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and now for something completely different part 3


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1 hour ago, Pars said:

Now there is a HC approved overkill transformer!

The two trimpots on the GRLV by the output terminals are for balancing out the output voltages.

haha it seeems like a little bit overkill... i agreed but the price¬†between 200VA/100VA is almost the same. same price more weightūü§£

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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

finished today my cfa2, was a trouble free build beside that i like small case (think is a tetris disorder i caught in my teenage years ;-). once again, these trafo covers look nice but the shiel

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12 hours ago, RudeWolf said:

If you overdo it, you'd need a softstart circuit. Otherwise you're torturing the ON/OFF switch with inrush currents.

Thx for the suggestion. Seems like I real need a softstart borad to built.

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10 hours ago, Pars said:

Did anyone ever do a run of CFA3 boards?

I just completed it last week by setting it to ZF and 100ma bias ( +-20V rail).

Still waiting the chassis and soft starter.

Sounds better than my dynalo\hi with my HD800 and K1000.

 

 

cfa.jpg

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finished today my cfa2, was a trouble free build beside that i like small case (think is a tetris disorder i caught in my teenage years ;-).

once again, these trafo covers look nice but the shielding effect is near zero, to get ride of a small hum i needed to add some grain oriented bands. heatsinkt of the case seems a bit overdesingned, gets only a bit warm. offset without servos was surprising low at around 10-15mv, could use nice matched mje15030/15031 from my previous dynahi project.

the amps sounds very nice, one of the few amps that are neural and speedy that i like, really a "wire with gain" type of desing. thanks a lot for the design kevin gilmore and all of you for the help from this forum :-).

cfa2_aa.jpg

cfa2_bb.jpg

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it's a BRZHIFI BZ2607  case from aliex..., size is  260*311*70mm.  i have to many silver boxes so i like compact sizes even if the layout isn't perfekt.

the trafo is a 100va /24volt from triad magnetic VPT24-4170 (mouser), with a bias of 200ma the amp needs only around 40va so a lot of reserve here, next time i would chose one that is a bit smaler.

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Here is an attempt to make a ‚Äúsmd raal uberamp driver‚ÄĚ. I followed Kevin‚Äôs schematic. The big resistor is for feedback/gain, I guess 1.5 ‚Äď 2 W is required¬†1999272768_raalpreubertop.thumb.JPG.7b1c6b4e692ab43984d6f06d3991992f.JPG

and a few components on ‚Äúsolder‚ÄĚ side.
1504106947_raalpreuberbottom.thumb.JPG.dbf28a051d427b28b927e0d6e4c29aa9.JPG

 The real challenge will be the power sections. 3A x * +/-24V * 8 * balanced - might be a bit extreme for headphone amplifier…

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