I'm not sure where I'm at in the forums, but I think I'm under the ACA 1.8 heading and so I thought I'd post a little blurb about how much I love my little 1.8 amps that I built and post a link to my write up of them that I posted on the San Francisco Audiophile Society page. And, BTW, thanks to everyone who contributed herein some bit of knowledge that I was able to make use of while working on my amps. Here's the SFAS link
Still waiting for heatsinks and some components. Very excited 🍻
Remember, Nelson Brock's printed circuit boards are the ones with a single LED (not three) and zero inductors (not two).
Thankyou. Looking for suitable components and one TE part came up with fixed leg pitch. This helps a lot
Those are beautiful!!!
J112 , 2N4401 are far more easily-sourced devices
Replacing one LED with two LEDs will be very pretty . . . . post #89 shows the part numbers and glow colors I happened to like, but of course it is 100% personal preference and others may love different parts.
Fantastic job reducing the "included angle" between the Loudspeaker+ and Loudspeaker- binding posts.
Member 6L6 plans to study the effect of low cost, low performance, eBay commodity wall wart bricks when applied to the LCLC filter of RACAM, versus ultra quiet linear power supplies. Maybe cheaper is just as good? Or not?
J112 , 2N4401 are far more easily-sourced devices
Replacing one LED with two LEDs will be very pretty . . . . post #89 shows the part numbers and glow colors I happened to like, but of course it is 100% personal preference and others may love different parts.
Fantastic job reducing the "included angle" between the Loudspeaker+ and Loudspeaker- binding posts.
Member 6L6 plans to study the effect of low cost, low performance, eBay commodity wall wart bricks when applied to the LCLC filter of RACAM, versus ultra quiet linear power supplies. Maybe cheaper is just as good? Or not?
So now that this ACA is transformed into mono blocks what is the preferred power supply? Does anyone have suggestions, a part numer or source for said power supplies? Thanks.
The DC power jack will accept the same 24V brick style supply that is sold with the ACA kit, and is also available separately. Dual mono blocks and dual power supplies will sound great.
OK. That makes sense. But that would be overkill. Wouldn't separate supplies that sourced appropriate I.e. less) current be more cost effective than the supply intended for the stereo amp??
Practically speaking, it is simply easier to go with the standard supplies. They are not expensive.
DIY is all about overkill. 😉
DIY is all about overkill. 😉
If you would like a challenge, consider some minor modifications to increase the bias current of the ACA output stage to, say 1.6 or even 1,8 Amps. That will make better use of the SMPS current capacity. The heatsinks will get warmer as well, so approach with caution.
Member 6L6 and I have experimented with bottom-of-the-barrel, cheapest-in-the-world, eBay sourced power supplies for the round ACA with onboard SMPS filter using a fourth order LCLC topology (called "RACAM"). On the theory that perhaps it may not matter how good or how terrible the SMPS might be, the subsequent filter may wash away all sins anyway.
My preliminary finding is: the ($49 SMPS ) sold in the diyAudio Store, gives slightly better results than the random $12 SMPS I bought from ebay.
My preliminary finding is: the ($49 SMPS ) sold in the diyAudio Store, gives slightly better results than the random $12 SMPS I bought from ebay.