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Old 15th August 2012, 06:43 PM   #31
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Currently not much beyond what is in post one. Buzzforb has got some pics on the general thread of the production while boards as well, I can steal and port over here if needed.
I orginally purposed the board so one could use the available TO-220 FQP fairchild versions, since availablility of the actual Fairchild pair is limited, but Buzz has been delivering sets that work for that as well. If you run these as a version 2 or 3 with lower bias, you can get this into a 'normal' chassis.
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Last edited by Tea-Bag; 15th August 2012 at 06:44 PM. Reason: buzz beats me to the punch.
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Old 15th August 2012, 06:47 PM   #32
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Considering the lower bias point. Nelson runs his XA amps with higher output count and lower bias vs low output count and high bias. I hope to post numbers with 2 pairs at bias levels from the article, and 4 pairs with bias levels cut in half. All of this on a normal Class A amp frame, as TeaBag has suggested.

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Post #351 for pics of the boards populated.
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Old 15th August 2012, 06:55 PM   #33
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as discussed but not surely concluded in the other thread - I think the amount of bias might depend a lot on when someone goes into clipping during normal listening - will it possibily sound worse than with fewer devices or more at higher bias?

Myself, using as a bass-amp - I tend to not be able to notice the transition - but just want the raw current for transient power to 2x 15" woofers on each channel. But I would imagine a 3 way 82db full box would notice the transition if crancked up and would hear it barf on the midrange more. Keep in mind, this is the highest powered FW design AB design so far - so maybe as good as it gets for people with inefficient speakers they love.

The different amount of feedback and gain do make i sound as nelson describes it, a more relaxed but confident amp. It makes the normal F5 sound a little meth'd out by comparison.
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Last edited by Tea-Bag; 15th August 2012 at 07:05 PM.
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Old 15th August 2012, 07:12 PM   #34
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Total bias will affect ultimate performance into tougher loads. My experiment is more about comparing the sound and measurements of 2 vs 4 pairs, with the same total bias.
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Old 16th August 2012, 10:45 PM   #35
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TRicked out of course
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Old 29th August 2012, 03:15 PM   #36
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@Tea Bag: I like this PCB. Could you ship to Vietnam?
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Old 29th August 2012, 03:42 PM   #37
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Quote:
Originally Posted by lehuy173 View Post
@Tea Bag: I like this PCB. Could you ship to Vietnam?
Yes, I can ship anywhere there are no US Postal Service restrictions. I have shipped there a few times too. If lost packages are a problem for anyone - I can do registered mail, but the shipping is usually 15.00 extra than normal.

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Old 2nd September 2012, 02:33 PM   #38
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I've gotten quite few request for some power supply boards.
Is this something you guys are interested in? I can talk with LaOde, the Cad man, about putting something together. The Aleph supply off Chipamp, works, but people may be looking for something a little different (More,less,caps), diodes, no diodes on board etc.
Let me know. I will add a column in the GB for this - but not commited to anything yet. Just to see if there is interested.
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Old 2nd September 2012, 03:09 PM   #39
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I think it would be well received. I know a lot of folks are hesitant about the F5T just because they are unsure of ToeCutter's intentions.
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Old 4th September 2012, 01:55 PM   #40
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Anyone want to tell me what brand and model caps they would use on a potential power supply board? CRT wants to make sure the snap in holes punch out right.

Looks like this would be the max voltage, capacitance and size from Panasonic.
ECE-T1JP223FA Panasonic Electronic Components | Mouser



It looks like I want to do 4x 40mm diameter caps for each rail (8 total - but maybe 6 to make smaller). Looks like a 220mm x 90mm or so board. With a V-score break off to mount MUR3020 diodes. It will not really be compact, but should fit into a fairly shallow 12-13 inch chassis with maybe the tranny mounted sideways. Will have LED indicators, C-R-C, with bypass caps, screw down terminal mounts for the wires.



Let me know cap preference. We can make this happen.
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Last edited by Tea-Bag; 4th September 2012 at 01:59 PM.
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