Custom Regulators

[E64]

Can someone check and see if this is done right

 

[gman]

You are missing the 100uf capacitors on the input voltage. They say its required for the output voltage too but I usually dont. The voltage set resistor on the ptr08100 is between pins 5 and 3 actually. There is a nicely done custom reg diagram pic but it has the pins on the ptr08100 wrong! I would know because I was so confused today why the regulator was outputting 11v! I checked the datasheet and I was following a false diagram. Luckily I didnt kill it.

 

[E64]

Thanks I was making sure before I processed wiring up the caps and wires I didn't put uf caps on yet I wanted to make sure the resistors were on there right. Is it possible to power up the gc with 1 uf caps on each regulator like this?

 

[gman]

The datasheet says to use 100uf caps so I would use 100 uf.

 

[E64]

they're 100uf 25v each

 

[gman]

Looks good to me. Just need power and ground on all three of them.

 

[E64]

Alright thanks Gman

 

[E64]

OK I wired up the regulator to 2 different Gc 1 is a Rev C model and the other 1 is the standard one the Rev c powered one but the other 1 which is this picture of the board I had power going to but the thing is the cpu and gpu gets warm but not video or audio isn't coming out of it but on the Rev C board I had video coming from the board but the audio was distorted any suggestions what the problem might be?

 

[gman]

You should read the voltage values coming from the regulators and check to make sure they are operating correctly. I always do this first before hooking them up to the board so I know I wont accidentally kill the board if they aren't functional. Also it goes without saying everytime you trim a board, to sand a ton on the edges so nothing is shorting.

 

[Fluxedo]

You need a second 100uf cap on the 1.9/1.7v output.

 

[Prog]

They say its required for the output voltage too but I usually dont.

This *could* cause problems because of all the noise introduced by switching regs, which can interfere with the high-frequency signals between chips.

 

[gman]

They say its required for the output voltage too but I usually dont.

This *could* cause problems because of all the noise introduced by switching regs, which can interfere with the high-frequency signals between chips.

Yeah you're probably right. They are there for a reason, smooths out the output voltage to a more constant voltage. But it'll work without them so I doubt that's causing any of the issues he's having.