I bought my boards and "kit" from a forum member. I was just checking to see if they had the spot for them. Mine are the original boards without it.
Check this recent post with photos.
http://www.diyaudio.com/forums/pass-labs/215392-amp-camp-amp-aca-215.html#post4321827
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Yup, the current boards have R15
Photos aren't reality.Those are prob the original ones in the photo
Photos aren't reality.Those are prob the original ones in the photo
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I have a question about C1. The original 3300 uF cap in Nelson's BOM is not available at Mouser or Digikey. Can anyone recommend a suitable replacement?
For reference, here is the cap from the BOM:
ECO-S1HA332BA Panasonic | Mouser
ECO-S1VA332BA Panasonic Electronic Components | P6596-ND | DigiKey
I have no experience with Rubycon or Cornell-Dubilier, are they any good? If so, would this work?
381LX332M035H012 Cornell Dubilier - CDE | Mouser
In trying to match the specs, how important are the ESR and/or ripple current? Is it better to go higher or lower with those?
For reference, here is the cap from the BOM:
ECO-S1HA332BA Panasonic | Mouser
ECO-S1VA332BA Panasonic Electronic Components | P6596-ND | DigiKey
I have no experience with Rubycon or Cornell-Dubilier, are they any good? If so, would this work?
381LX332M035H012 Cornell Dubilier - CDE | Mouser
In trying to match the specs, how important are the ESR and/or ripple current? Is it better to go higher or lower with those?
Normally for ripple current the bigger the better, on the contrary, for ESR the smaller the better.
Panasonic FC 3300uf/35V is also a good alternative
Agree with Variac...2.1A barely sufficient for 2 channels
For ACA:
-With R15, i.e. 2.2K, one channel will drain around 1.6A from PS;
-No R15, one channel will drain around 1A from PS. 2.1A seems enough to drive 2 channels, but I won't push PS so hard - think heat, long-term stability
For ACA:
-With R15, i.e. 2.2K, one channel will drain around 1.6A from PS;
-No R15, one channel will drain around 1A from PS. 2.1A seems enough to drive 2 channels, but I won't push PS so hard - think heat, long-term stability
I have ACA on from 3 years , and ... am I the only one ... I prefer it without R15 2,2 k ... 🙂
hi there...
someone ever tried that design except from dragonweed, the OP?
what do you think are the advantages?
is there a better proven design with similar topology?
I've buit the ACA amp amp but wnated to try something a bit different to play with, with respect to the essence of the design.
http://www.diyaudio.com/forums/pass-labs/232360-amp-camp-amp-mod.html
someone ever tried that design except from dragonweed, the OP?
what do you think are the advantages?
is there a better proven design with similar topology?
I've buit the ACA amp amp but wnated to try something a bit different to play with, with respect to the essence of the design.
http://www.diyaudio.com/forums/pass-labs/232360-amp-camp-amp-mod.html
The F-5 is just about as easy to make, but needs a real linear power supply. Will sound different which makes it worth trying. Will be educational to make the power supply. Boards for both are in the store.
The Store is also just getting another batch of matched JFETS which will work with the F-5 Check out the F-5 Build guide also.
Mark
The Store is also just getting another batch of matched JFETS which will work with the F-5 Check out the F-5 Build guide also.
Mark
hi variac,
I already made the f5 in the past...
I wanted to try something new and generally speaking, i find SE designs sound signature better than push pull...
i also don't need really more than 10W max for my efficient speakers
Supposedely someone named «Wensan» has drawn some nice schematics (has mentioned By Nelson in my link above).....however his work semmes to have disappear from the net.
Anyway...i will probably go ahead for a quick point to point build and see.
thanks for your reply!
I already made the f5 in the past...
I wanted to try something new and generally speaking, i find SE designs sound signature better than push pull...
i also don't need really more than 10W max for my efficient speakers
Supposedely someone named «Wensan» has drawn some nice schematics (has mentioned By Nelson in my link above).....however his work semmes to have disappear from the net.
Anyway...i will probably go ahead for a quick point to point build and see.
thanks for your reply!
Ok, I thought you were just about to start making amps on your own! And I thought the F-5 would be easy and sound a lot different.
Consider the Amp Camp Amps. They have the option of either SE or Complementary with the same BA-3 front end. Just order the correct boards!
Consider the Amp Camp Amps. They have the option of either SE or Complementary with the same BA-3 front end. Just order the correct boards!
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Is measured harmonic distortion not useful? According to planet10 it means nothing. Really?
http://www.diyaudio.com/forums/full-range/276418-noob-noob-ideas-4.html#post4373525
http://www.diyaudio.com/forums/full-range/276418-noob-noob-ideas-4.html#post4373525
the spectrum is not presented....
but for advanced user who knows exactly how th topology works and what the spectrum of distorsion looks like, it may be useful.
i think the distorsion is mostly 2nd harmonic in this case...
I have the ACA for two month, and since it gets very hot in the summer (with my enclosure) I disconnected the 2,2k resistor (temporarily, I thought) but surprisingly I like the sound better without it.
Even more organic for my ears...