Salas hotrodded blue DCB1 build

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syklab

Member
Joined 2009
Hi Salas,
Does the made/brand of PS cap make much difference in the hotrodded blue DCB1 design ? Doesn't the shunt reg shielded the buffer from ESR and ripples? I am think how expensive Caps like MUNDORF M-Lytic AG vs reasonable cap like Pana or CDE will make much different here? Any comment?

Thanks
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
In my experiments the CCS damped down the discretion between capacitors quality significantly than perceivable in raw supplies. Their impedance can still interfere to an extent though. Enough members maintain they can still subjectively pick several capacitor models out in their DCB1 builds. I would certainly advise a renowned good LowESR industrial capacitor like Panasonic or Nichicon for all the known reasons as a minimum.
 
Siberia

Siberia

Member
Joined 2011
Paid Member
Cd to receiver to Speakers. Crappy receiver, but I think it showed the same character of total lack of slam. I don't remember doing any rewiring, except changing a pair of rcas on the buffer, which seems to me, was wired in a same way as before:)

I've checked phasing with HI Fi news test LP. Sounds allright. It's uber weird that both speakers are showing same impotence.
 
Siberia

Siberia

Member
Joined 2011
Paid Member
Swapped in all possible combinations... Neither of them brought out the slam. Speakers are tri wirable, so I've tried using just the bottom end to see if it's alive at all. Let's say it's working, but the sound is very veiled, not rythmic at all on a track it should be. But again I'm not an expert of listening just to bottom end.

Next step opening cabinets? Can't believe this. So one more question. Do all 4 female sockets on buffer have to be joined through grounding via one wire? Or just left and right of input and output separately as I have now.
 
P

Porfido

Member
Joined 2008
LET THERE BE LIGHT!:xmastree:
dsc_0213.jpg

Done! Thank you so much, guys! :)


Can I ask you something? But, please, forgive my english...
I will get to stage 2 hotrodding (600mA), but I really can't understand the principle of this, because I'm electronic newbie...
Let me explain: if the jfets will anyway absorb the same amount of mA, what changes giving more current to the psu?
What gives the result of more sound quality in this, giving to the PSU current that fets anyway don't need?
Could you please explain?
Thank you very very much!
Regards!
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
The PSU Mosfets work on ranges that they conduct more and the PSU becomes lower impedance, everything works in heavy current mode around it. The filter capacitors, the Tx, the diodes. The signal does not sake them the least at such humongous power difference. DCB1 is a huge symmetric shunt power supply with a DC coupled tiny buffer at its end in essence. Brute force approach. Like those NASCAR things. Add your favorite Rock n' Roll soundtrack.
 
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Porfido

Member
Joined 2008
Salas said:
The PSU Mosfets work on ranges that they conduct more and the PSU becomes lower impedance, everything works in heavy current mode around it. The filter capacitors, the Tx, the diodes. The signal does not sake them the least at such humongous power difference. DCB1 is a huge symmetric shunt power supply with a DC coupled tiny buffer at its end in essence. Brute force approach. Like those NASCAR things. Add your favorite Rock n' Roll soundtrack.
Click to expand...

Thank you very much, Salas!:)
Now I'm even more tempted by Stage 3....
An externally hosted image should be here but it was not working when we last tested it.

:redhot::D
 
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