Not exactly a Group Buy: bare boards for RACAM (Round ACA Monoblock)

[Mark Johnson]

Those photos are duplicates of the originals in (this message) , posted two months ago.

 

[silver89]

I got my boards and they are beautiful!! Will take some time to get the parts together but planning to have my two daughters each build a pair along with me. Hoping to share some pics once done. Thanks Mark Johnson for the boards and all you do for us DIYers

 

[Audiobear]

The boards Mark Johnson ordered for me came in last week as parts for the build also continued to arrive. The last few parts arrived today so finally the RACAMs are finished. They're up and running in a spare bedroom I use as an electronics shop. They sound great after an hour. They still need some time to heat up and for the voltage to stabilize.

 

[Audiobear]

 

[jimk04]

I've set the voltage over Q1 to 12v for my 24v PSU. Over Q2 I have 10.6 something. Is this ok?
DC offset on the outputs is about 4mv so very good there.

 

[Mark Johnson]

Another ten RACAM boards ordered today, which means another six or eight extra boards added to the global distribution system.

UK
France
Italy
Alabama
California
Colorado
Kansas
Maryland
New York
North Carolina
Washington

 

[silver89]

Here are some pics of my daughters and their finished product. Each made one channel and the set was gifted to their grandfather. Great project and and beautiful sound. The kids loved it and want to build another. Thank you Brock and Mark for making this happen.

 

[jimk04]

Mine playing beautifully. Need to sort out the gain structure of my system as it's a little quiet but I have some wiggle room there.

 

[jimk04]

Beautiful pictures silver, sorry I didn't see them before my post. This hobby is brilliant and to share it with young ones.....perfect.

 

[Mark Johnson]

Here are some pics of my daughters and their finished product. Each made one channel and the set was gifted to their grandfather. Great project and and beautiful sound. The kids loved it and want to build another.

Those photos are adorable! On top of the cuteness, they actually did an excellent job of soldering & flux removal too. Dad is a great teacher. Congratulations!

 

[ClaudeG]

Great little girls, and so nice sharing that fun together!

Well done!

Claude

 

[silver89]

Great little girls, and so nice sharing that fun together!

Well done!

Claude

Thanks for the positive comments and thumbs up everyone. It really was great family time and a valuable learning and growth project for the kids. Highly recommended!!!

 

[derekr]

I posted a zipped Excel spreadsheet on the ACA Redux thread that lists the Digikey part numbers for Mark's RACAM implementation of the ACA. I attach it below for convenience. As mentioned in the ACA Redux thread, I am not responsible for any errors, inaccuracies etc. Use at your own risk.

Thanks to Nelson Pass, Nelson Brock and Mark Johnson for continuing to enhance our lives with their generous contributions.

 

[Mark Johnson]

Thank you, Derek!! I'm sure DIYers are very glad to have this information, in such an organized and easy-to-use format.

 

[carsten.witt]

WOW!

 

[nicoch58]

 

[jimk04]

Unreal!

 

[derekr]

Have they sold, Carsten?

 

[Mark Johnson]

Here is the ebay link , it probably tells you how many bids have been received, what is the end date, etc.

 

[derekr]

Got some b**ls, I must say. He’s also not lined up the ‘flats’ on the heatsinks with the flats on the PCBs. Shame, after all that effort you went to, Mark 🙃