best place for output voltage

maxpou · 14th June 2009, 03:31 AM

Hi guys,
i would like to know where is the best place for output voltage in my PS layout, closer to my diode bridge? thank you! Maxpou

Mr Evil · 14th June 2009, 03:58 AM

It's fine where it is. If you move it closer to the bridge, then the high, spiky charging currents will be flowing past the output, leading to spikes on the output voltage.

maxpou · 14th June 2009, 01:41 PM

Hi Mr Evil,
thank you for reply and the explanations. Maxpou

Eric Juaneda · 17th June 2009, 07:32 PM

Hi maxpou,

Quote:

Originally posted by maxpou
I would like to know where is the best place for output voltage in my PS layout...

What kind of material is it? Amplifier?

Eric

star882 · 17th June 2009, 11:48 PM

One thing about the layout is that the traces could be wider to reduce resistances.

Remember: It does not cost any extra to widen traces on PCBs. On the contrary, removing copper uses up the solvent used to dissolve it. When working with low frequency power circuits (where stray capacitance is unimportant), a good way to think of this is to start with a layout of all copper, then remove strips just wide enough to ensure enough clearance between nodes. Which is really what you're doing when making a PCB.

maxpou · 23rd June 2009, 09:33 PM

Quote:

Originally posted by Eric Juaneda
Hi maxpou,

What kind of material is it? Amplifier?

Eric

Salut Éric,
no it's for my shunt reg for my line stage. Why? Maxpou

maxpou · 23rd June 2009, 09:41 PM

Quote:

Originally posted by star882
One thing about the layout is that the traces could be wider to reduce resistances.

Remember: It does not cost any extra to widen traces on PCBs. On the contrary, removing copper uses up the solvent used to dissolve it. When working with low frequency power circuits (where stray capacitance is unimportant), a good way to think of this is to start with a layout of all copper, then remove strips just wide enough to ensure enough clearance between nodes. Which is really what you're doing when making a PCB.

Hi Star882,
i post my PCB with bigger trace, but i don't how to start with a layout of all copper and remove strips. i use eagle as software. Maybe you can explain to me. Thank you! Maxpou

Mr Evil · 23rd June 2009, 09:53 PM

For the same reason that it's good to take the output voltage from where you have it now, it is also a good idea to make a star ground point at the same end, between the two voltage outputs. All ground connections should be made there, except the transformer centre tap connections, which should be kept at the other end, near the bridge where you have "GND" written already.

star882 · 23rd June 2009, 10:31 PM

Quote:

Originally posted by maxpou

Hi Star882,
i post my PCB with bigger trace, but i don't how to start with a layout of all copper and remove strips. i use eagle as software. Maybe you can explain to me. Thank you! Maxpou

That's good. The idea is that since you already paid for the copper, you might as well use it to reduce stray resistance.

maxpou · 12th July 2009, 02:32 PM

Hi Guys,
somebody can tell me how can i start my PCB with all cooper and remove strips just wide enough to ensure enough clearance between nodes? I use eagle cad. Thank you! Maxpou

14th June 2009, 03:58 AM	#2
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	It's fine where it is. If you move it closer to the bridge, then the high, spiky charging currents will be flowing past the output, leading to spikes on the output voltage. __________________ https://mrevil.asvachin.eu/

17th June 2009, 11:48 PM	#5
star882 diyAudio Member Join Date: Mar 2007	One thing about the layout is that the traces could be wider to reduce resistances. Remember: It does not cost any extra to widen traces on PCBs. On the contrary, removing copper uses up the solvent used to dissolve it. When working with low frequency power circuits (where stray capacitance is unimportant), a good way to think of this is to start with a layout of all copper, then remove strips just wide enough to ensure enough clearance between nodes. Which is really what you're doing when making a PCB. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

23rd June 2009, 09:53 PM	#8
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	For the same reason that it's good to take the output voltage from where you have it now, it is also a good idea to make a star ground point at the same end, between the two voltage outputs. All ground connections should be made there, except the transformer centre tap connections, which should be kept at the other end, near the bridge where you have "GND" written already. __________________ https://mrevil.asvachin.eu/

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14th June 2009, 01:41 PM	#3
maxpou diyAudio Member Join Date: Apr 2006 Location: Québec	Hi Mr Evil, thank you for reply and the explanations. Maxpou

12th July 2009, 02:32 PM	#10
maxpou diyAudio Member Join Date: Apr 2006 Location: Québec	Hi Guys, somebody can tell me how can i start my PCB with all cooper and remove strips just wide enough to ensure enough clearance between nodes? I use eagle cad. Thank you! Maxpou

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