Building a symmetrical psu B1 buffer

[Salas]

Sugden & Regiregi, well done. Cheers.

Regi, what massimo said about pd.

[regiregi22]

Then I think I will have to re-check resistors wattage of some other circuits I have designed

[Salas]

Yes if you want them to show a long life without servicing needs. Same with semiconductors. Haven't you noticed how Papa over specifies power Mosfets in Class A amps? There they dissipate constantly enough like DC warmed up resistors.

P.S. Tell us more about your system configuration and what you replaced with DCB1, and the sonic footprint. Maybe even a picture if you may.

[woodturner-fran]

Salas,

I don't know if I have MKP, but I would have a good selection of nice PP film caps to try - is it worthwhile doing this, or is it only worthwhile with the MKP only?

Fran

[Salas]

Worthwhile with any film cap. Just try it and tell me your opinion.

[woodturner-fran]

And is it the bigger the better (i.e. bigger uF)?

Fran

[Salas]

Yes, a bit better for some filtration. If you find it worthwhile you can find your best type and value. We are not doing engineering now, we try to subjectively evaluate some little chemical cap distortion VS some little more noise on the Vref. Just do your most handy.

[paul.42]

can we run psu boards before the hypnotize boards or not.

[Salas]

No.

[regiregi22]

Well, I'm not very well at listening, but I have noticed more punch and more defined bass tones. Especially in drums or in the slap of an upright bass. I haven't give it a serious listening yet, only while doing other things.

It is connected to a gainclone LM3886 with a regulated PSU. It's been made from carlosfm's schematics, both amp and PSU.
My source are not the best, mainly mp3 and cds, played on the PC through a modded EMU 0404USB, wich has been changed to better electrolytics caps. I still have to change the output opamps to better ones.

This is my DCB1. I dont plan to make it look better or painting it, my mainly end is trying to get best sound. I finished that DIY stepped attenuator last week, it's 20k. I found a bargain at ebay, a 24 steps double rotary switch for 10$ shippment included, so I had to bought the Dales from mouser. It is internal wired with single core cat5e wires. It has placed underneath an output cap for the delay-start regulator. Pannasonic FM and Nichicon Audio KW capacitors, Dale and Takeman resistors. An all-steel chassis construction.

It sounds excepcionaly clean, putting my ear near the cone at max vol I cannot hear even a slight hum from it. It was substituting nothing, I was controlling the volume with the pot of the emu0404. I plan to bypass it with a wire, it doesnt seem to be good enought for the task.