Aluminum-core PCB cost?

Lasse Langwadt Christensen wrote:

> some time ago I saw this 20oz board on reddit:
> https://usercontent.irccloud-cdn.com/file/gHochdce/irccloudcapture-1320676838.jpg

:-O

> the guy said it cost $2250

:-OOO

Why didn't he just use a meter of a bare electric wire
or, if really wanted to be fancy, the flat winding wire like this?

https://4.allegroimg.com/original/01eba1/1a044c464662aabcd908294a25a4

The biggest one can handle 180 amps and can be soldered to a regular PCB 
where needed. BTDT, but with the 30A-rated variant.

	Best regards, Piotr

Lasse Langwadt Christensen wrote:

> I don't know if fr4 bonded to alu is really that much much better a
> than regular pcb bolted to an alu plate

1.45mm of missing FR4 better.

	Best regards, Piotr

torsdag den 26. april 2018 kl. 17.05.15 UTC+2 skrev Piotr Wyderski:
> Lasse Langwadt Christensen wrote:
> 
> > I don't know if fr4 bonded to alu is really that much much better a
> > than regular pcb bolted to an alu plate
> 
> 1.45mm of missing FR4 better.
> 

but you can have vias and multiple layers

Lasse Langwadt Christensen wrote:

> but you can have vias and multiple layers

Vias are conductive, so you need at least blind vias (expensive)
or burried vias (even more expensive) and a multi-layer board
(expensive again). The single-layer ALU is cheap and works like
charm. HV circuits are easy with that substrate, while the question
about how exactly you want to connect that mains-powered
conductive sandwitch to a grounded radiator plate might get
interesting.

	Best regards, Piotr