simple power supply schematics

getafix · 11th October 2007, 02:13 AM

been browsing/searching through the threads for a simple power supply schematic that would power an OPA549 chip amp I'm planning on building (for guitar amp use)... and can't seem to find a basic schematic in this forum?

could anyone guide me to a schematic that I could follow...

I'm not to knowledgeable in electronics but could follow a schematic

thanks

paulb · 11th October 2007, 02:35 AM

Here's a good place to start:
http://sound.westhost.com/project04.htm

getafix · 11th October 2007, 03:29 AM

thanks for the link... very helpful indeed

My amp would be based on the OPA549 which according to the data sheet could handle voltages between 4 and 30V, would using a different transformer, say an 18-0-18, help? I plan on having rail voltage of 20V what size transformer should I use?

amc184 · 11th October 2007, 07:39 AM

For 20V rails, your looking at either 15-0-15, or a 15V transformer with dual secondaries.

CJ900RR · 11th October 2007, 08:09 AM

To find out what the voltage will be after retification, use this formula

Vac * square root of 2 (1.4142)

Ex:

18Vac * 1.4142 = 25.4556Vdc

You want 20Vdc. Just turn the formula to:

20Vdc / 1.4142 = 14.1422

A transformer of 14Vac is the closest you will get, but 15Vac would be just as fine to in your case.

Nuuk · 11th October 2007, 08:24 AM

This should also prove useful to you or any newbie wanting to build a GC!

artquake · 11th October 2007, 07:11 PM

Good practical informations can also found here :

Linear Power Supply Design by Rod Elliott

Power Supplies: Commentary for Consumers by Nelson Pass

Solid State Power Amplifier Supply by Dejan Veselinovic

artQuake

lgreen · 11th October 2007, 07:21 PM

Here is one of my schematics. O boy, thats big!

I posted this pic on my site because I kept forgetting which side of the diodes was which.

AndrewT · 12th October 2007, 09:41 AM

Hi Lgreen,
Could you describe the process for making the wav files? maybe a new thread with all the details for us newbies.
How about describing how we can generate different levels, eg.-20db -10db,-3db,-0.1db as well as -6db. is it possible to generate -0db without risking clipping of the signal?
and maybe a two tone sample for IMD tests.

Then how to get those signals out of the PC, both via the sound card with minimal degradation and onto a CD for audio testing.

11th October 2007, 02:13 AM	#1
getafix diyAudio Member Join Date: Jun 2003 Location: somewhere in Mandaluyong	simple power supply schematics been browsing/searching through the threads for a simple power supply schematic that would power an OPA549 chip amp I'm planning on building (for guitar amp use)... and can't seem to find a basic schematic in this forum? could anyone guide me to a schematic that I could follow... I'm not to knowledgeable in electronics but could follow a schematic thanks __________________ forever dreaming of a better set-up...

11th October 2007, 03:29 AM	#3
getafix diyAudio Member Join Date: Jun 2003 Location: somewhere in Mandaluyong	thanks for the link... very helpful indeed My amp would be based on the OPA549 which according to the data sheet could handle voltages between 4 and 30V, would using a different transformer, say an 18-0-18, help? I plan on having rail voltage of 20V what size transformer should I use? __________________ forever dreaming of a better set-up...

11th October 2007, 08:24 AM	#6
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	This should also prove useful to you or any newbie wanting to build a GC! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

11th October 2007, 07:11 PM	#7
artquake diyAudio Member Join Date: Mar 2005	Good practical informations can also found here : Linear Power Supply Design by Rod Elliott Power Supplies: Commentary for Consumers by Nelson Pass Solid State Power Amplifier Supply by Dejan Veselinovic artQuake __________________ the truth is somewere

11th October 2007, 07:21 PM	#8
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	here is another Here is one of my schematics. O boy, thats big! I posted this pic on my site because I kept forgetting which side of the diodes was which. __________________ Retired from DIY (2010) but still lurking now and again. My DIY audio projects- PartTimeProjects.com.


	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

11th October 2007, 02:35 AM	#2
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Here's a good place to start: http://sound.westhost.com/project04.htm

11th October 2007, 07:39 AM	#4
amc184 diyAudio Member Join Date: May 2007 Location: Christchurch	For 20V rails, your looking at either 15-0-15, or a 15V transformer with dual secondaries.

11th October 2007, 08:09 AM	#5
CJ900RR diyAudio Member Join Date: Jan 2006	To find out what the voltage will be after retification, use this formula Vac * square root of 2 (1.4142) Ex: 18Vac * 1.4142 = 25.4556Vdc You want 20Vdc. Just turn the formula to: 20Vdc / 1.4142 = 14.1422 A transformer of 14Vac is the closest you will get, but 15Vac would be just as fine to in your case.

12th October 2007, 09:41 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Lgreen, Could you describe the process for making the wav files? maybe a new thread with all the details for us newbies. How about describing how we can generate different levels, eg.-20db -10db,-3db,-0.1db as well as -6db. is it possible to generate -0db without risking clipping of the signal? and maybe a two tone sample for IMD tests. Then how to get those signals out of the PC, both via the sound card with minimal degradation and onto a CD for audio testing.

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
Universal power supply UIP-1 from former USSR schematics	petrkp	Tubes / Valves	4	12th November 2010 09:46 PM
simple bipolar power supply	BodomChild	Power Supplies	4	12th July 2006 07:25 AM
simple power supply question	zobsky	Parts	11	10th April 2004 12:00 PM
simple power supply question.....	Luke	Pass Labs	5	31st March 2004 06:22 AM
Simple 12V DC Power Supply for a Beginner?	Llamas	Everything Else	1	23rd August 2003 01:23 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