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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

thanks
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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:
http://sound.westhost.com/project04.htm
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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?
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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 online now 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)

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.
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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!
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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


artQuake
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Old 11th October 2007, 07:21 PM   #8
lgreen is offline 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.
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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.
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