Unregulated PSU advice wanted

falcott · 25th August 2004, 06:49 PM

I'm building a GC, both amps powered by one transformer 2x25v. I want 35v supply to the amps. It seems that I have 2 or 3 basic options for an unregulated circuit, e.g.: 1 bridge; 2 bridges with single 0v rail; 2 bridges with 2x 0v rails... Can anyone please advise a suitable schematic for this purpose? I assume that one bridge per secondary is best, and that I need caps after them to get the voltage increase.
Thanks!

GregGC · 25th August 2004, 07:14 PM

I suggest read this first:
http://sound.westhost.com/power-supplies.htm

and then:
http://sound.westhost.com/project04.htm

You decide at the end. Now I most likely do the simpler version (one PS with one bridge for both channels). Get it working first and if you decide to improve at least you'd have some reference point. I you use reasonable power (up to 30-40W), don't be surprised if you don't hear any difference between the different PS. You kan still use 1000uF rail caps for each channel (total of 2000 per rail). Though, again you're free to experiment and go up to 10000 per rail if you want. Again, depends on how much power you need to pump into the speakers.

Greg

falcott · 26th August 2004, 06:01 AM

Thanks Greg, that's exactly what I was looking for.

25th August 2004, 06:49 PM	#1
falcott diyAudio Member Join Date: Jul 2004 Location: Wherever I hang my hat...	Unregulated PSU advice wanted I'm building a GC, both amps powered by one transformer 2x25v. I want 35v supply to the amps. It seems that I have 2 or 3 basic options for an unregulated circuit, e.g.: 1 bridge; 2 bridges with single 0v rail; 2 bridges with 2x 0v rails... Can anyone please advise a suitable schematic for this purpose? I assume that one bridge per secondary is best, and that I need caps after them to get the voltage increase. Thanks! __________________ "Everything should be made as simple as possible, but not simpler." - Einstein

26th August 2004, 06:01 AM	#3
falcott diyAudio Member Join Date: Jul 2004 Location: Wherever I hang my hat...	Thanks Greg, that's exactly what I was looking for. __________________ "Everything should be made as simple as possible, but not simpler." - Einstein

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25th August 2004, 07:14 PM	#2
GregGC diyAudio Member Join Date: Oct 2003 Location: Toronto	I suggest read this first: http://sound.westhost.com/power-supplies.htm and then: http://sound.westhost.com/project04.htm You decide at the end. Now I most likely do the simpler version (one PS with one bridge for both channels). Get it working first and if you decide to improve at least you'd have some reference point. I you use reasonable power (up to 30-40W), don't be surprised if you don't hear any difference between the different PS. You kan still use 1000uF rail caps for each channel (total of 2000 per rail). Though, again you're free to experiment and go up to 10000 per rail if you want. Again, depends on how much power you need to pump into the speakers. Greg

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