ACA Mini "Almost Clone" Board

[A Jedi]

@KevinHeem you're a legend.

 

[Signal lost]

Thank you Kevin

 

[beeah]

So stoked - I have this and an Aleph J (my first Pass amps) in the active pipeline, and it looks like I may have one singing by the end of the weekend!

Thanks again, Kevin, for all your (and your kids’) efforts!

 

[KevinHeem]

Is everyone comfortable with the bias procedure? If not I could do a quick video. It’s really quite easy though.

 

[barryso]

Is everyone comfortable with the bias procedure? If not I could do a quick video. It’s really quite easy though.

First, thanks again for doing all the legwork. There's about to be a flurry of amp building going on and you're responsible for it. !!!

I've not read the biasing instructions carefully yet ... that'll happen as the amp is built. But that sort of video, if it really doesn't take too much time to make, would likely be useful to a lot of folks going forward. There will likely be hundreds of these built in the next year or so and many will be newbies.

 

[DS27]

Is everyone comfortable with the bias procedure? If not I could do a quick video. It’s really quite easy though.

I am actually glad you brought that up! I have never done it and this Amp will be my second ever build, so I wouldn't mine a video guide on it.

Thanks in advance
Daniel

 

[KevinHeem]

You got it!

 

[audiosteve]

They arrived today!!! Thank you, Kevin! Maybe I can get something built this weekend!

 

[pfdavid]

Got my boards and mosfets yesterday! Very excited to build this well received amplifier.
Kevin, your service to our community is noble. My deepest thanks. - David

 

[ItsAllInMyHead]

Sometimes I feel more like the sheep dog.

Hopefully a bit like Sam...

 

[KevinHeem]

Here is the video showing the bias procedure. Not the best resolution, but should be good enough to help you through the process.

ACA MINI BIAS PRODEDURE VIDEO

 

[Mark Johnson]

Great video Kevin, congratulations!

Nervous builders may want to insulate the metal shaft of their screwdriver with blue painter's tape, all but the last 1 cm of the blade, so that any accidental touches between the screwdriver and the circuit, don't create a short. Or use an all-plastic screwdriver. Or perhaps a Bourns H-90 (sales link) purpose-made adjustment tool -- AFTER removing the metal clip that holds it in your shirt pocket.

None of this is strictly necessary, as Kevin's video proves conclusively. But if you want a little bit more peace of mind, why not?


_

 

[von Ah]

Excellent video, Kevin. That is very helpful to see the process in action.

The third hand was a nice trick at about 10:30.

 

[DS27]

Here is the video showing the bias procedure. Not the best resolution, but should be good enough to help you through the process.

ACA MINI BIAS PRODEDURE VIDEO

Great!! I just got my package from you from USPS about 10 minutes.
Thanks Kevin
Daniel

 

[barryso]

Hi Kevin,

Board and parts have landed!

Thanks for the video, too.

Barry

 

[A Jedi]

Just got a package

Thank you @KevinHeem and kids, @Mark Johnson and, @Nelson Pass.

 

[KevinHeem]

I’m, at the very least, as excited as you guys are…looking forward to build updates and reviews!

However, it’s not a race…take your time and enjoy the process.

 

[KevinHeem]

The third hand was a nice trick at about 10:30.

About 30 minutes before shooting the video I taught my son how to bias the amp. This gave me a better idea on how I wanted to present in the video. This also gave Perry an understanding of how the process worked, which shows in his camera work.

 

[KevinHeem]

For test points 1,2 and 3 I installed Keystone 5006 to clip on mini-graber test leads. The 5006 don’t fit unless you clip one lead. That said, a scrap resistor lead bent in the shape of a hook works just as well.

 

[kartk]

Received PCB and parts, thanks @KevinHeem for arranging this.