Power supply

JozzaG · 4th February 2010, 02:39 AM

i recently bought a transformer, expecting it to be Centre tapped, however when it arrived it was not. the schematic i have retrieved and decided to use for bulding a power amplifier requires it to be centre tapped.
i bought the M2158 from Dick Smith Electronics
Transformer 0-24V @ 3A (M2158) | Dick Smith Online Store
is there a simple way to use this transformer or is it just easier to buy a new toroidal transformer 80VA 18-0-18.

sphinx · 4th February 2010, 02:59 AM

see Half-Wave Rectifier on this webpage:

Basic Rectifier Circuits

JozzaG · 4th February 2010, 03:04 AM

cheers for that ill look over it.

dangus · 7th February 2010, 04:51 AM

If the core isn't welded, remove it, unwind the secondary (count the turns) and add a centre tap. I've done this a couple of times. Half wave isn't ideal for power amps; ripple is going to be much worse than with a full-wave supply. It's a useful cheat, though, for low power stuff, like a preamp, if it's followed by regulators. Then you can use an AC wall-wart since those are dirt cheap.

4th February 2010, 02:39 AM	#1
JozzaG diyAudio Member Join Date: Feb 2010 Blog Entries: 1	Power supply i recently bought a transformer, expecting it to be Centre tapped, however when it arrived it was not. the schematic i have retrieved and decided to use for bulding a power amplifier requires it to be centre tapped. i bought the M2158 from Dick Smith Electronics Transformer 0-24V @ 3A (M2158) \| Dick Smith Online Store is there a simple way to use this transformer or is it just easier to buy a new toroidal transformer 80VA 18-0-18.

4th February 2010, 02:59 AM	#2
sphinx diyAudio Member Join Date: Nov 2004 Location: Toronto, Ontario	see Half-Wave Rectifier on this webpage: Basic Rectifier Circuits __________________ too many projects...not enough time

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
LTspice tool for power amp power supply component evaluation	andy_c	Software Tools	2	23rd August 2009 05:10 PM
selling high current power supply for power amps.	ericpeters	Swap Meet	0	14th January 2005 02:21 PM
How do I diy Hi-End filter power supply and power cord?	bmpa	Parts	6	24th April 2004 12:12 AM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED?	jarthel	Tubes / Valves	10	21st July 2003 01:30 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

4th February 2010, 03:04 AM	#3
JozzaG diyAudio Member Join Date: Feb 2010 Blog Entries: 1	cheers for that ill look over it.

7th February 2010, 04:51 AM	#4
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	If the core isn't welded, remove it, unwind the secondary (count the turns) and add a centre tap. I've done this a couple of times. Half wave isn't ideal for power amps; ripple is going to be much worse than with a full-wave supply. It's a useful cheat, though, for low power stuff, like a preamp, if it's followed by regulators. Then you can use an AC wall-wart since those are dirt cheap.

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