simple power supply schematics
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 Chip Amps Amplifiers based on integrated circuits

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 11th October 2007, 03:13 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, 03:35 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, 04:29 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, 08:39 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, 09:09 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.
 11th October 2007, 09:24 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, 08:11 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, 08:21 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.
 12th October 2007, 10:41 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. __________________ regards Andrew T.

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