How to get 120v isolated from lm3886 power supply

nightanole · 31st March 2010, 02:43 PM

I have a chipamp.com kit with a 22-24vac X2 (havent load tested it yet) transformer. I also need to get 100-150vdc for the B+ of my tube buffer. Since its a tight fit i really dont want to install yet another transformer in the case. Could i use just a full wave voltage doubler to get the B+ from the dual 23vac secondaries?

File:Full-wave voltage doubler.svg - Wikipedia, the free encyclopedia

I figure that will get me about 130vdc.

star882 · 31st March 2010, 04:28 PM

You can definitely use a voltage multiplier. Or you can use a boost converter.

geraldfryjr · 1st April 2010, 10:39 AM

a voltage quadrupler will get you 124v to 135v but only use the positive side winding If you are going have a split supply. jer

31st March 2010, 02:43 PM	#1
nightanole diyAudio Member Join Date: Feb 2009	How to get 120v isolated from lm3886 power supply I have a chipamp.com kit with a 22-24vac X2 (havent load tested it yet) transformer. I also need to get 100-150vdc for the B+ of my tube buffer. Since its a tight fit i really dont want to install yet another transformer in the case. Could i use just a full wave voltage doubler to get the B+ from the dual 23vac secondaries? File:Full-wave voltage doubler.svg - Wikipedia, the free encyclopedia I figure that will get me about 130vdc.

31st March 2010, 04:28 PM	#2
star882 diyAudio Member Join Date: Mar 2007	You can definitely use a voltage multiplier. Or you can use a boost converter. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
LM3886 Power supply	jfnewell1965	Power Supplies	25	2nd June 2011 03:18 AM
15mA 120V AC Power supply dessign	binspaul	Power Supplies	4	11th May 2009 05:47 AM
1500VA power transformers 120V:120V	RyanW	Swap Meet	4	17th February 2009 08:31 PM
Power supply for LM3886	brconner	Chip Amps	7	23rd June 2008 01:48 PM
DIY 120V Power Supply	ak_47_boy	Power Supplies	13	21st January 2007 09:22 PM

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

1st April 2010, 10:39 AM	#3
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	a voltage quadrupler will get you 124v to 135v but only use the positive side winding If you are going have a split supply. jer

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