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and now for something completely different part 3


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I'll have the working unit at the MD/DC/VA meet tomorrow. Amp sounds great!

http://www.head-fi.org/t/754656/dc-area-head-fi-meet-george-mason-regional-library-sunday-april-12-2015-noon-5-pm

George Mason Regional Library

George Mason Meeting Room (on your left right after the entrance).

Date: SUNDAY. APRIL 12, 2015

Time: 12:00 Noon to 5:00 PM

Location: 7001 Little River Turnpike, Annandale, VA 22003

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Close to finish casing my balanced CFP amp. Waiting for a 4-pin XLR socket. This one runs on 26VDC rails and 220mA bias current.  I am posting an unfinished amp because I want to report that

So when I got my case I got pretty upset with the looks of the power switch: So I search around the house for what could be used to improve this and found and unused aluminum kitchen drawer

Another CFA is alive and well. Sorted out the issue with the bias when using the SS/ZF switch by doing the following (board rev 1.2): - Remove the 4 ZF jumpers near the 600pF - Increase R44/

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by the way fully balanced version coming.

 

lots of parts!

 

100% differential

100% complementary

 

http://gilmore.chem.northwestern.edu/cfa3production.pdf

 

not sure why it took me years to come up with this

 

NO FEEDBACK of any kind

thd <.005%  and absolutely flat over the 10hz to 200khz

 

frequency response +0, -3db   .017hz to 4.43 MHz

Edited by kevin gilmore
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well the phase splitter is just the ubal to bal board.  and then there are pieces missing.

plus you would have to build 2 more boards anyway.

 

http://gilmore.chem.northwestern.edu/cfa3.jpg

 

for your thing, you could just adjust the gain to 1 and then use the ubal to bal board.

 

the stax mafia moves at light speed ::)

 

someone really needs to check this one over hard.

 

the miracle of cut and paste is not necessarily foolproof.

 

this is probably as close as I can get to the ayre stuff without actually having the schematics.

 

I could go all krell on this and stuff it full of power supply caps...

Edited by kevin gilmore
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preamp plus power amp please.

 

I will send it back.

 

actually more interested in the amp, because I know I'm extremely close on the preamp part.

 

this really should be the end all dynamic amp, with 80 volts peak to peak output and up to

2.5 amps (more with a bigger heatsink) it should drive both hd800 and he6.

 

you could actually put the volume control in the middle for even more reduced noise, although

the noise is about 95db down.

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I'm sure I will add that.

 

found a bunch of errors which hopefully I fixed.

 

and I took out the surface mount transistors because they are only 200mw  and there are a few places where its 270mw

 

picture updated

Edited by kevin gilmore
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Ah, looks a little different than what I thought. I'll get the single ended version cased up before I move to the balanced one, which I think I will. Whats a few more boards. :)

Got a lot of puzzled faces at the meet today.... people somehow expect less when all the guts are hanging out. Once jacked in, it was all smiles and amazement. Most people preferred it to the Krell clone.

well the phase splitter is just the ubal to bal board. and then there are pieces missing.

plus you would have to build 2 more boards anyway.

http://gilmore.chem.northwestern.edu/cfa3.jpg

for your thing, you could just adjust the gain to 1 and then use the ubal to bal board.

the stax mafia moves at light speed ::)

someone really needs to check this one over hard.

the miracle of cut and paste is not necessarily foolproof.

this is probably as close as I can get to the ayre stuff without actually having the schematics.

I could go all krell on this and stuff it full of power supply caps...

Edited by GrindingThud
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started to look at the layout for the phase splitter + cfa output

 

does your legend apply to the output only, or both sections? your schematic has 2s* parts in the phase splitter, and I seem to remember there being a version of the ubalbal board that accepts mps* parts.

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