Fet-ishizator that Caiman dac

[leo]

I'm going to try this for the laugh ;) http://www.lampizator.eu/LAMPIZATOR/FETISHIZATOR/JFET_CDout.pdf
I reckon I could fit that on a board which will plug straight into the Caiman sockets

[HighFidelityGuy]

I didn't understand much of that pdf but I think the gist is that this is a solid state version of a valve buffered output. Is that correct?

If so, is this an alternative to the passive output mod?

[leo]

Hi Dave,

Its just something I wanted to try, its supposed to sound like a valve buffer and can be used as an alternative to the passive or stock Caimans active audioboard.

Just got in but I should have it knocked up tonight :)

[Ali Tait]

Nice one Leo,be interested n how it sounds.

[DSJR]

Probably a really daft question, but why do most CD player/DAC manufacturers use chip op-amps? Are they really better than a proper line buffer, or is it just for cost and size???

I only ask but when I had my CD player on bits and saw TWO op-amps per channel (on both phono and balanced output boards) I wondered why...

[HighFidelityGuy]

Hi Dave,

Its just something I wanted to try, its supposed to sound like a valve buffer and can be used as an alternative to the passive or stock Caimans active audioboard.

Just got in but I should have it knocked up tonight :)

Sounds interesting. I look forward hearing how you get on. :)

[leo]

PIA to squeeze that on this small piece of Matrix :mental:
I added sockets where possible to allow tuning if needed

Only had chance to try it quick, I had some clipping , The Wolfson dac has too high output so I need to play about with attenuation on the dacs output

I still need to add the cap multipliers on the supplies but will do that later , for now its ran from the output of the 7812 reg

http://i273.photobucket.com/albums/jj220/kingbusoms/DSCF7317.jpg

[Ali Tait]

Notice you've replaced the ribbon cable Leo,whyfor?

[leo]

Notice you've replaced the ribbon cable Leo,whyfor?

Being a constant fiddler the ribbon cable had occasional breaks so I replaced the lot with individual cable, easier to replace broken strands than ribbon.
The pair of coloured wires are solid copper cat5, the signal path ;) didn't have enough cat5 to do all signal ones

[Ali Tait]

Did you hear any difference from doing this?

[leo]

Did you hear any difference from doing this?

Very subtle, you have pure solid core copper cat5 against stranded tin stuff. I needed to replace the ribbon anyway so thought I may as well use the cat5 for the signal :)

[Ali Tait]

Hmm,might give it a go sometime.

[James G]

Leo, what will you call your new mod?

The Caiman FETish? :lolsign:

[HighFidelityGuy]

Hi Leo, did you make any more progress with this mod? Cheers.

[leo]

Hi Dave, I built Stans discrete stage on my last bit of vero so didn't get around to the Fet circuit , soon as I get more board I'll knock it up

[HighFidelityGuy]

Ok, thanks Leo. I'll be interested to know how it compares to Stan's new output design. :)