Ono PSU

AuroraB · 19th October 2007, 01:33 PM

I'm in the finishing stages of my two Ono's I've been working on for quite some time - I need to make the PCBs for the PSUs.
There are two versions on the net, one based on the original one with FET regulator, and an LM317 based verison. Any preferences of the two??

How much overvoltage do the FET regulator need? I have actually never used a FET regulator before......
I have some 28V toroids stashed away somewhere - just can't find them right now, and several 24V versions right at hand......
A 24 V tooroid with light load should easily deliver 34-35V.....

wayne325 · 20th October 2007, 03:16 AM

I think you need Vds to be at least 5V if you use the FET
regulator. Your 28 V toroids should do the trick... the 24V
toroids, not so much.

I've not got my PS tested yet but the schematic shows almost a
10V drop across the FET.

Since there is a low-pass filter between the regulator and
the amp circuits, I can't see that using an LM317 is going to
make much difference at all. But I have no experience with it.

19th October 2007, 01:33 PM	#1
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	Ono PSU I'm in the finishing stages of my two Ono's I've been working on for quite some time - I need to make the PCBs for the PSUs. There are two versions on the net, one based on the original one with FET regulator, and an LM317 based verison. Any preferences of the two?? How much overvoltage do the FET regulator need? I have actually never used a FET regulator before...... I have some 28V toroids stashed away somewhere - just can't find them right now, and several 24V versions right at hand...... A 24 V tooroid with light load should easily deliver 34-35V.....

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

20th October 2007, 03:16 AM	#2
wayne325 diyAudio Member Join Date: Jun 2005 Location: Dallas, Texas	I think you need Vds to be at least 5V if you use the FET regulator. Your 28 V toroids should do the trick... the 24V toroids, not so much. I've not got my PS tested yet but the schematic shows almost a 10V drop across the FET. Since there is a low-pass filter between the regulator and the amp circuits, I can't see that using an LM317 is going to make much difference at all. But I have no experience with it.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)