450 (BC550) Zetex or similar - NPN
TH1 - TH2 2 4.7K 4.7K - NTC - Thermistor - 3980K
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Pd f5

Posted 23rd February 2010 at 06:47 PM by jtktam (Newbie audio DIYer)

http://www.diyaudio.com/forums/pass-...ml#post1740824
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Mis-understood ArT

Posted 20th February 2010 at 12:03 AM by tomtt
Updated 21st February 2010 at 10:56 PM by tomtt

It's in the Script ...





Da·da or da·da (dädä)

A European artistic and literary movement (1916-1923) that flouted conventional aesthetic and cultural values by producing works marked by nonsense, travesty, and incongruity.

from here -

Dadaistic - definition of Dadaistic by the Free Online Dictionary, Thesaurus and Encyclopedia.

and theres this guy -

Click the image to open in full size.

... now a growing awareness, that andy was actually the

audience, watching the reaction/performance of the audience.


a recent portrayal of 'The Villain' crushing an Innocent,

has caused much excitement. (and excrement)


Click the image to open in full size.

this made the 'Innocent', a Colossal Star, by the very next...
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Old

Project Dilemas

Posted 19th February 2010 at 05:41 PM by kevinkr
Updated 19th February 2010 at 05:50 PM by kevinkr

Isn't it odd how sometimes the things you intend to do first end up being the last things you actually get done? Or am I the only one with this problem??

I always have a few projects on the back burner, and few that are supposed to high priority and sometimes one or two that just appear because of an unforseen opportunity or a seemingly good idea.

In order of supposed priority I have been working on a new GM70 based SE amp design, an acrylic plinth TT, a pair of Half Chili Changs, and quite unexpectedly an FFT based audio measurement set up.

The turntable and the GM70 are more or less stalled. I need to purchase a mini-lathe, and a good metal cutting blade.

On the GM70 despite designing a choke coupled driver stage that really performs well I am still waffling over whether I want to use IT coupling instead. And the kicker is I need the above tools to fabricate the chassis for these amplifiers which ultimately will be 4 chassis...
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Past and Present Reflections

Posted 17th February 2010 at 01:17 PM by smoketest

[originally written in May 2009]

Hello, my name is Brian and I’m a user. A Magnepan user. I, like perhaps many of you, have a mixed relationship with my Maggies. This is, in a way, a sad story of more than 20 years of listening dissatisfaction. At least until recently, but before we discuss that please indulge me the time to bore you with some history.

Consider your roaring twenties, or at least consider mine. In the early 1980s I was fortunate enough to bag a full set of precut particle board for a pair of Speakerlab K-Horn woofers. I added a 15 inch woofer, a full width Altec horn mid-range, a Heil tweeter, a home brew cross-over network and our little 2 bedroom house in West Palm Beach truly did roar. In fact our poor neighbor across the street had to walk over and ask us to turn it down a couple of times. With a borrowed Audio Research D-75A and a home made tube only pre-amp, it sounded like a rock concert.

After moving those behemoth speakers...
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Rating: 4 votes, 5.00 average.

PSU for High end audio without electrolytic capacitors

Posted 13th February 2010 at 06:18 PM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 10:45 PM by Nazar_lv

From article http://s-audio.systems/diy/psu-without-electrolytic-eng
----------------------------------------------

Electrolytic capacitors are constant part of power supply of audio devices, but in terms of sound he does not bring anything good, dispersion of sound quality-type of electrolytic capacitor is very large. Sonically the best types of electrolytic caps are Nichicon KZ, FG, Panasonic Pureism, Black Gate FK, NX, Elna Cerafine, Silmic II, Silmic,but the attempt to eliminate from PSU electrolytic capacitors was very successful, instead is used "electronic capacitor" (right side of the circuit).
It is global negative feedback free electronic substitutes, that has a low and stable impedance 0,1...0,2Ohm (equivalent to cap 40000u) in the band to megahertz shunting NP0 0,1 microfarads Murata GRM31 in close to chips, it completely detach regulator (317\337) from load, therefore we have the ideal transient response when load "changes",...
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Old

My F4 Guide

Posted 11th February 2010 at 06:36 AM by cviller
Updated 2nd November 2012 at 09:11 AM by cviller

This is a guide to building a F4 using my boards, but you may be able to find some useful information here even if you use other boards.

The boards are based on the schematics from Nelson Pass's FirstWatt F4. You can get the service/user manual here: First Watt: Products: F4

You might want to check out the GB thread here: http://www.diyaudio.com/forums/group...gb-f4-pcb.html

PCB
Here is a picture of the pcb.
Click image for larger version

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Errata
There is a trace error around R22. I have cut the traces on most of the boards I have sent - and the rest of the batch will be cut before I send them out.

These are the cuts which needs to be made:
Click image for larger version

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And the green lines indicate where a connection must be made:
Click image for larger version

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This can be done simply by having the leg of R22 go through the hole and to the side.

Schematics...
Attached Files
File Type: pdf F4R0.pdf (87.7 KB, 1409 views)
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