I want to be able to mount the heatsinks tight to the board without have to worry about short circuit.Samuel Groner said:What's the reasoning behind removing the ground (?) plane below HS3 and HS4? Are R1-R4 series resistors for the snubber caps?
Samuel
Excactly. It's more practical to not have to isolate the diodes.Harpo said:Don't you want an isolation kit for mounting these MUR3020WTs (same as MUR3020PT pin 4) on heatsink because of common cathode?
peranders said:I have made a rectifier bridge for people that think plain ones won't do.
peranders said:The pcb is a 4-layer board
http://www.groupdiy.com/index.php?topic=33963.msg415234#msg415234jdbakker said:I know this isn't your first design by a long stretch, and that there must be a technical reason to go with a multilayer PCB.
I wanted to remove copper under two heatsinks because I wanted a simple mounting with any insulation AND I wanted much copper for carrying 30A. I'm aware of that you hardly will get 30 A for longer periods in most amps but at least it's hard to destroy the pcb. Besides, I felt for it.jdbakker said:peranders said:The pcb is a 4-layer board
...why?
I know this isn't your first design by a long stretch, and that there must be a technical reason to go with a multilayer PCB. It's just that for the life of me I can't figure out what it is.
JDB.
... and you never will. Discussing with audiophiles is like discussing religion or politics. It's a discussion you can't win.audiox said:http://www.groupdiy.com/index.php?topic=33963.msg415234#msg415234
Wikipedia:
High-end audio can refer simply to the price, to the build quality of the components, or to the subjective or objective quality of sound reproduction.
But I still don't understand...
peranders said:... and you never will.
peranders said:jdbakker said:peranders said:The pcb is a 4-layer board
...why?
I wanted to remove copper under two heatsinks because I wanted a simple mounting with any insulation AND I wanted much copper for carrying 30A. I'm aware of that you hardly will get 30 A for longer periods in most amps but at least it's hard to destroy the pcb.
peranders said:Besides, I felt for it.
audiox said:Isn't that little masochistic to introduce your hifi/high-end products in a pro audio forum like this? It is 100 percent sure that you face criticism if you don't have arguments based on science. There are huge amount of forums where immediate reaction would be "Gold plated 4-layer board, wow! That must be good!"
peranders said:I'm aware what happens with high currents and multilayer. A while back I did a 300 A (continuously) design
audiox said:peranders said:I'm aware what happens with high currents and multilayer. A while back I did a 300 A (continuously) design
In multilayer boards you can't use the inner layers for currents larger than maybe hundred milliamps (or even less if reliability is important).
That is because the only connection between the inner layer and outer layer (or component) is the joint of inner layer copper and hole plating. And that is very very thin. The currents you are talking about will vaporise it in fraction of a second.
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