seeking comment on first pcb design

ultrachrome · 16th March 2005, 03:05 AM

This is two capacitance multiplier power supplies on the same board with a star ground point in between. This is between the rectifier and amp boards for ESP P36.

So I used .150" traces where I could. Sorry I don't have the part names but the caps are 4700uF, 1000uF, and 470uF all 63V. The transistors are TIP2955 and BD139.

The transformer will initially be a 400VA 25+25 later replaced by two 30+30 transformers if I like the amp.

Thanks

Greg Erskine · 16th March 2005, 04:42 AM

hi ultrachrome,

I thought DoZ requires a 0-40v DC supply, 30-0-30 will be too big.

ultrachrome · 16th March 2005, 04:48 AM

I have traced one capacitance multiplier for each channel. A 30+30 transformer yields 38VDC according to Rod's construction article. I'm going to use a 25+25 tranformer because it's what I have on hand so I estimate I will end up in the lower 30s.

jleaman · 16th March 2005, 04:52 AM

What pcb / schematic software are you useing ?

Is this a regulator circuit ?

ultrachrome · 16th March 2005, 04:57 AM

The first image I posted is a screen scrape of expresspcb. I drew the schematic I just posted in ms powerpoint.

jleaman · 16th March 2005, 06:10 AM

Is this a regulator circuit ?

For any reason..

Id change the layout so that input is at one end and out put is at the other. Not them both at each end...

Do yoU need help i could help you..

J

ultrachrome · 16th March 2005, 06:28 AM

I drew one side and saw that I could fit another supply on the board by rotating it 180 degrees. This seemed like a good solution because this board would fit with its long side near the back panel of the enclosure, with the transformer.

This allowed each channel the shortest power wiring possible.

I'll post a pic of the enclosure tomorrow.

I rarely turn down help.

Thanks.

jleaman · 16th March 2005, 06:30 AM

Like this. : O )

Could you tell me the voltage in and out that yuo are trying to achieve ? I also have a better regulated schematic you could use instead of this one.

Jason

jleaman · 16th March 2005, 06:33 AM

Or this one.

Greg Erskine · 16th March 2005, 08:10 AM

Quote:

Originally posted by grege
I thought DoZ requires a 0-40v DC supply, 30-0-30 will be too big.

Quote:

Originally posted by ultrachrome
A 30+30 transformer yields 38VDC according to Rod's construction article.

Sorry, I stand corrected, I should have read it more carefully. Rod knows his stuff.

16th March 2005, 04:42 AM	#2
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	hi ultrachrome, I thought DoZ requires a 0-40v DC supply, 30-0-30 will be too big. __________________ Greg Erskine

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16th March 2005, 04:48 AM	#3
ultrachrome diyAudio Member Join Date: Jan 2002 Location: Puget Sound	I have traced one capacitance multiplier for each channel. A 30+30 transformer yields 38VDC according to Rod's construction article. I'm going to use a 25+25 tranformer because it's what I have on hand so I estimate I will end up in the lower 30s.

16th March 2005, 04:52 AM	#4
jleaman Banned Join Date: Apr 2002	What pcb / schematic software are you useing ? Is this a regulator circuit ?

16th March 2005, 04:57 AM	#5
ultrachrome diyAudio Member Join Date: Jan 2002 Location: Puget Sound	The first image I posted is a screen scrape of expresspcb. I drew the schematic I just posted in ms powerpoint.

16th March 2005, 06:10 AM	#6
jleaman Banned Join Date: Apr 2002	Is this a regulator circuit ? For any reason.. Id change the layout so that input is at one end and out put is at the other. Not them both at each end... Do yoU need help i could help you.. J

16th March 2005, 06:28 AM	#7
ultrachrome diyAudio Member Join Date: Jan 2002 Location: Puget Sound	I drew one side and saw that I could fit another supply on the board by rotating it 180 degrees. This seemed like a good solution because this board would fit with its long side near the back panel of the enclosure, with the transformer. This allowed each channel the shortest power wiring possible. I'll post a pic of the enclosure tomorrow. I rarely turn down help. Thanks.

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