Mezmerize DCB1 Building Thread

[Tea-Bag]

Originally Posted by Marinos

Happy new year with health, good job and enjoyment to everybody.

I need your lights about C8. Can I use 120uf (which I have on hand) instead of 100 ?
I understand that R24/C8 form the start up time delay and for this I'm nearly sure that 120uf is not a problem. I'm not sure how such a change affects "power off".

No worries. Keep in mind, a 100uf is normally +/- 20% value anyways.

[Marinos]

Since photos are never useless in a construction thread let me show you how I implemented the C1/C3 mod.

I left the the pcb holes unused (photo). I left the leads of the 1st and last led leads uncut. I wedged in between these leads the plastic capacitor leads and soldered.

Capacitors are 0,33 uF 250V NOS Siemens MKP.

[Salas]

NOS Siemens are good capacitors. Is that the store's PCB, or older?

[Marinos]

It's store's. Purchased on December I think ..

[Salas]

Looks good. You had some OPA627 pre if I recall correctly? Not needing gain anymore, or the buffer goes to another system?

[Marinos]

You remember always well !!!!!!

The 627 was a buffered 10K ALPS with a touch of gain on both IC's (x 1,5 I think) . Recently disassembled to take ALPS for Mezmerize (photo).

I was playing it with 2 12V 7Ah batteries. That was were our roads crossed ... I replaced batteries with your shunts with sparkling results. Aaaaa I recently saw your reference to my impressions in the MPP thread. The thread is too long and dense... Did they agree with my impressions ?

[Salas]

Yes, that one pre-amp.

[Marinos]

I have finished staffing and I have a question before starting tests.
I will reuse an existing psu off board. On board bridge will be omitted but I would like to use the existing pads for local decoupling. What's the minimum capacitance you would advice me to use ?

[Salas]

100uF

[Marinos]

Thanks