[f] AMB on Facebook

SIGMA 11 BUILD LOG

sigma11, sigma22

SIGMA 11 BUILD LOG

Postby Energy » October 3rd, 2019, 2:19 pm

I was thinking about using an HDPLEX 200W LPSU to power my music server. Unfortunately it has output noise of 3mV/3000μV and so I wanted something quieter.

The idea i came up with was to build multiple Sigma 11's and connect their outputs in parallel for higher current handling.

Three o11's to the left, Three o11's to the right, each with their MOSFETs mounted to the side fins of the DISSIPANTE 2U case.
Between them would have three transformers.

Image
Last edited by Energy on October 3rd, 2019, 2:25 pm, edited 1 time in total.
Computer (Ethernet) Intel NUC7i7DNHE (USB) SOtM tX-USBultra (USB) Denafrips Terminator (XLR) AMB Laboratories β22 (Balanced) Focal Utopia

= ︿ =
User avatar
Energy
 
Posts: 86
Likes: 3 posts
Liked in: 4 posts
Joined: September 30th, 2012, 4:07 pm
Location: San Francisco, CA
Country: United States (us)

Re: SIGMA 11 BUILD LOG

Postby amb » October 3rd, 2019, 2:24 pm

You cannot connect multiple σ11s in parallel to supply more current. They will “fight” each other and become damaged.
User avatar
amb
Site Admin
 
Posts: 10378
Likes: 175 posts
Liked in: 482 posts
Joined: March 29th, 2010, 9:49 pm
Location: Sunnyvale, CA
Country: United States (us)

Re: SIGMA 11 BUILD LOG

Postby Energy » October 3rd, 2019, 2:26 pm

Darn I read somewhere that some power supplies could be connected in parallel. Is there an exception to that rule or something?
Computer (Ethernet) Intel NUC7i7DNHE (USB) SOtM tX-USBultra (USB) Denafrips Terminator (XLR) AMB Laboratories β22 (Balanced) Focal Utopia

= ︿ =
User avatar
Energy
 
Posts: 86
Likes: 3 posts
Liked in: 4 posts
Joined: September 30th, 2012, 4:07 pm
Location: San Francisco, CA
Country: United States (us)

Re: SIGMA 11 BUILD LOG

Postby amb » October 3rd, 2019, 3:36 pm

Some power supplies have high output impedance, which could absorb the small output voltage differences among them when paralleled. But such output impedance is detrimental to load regulation.

σ11/22 has ultra low output impedance, with excellent load regulation. But one output will look like a dead short to another.
User avatar
amb
Site Admin
 
Posts: 10378
Likes: 175 posts
Liked in: 482 posts
Joined: March 29th, 2010, 9:49 pm
Location: Sunnyvale, CA
Country: United States (us)


Return to σ11 and σ22 regulated power supplies

Who is online

Users browsing this forum: No registered users and 0 guests

Quick Links

AMB audio DIY resources
AMB audio shop