ACA PCB's

Jennifer G

Member
2015-08-31 2:31 pm
Is it possible to just get the PCB's? Or just the PCB's plus the semiconductors?

I see the parts kit is $149, but I assume that includes mounting hardware, speaker terminals, notebook power supplies, etc..

I'd really just like the PCB's or the PCB's plus the PCB only parts (transistors, caps, resistors etc..) Like the B1 Buffer board I got from Pass Labs.. that'd be great.. I bought the board from them along with the matched jfets. Then I got the rest of the parts from Digikey.

My idea is to use an Antek transformer with dual secondaries feeding both boards in the same case, using a non-regulated power supply board if possible.. like the chipamp snuberrized power supply board.

I already have a case, speaker terminals, heat sinks, rca jacks & mounting hardware. Just need the PCB's and a recommendation for PC supply board. And is it okay to have them both in the same case vs. monoblock? (i.e. will it impact the sound negatively.. .thinking the linear power supply should at least help).
 

Jennifer G

Member
2015-08-31 2:31 pm
Ha! I always suspected in addition to the greedy boyz there must be some greedy girlz lurking!!:D

Hah, how am I greedy? :) I just like the idea of a linear power supply and for them to be in a case that matches my recently built LM3886 :) I have an extra aluminum bar (for the faceplate) of the same dimensions as my LM3886 amp :)

If I was truly greedy I'd break out the perf board and solid core wire for the traces :)
 
Last edited:

needtubes

Member
2003-05-24 9:23 pm
Hah, how am I greedy? :)

Just a phrase that is tossed around in the Pass section to describe those of us who wait impatiently for Mr. Pass to release a new circuit for us to swoon over.

The PCBs are available from the DIYAudio Store here. You might also need to pick up some N-channel JFETs for the input (B grade is fine). The rest of the parts can be sourced from your favorite supplier.
 

Jennifer G

Member
2015-08-31 2:31 pm
Thanks needtubes and WBS!

I just ordered the Amp Camp PCB's! Good price! Gotta love the "Nelson Pass" print on them, like my Pass Labs B1 Buffer board :)

Jennifer sings "I think we all addicted" -- Chance the Rapper, Cocoa Butter Kisses. Seriously, these probably aren't going to be the last two amps I ever build lol.
 
Last edited:

Jennifer G

Member
2015-08-31 2:31 pm
Just a phrase that is tossed around in the Pass section to describe those of us who wait impatiently for Mr. Pass to release a new circuit for us to swoon over.

The PCBs are available from the DIYAudio Store here. You might also need to pick up some N-channel JFETs for the input (B grade is fine). The rest of the parts can be sourced from your favorite supplier.

Can I use an unregulated linear dc supply board? I'm guessing the laptop power bricks are regulated?
 

propitious

Member
Paid Member
2012-06-09 6:07 pm
Indiana
Jennifer: Yes you can have great results building a linear supply for the ACA. Look at my post 1301 in Amp Camp Amp - ACA. I hope the link works. The sound was even better than with the bricks, however I did overkill on my PS and you can get very good results using something like the Peter Daniels board or the PS board in the diyAudio Store, for less work and cost. The thing I want to point out was that the Antek transformers tend to, under load, have slightly less voltage, but more current than others. To get a full 19 VDC, I had to use a 100VA, 15 vac secondaries, parallel for each channel. However, if you have enough heatsink, you could use one Antek 100VA 18V secondaries, using one secondary for each amp. Several people have said it sounds even better with a higher voltage at 24 V, just adjust the pot P1 so that you have about 0.5 VDC above 50% of the rail voltage under load. There are posts about that. My heatsink was not able to dissipate any more heat, so I had to stay at 19V rail. I suggest you build the linear PS any way you can, and I think you will be very happy with the results.