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Old 11th October 2007, 02:13 AM   #1
getafix is offline getafix  Philippines
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Default 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

forever dreaming of a better set-up...
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Old 11th October 2007, 02:35 AM   #2
paulb is offline paulb  Canada
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Here's a good place to start:
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Old 11th October 2007, 03:29 AM   #3
getafix is offline getafix  Philippines
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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...
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Old 11th October 2007, 07:39 AM   #4
amc184 is offline amc184  New Zealand
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For 20V rails, your looking at either 15-0-15, or a 15V transformer with dual secondaries.
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Old 11th October 2007, 08:09 AM   #5
CJ900RR is offline CJ900RR  Sweden
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To find out what the voltage will be after retification, use this formula

Vac * square root of 2 (1.4142)


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.
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Old 11th October 2007, 08:24 AM   #6
Nuuk is offline Nuuk  United Kingdom
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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.
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Old 11th October 2007, 07:11 PM   #7
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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

the truth is somewere
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Old 11th October 2007, 07:21 PM   #8
lgreen is online now lgreen  United States
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Default 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.

Click the image to open in full size.
Retired from DIY (2010) but still lurking now and again. My DIY audio projects-
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Old 12th October 2007, 09:41 AM   #9
AndrewT is offline AndrewT  Scotland
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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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