regulated psu for gc

meta · 1st July 2004, 08:33 PM

Hi...

I'm designing the psu brd for the gc amp I'm planning and came up with this based on a circuit at pedjas' site...(PDF)

GC PSU

The +/-24V is for the lm3886's and the +/-15V for some INA134 balanced line receivers....

Does it look okay?

Thanks.

pete.a · 1st July 2004, 09:17 PM

Looks fine to me . Why not place the 15v regs on the un- regulated dc lines. That way you can put a variety of regs with different voltages, without up setting the regulator before it..as per the current arrangement.. 24v adj supplying 15v fixed

Just a thought..

meta · 1st July 2004, 09:47 PM

Hi...

Thanks for the reply...

I've just realised tho - the secondary on the tx is 30VAC - wont that mean then it'd be like 40+VDC hitting the vregs - the 7815/7915s are just not gonna have that..are they? Even 24V at input is too large no? mebbe a 2nd smaller tx just for the INA's would be better suited?

Cheers

Pedja · 1st July 2004, 10:42 PM

Quote:

Originally posted by pete.a
Why not place the 15v regs on the un- regulated dc lines.

That won't work. If you want the other regulators in such a setup, they can be put only after LM338s.

meta · 1st July 2004, 11:17 PM

Hi Pedja...

Yup, thats what i thought - but is 24V into the 78's ok? Isnt the max input V for 'em rated at 17.5V?

I have the transformer already (2 infact) and will be runnin 2 channels of a single lm3886 design into 4ohm speakers from it...

Best

Pedja · 1st July 2004, 11:35 PM

No, why 17.5V? Max input voltage for fixed 3-pin regulators is usualy 35V, and 40V for 7824. Though in some cases it is lower for negative regs. Simplest, check the corresponding datasheet.

meta · 2nd July 2004, 12:14 AM

was looking at the wrong table ;p

time to build

garbage · 7th July 2004, 08:05 AM

hi

wonder if using bigger caps like this will help in the supply?

1st July 2004, 08:33 PM	#1
meta diyAudio Member Join Date: Nov 2002 Location: London	regulated psu for gc Hi... I'm designing the psu brd for the gc amp I'm planning and came up with this based on a circuit at pedjas' site...(PDF) GC PSU The +/-24V is for the lm3886's and the +/-15V for some INA134 balanced line receivers.... Does it look okay? Thanks.

1st July 2004, 09:17 PM	#2
pete.a diyAudio Member Join Date: Jul 2002 Location: Nottingham	Layout Looks fine to me . Why not place the 15v regs on the un- regulated dc lines. That way you can put a variety of regs with different voltages, without up setting the regulator before it..as per the current arrangement.. 24v adj supplying 15v fixed Just a thought..

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Regulated or non-regulated SMPS	longitude	Class D	5	8th May 2007 04:02 PM
Need a little help with my first regulated PSU	jarros	Power Supplies	16	3rd May 2005 12:28 AM
Regulated PS Kit	cantskienuf	Chip Amps	7	24th September 2004 04:20 AM
Regulated PSU Help..	jleaman	Analogue Source	9	26th July 2004 01:36 PM
Regulated or no regulated PSU?	Higo	Chip Amps	2	16th July 2003 05:38 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

1st July 2004, 09:47 PM	#3
meta diyAudio Member Join Date: Nov 2002 Location: London	Hi... Thanks for the reply... I've just realised tho - the secondary on the tx is 30VAC - wont that mean then it'd be like 40+VDC hitting the vregs - the 7815/7915s are just not gonna have that..are they? Even 24V at input is too large no? mebbe a 2nd smaller tx just for the INA's would be better suited? Cheers

1st July 2004, 11:17 PM	#5
meta diyAudio Member Join Date: Nov 2002 Location: London	Hi Pedja... Yup, thats what i thought - but is 24V into the 78's ok? Isnt the max input V for 'em rated at 17.5V? I have the transformer already (2 infact) and will be runnin 2 channels of a single lm3886 design into 4ohm speakers from it... Best

1st July 2004, 11:35 PM	#6
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	No, why 17.5V? Max input voltage for fixed 3-pin regulators is usualy 35V, and 40V for 7824. Though in some cases it is lower for negative regs. Simplest, check the corresponding datasheet.

2nd July 2004, 12:14 AM	#7
meta diyAudio Member Join Date: Nov 2002 Location: London	was looking at the wrong table ;p time to build

7th July 2004, 08:05 AM	#8
garbage diyAudio Member Join Date: Apr 2004 Location: Singapore	hi wonder if using bigger caps like this will help in the supply?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)