power supply sizing recomendations please

ericpeters · 11th May 2004, 08:30 PM

I want to build 2 monoblock power amps and i tipically want as much power as possible but also a high current amplifier because i will driving full range ribbon speakers with them.
I was thinking in continious power range of 200 watt/8ohm, 400 watt/4 ohm and 800 watt at

Because I lack the knowledge and experience to be able to build a complete amplifier from scratch i've decided to use the LC audio zappulse 2.2 se modules.
I currently run these modules in a temporary setup with a 50VAC / 500VA transformer and a PS with 12*4700uF capacitors (for 2 modules!) This is defenitely not sufficient for my speakers!

At first I wanted to install (in each monoblock) a 2*50V / 1000VA transformer and 2 pcs 47000uF capcitors, but if I use a 45VAC transformer I can use 4 pcs cheaper capacitors (63V) for the same price.
I'm also lookin at choosing 8 pcs 22000uF per mono amp but this would cost more at less capcity.

Any suggestions what would be the better choice?

BTW i want to build the PS as suggested on this page:
http://www.zero-distortion.com/techn...powersi_05.htm
so I've also done the calculations on the next 2 pages of this site

thanks

Eric

lucpes · 12th May 2004, 07:54 AM

You'd want slightly lower rails than 63V if you were to use 63V caps (the mains current can vary, under no load the voltage would increase a tad bit if the trafo is specced under load).

I'd go with a 1000VA/40VAC with good regulation which ain't a problem at this size (or 42VAC -for the sake of it- if you can custom order)/with one bridge/94.000uf/63V per rail/monoblock, for ribbons you don't need lots of power in the 8ohm zone, but large current capability in the 1-2-4 ohm region.

janneman · 12th May 2004, 08:10 AM

My friend has just done that for his 1-2 ohms ribbons. Two LC modules fed by 1000VA xformers and 33.000uF reservoirs. Look here: http://www.gydotron.com/ . He's thrilled. You can contact him, he'll love to share his experiences.

Jan Didden

ericpeters · 12th May 2004, 10:45 AM

Jan,

Small world, I'm actually visiting Guido this afternoon.

ericpeters · 12th May 2004, 08:47 PM

Guido's a lot bigger capacity in his amps and a lot lower voltage.

The soundquality in the treble region is considerably better, only one track of a record showed that immediately.
I'm not sure if this is because I run the modules at the limit voltage or just because of a too small ps (I expected that the bass would the biggest difference if the supply is too small)

I will probably make something similar like him with 42 volts transformers.

K-amps · 14th May 2004, 09:54 PM

With a 1000VA and 42vac secondaries, the DC rails will be about +/-58v dc. I built one amplifier with the above with 30,000uF per channel.

I could not get more than 165w into 8 ohms at clipping...

Not sure you will get the 200w @8E you are looking for but then would you need it?

Cheers!

ericpeters · 18th May 2004, 12:04 AM

Hi I updated the transformer to 1000VA 42VAC and the amp improved dramatically, treble, bass and soundstage.

I now will look for very good 63V capacitors to finish the project.

I'm thinking of BHC ALS30 or BHC Splitfoil (more expensive)

any other suggestions?

11th May 2004, 08:30 PM	#1
ericpeters diyAudio Member Join Date: Apr 2004 Location: Deep South	power supply sizing recomendations please I want to build 2 monoblock power amps and i tipically want as much power as possible but also a high current amplifier because i will driving full range ribbon speakers with them. I was thinking in continious power range of 200 watt/8ohm, 400 watt/4 ohm and 800 watt at Because I lack the knowledge and experience to be able to build a complete amplifier from scratch i've decided to use the LC audio zappulse 2.2 se modules. I currently run these modules in a temporary setup with a 50VAC / 500VA transformer and a PS with 124700uF capacitors (for 2 modules!) This is defenitely not sufficient for my speakers! At first I wanted to install (in each monoblock) a 250V / 1000VA transformer and 2 pcs 47000uF capcitors, but if I use a 45VAC transformer I can use 4 pcs cheaper capacitors (63V) for the same price. I'm also lookin at choosing 8 pcs 22000uF per mono amp but this would cost more at less capcity. Any suggestions what would be the better choice? BTW i want to build the PS as suggested on this page: http://www.zero-distortion.com/techn...powersi_05.htm so I've also done the calculations on the next 2 pages of this site thanks Eric

12th May 2004, 08:10 AM	#3
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	My friend has just done that for his 1-2 ohms ribbons. Two LC modules fed by 1000VA xformers and 33.000uF reservoirs. Look here: http://www.gydotron.com/ . He's thrilled. You can contact him, he'll love to share his experiences. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

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
power amp ps cap upgrade recomendations needed	crippledchicken	Parts	3	22nd January 2009 08:49 PM
some power amplifier recomendations	cd-i	Solid State	86	27th December 2008 08:06 AM
Sizing PP OPT	alexg	Tubes / Valves	14	11th June 2007 07:19 AM
Sizing a Regulator	cantskienuf	Tubes / Valves	5	17th May 2005 03:55 AM
help w/ enclosure sizing	mp3z24	Multi-Way	4	8th June 2002 12:36 AM

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

12th May 2004, 07:54 AM	#2
lucpes diyAudio Member Join Date: Dec 2003 Location: Iasi	You'd want slightly lower rails than 63V if you were to use 63V caps (the mains current can vary, under no load the voltage would increase a tad bit if the trafo is specced under load). I'd go with a 1000VA/40VAC with good regulation which ain't a problem at this size (or 42VAC -for the sake of it- if you can custom order)/with one bridge/94.000uf/63V per rail/monoblock, for ribbons you don't need lots of power in the 8ohm zone, but large current capability in the 1-2-4 ohm region.

12th May 2004, 10:45 AM	#4
ericpeters diyAudio Member Join Date: Apr 2004 Location: Deep South	Jan, Small world, I'm actually visiting Guido this afternoon.

12th May 2004, 08:47 PM	#5
ericpeters diyAudio Member Join Date: Apr 2004 Location: Deep South	Guido's a lot bigger capacity in his amps and a lot lower voltage. The soundquality in the treble region is considerably better, only one track of a record showed that immediately. I'm not sure if this is because I run the modules at the limit voltage or just because of a too small ps (I expected that the bass would the biggest difference if the supply is too small) I will probably make something similar like him with 42 volts transformers.

14th May 2004, 09:54 PM	#6
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	With a 1000VA and 42vac secondaries, the DC rails will be about +/-58v dc. I built one amplifier with the above with 30,000uF per channel. I could not get more than 165w into 8 ohms at clipping... Not sure you will get the 200w @8E you are looking for but then would you need it? Cheers!

18th May 2004, 12:04 AM	#7
ericpeters diyAudio Member Join Date: Apr 2004 Location: Deep South	Hi I updated the transformer to 1000VA 42VAC and the amp improved dramatically, treble, bass and soundstage. I now will look for very good 63V capacitors to finish the project. I'm thinking of BHC ALS30 or BHC Splitfoil (more expensive) any other suggestions?

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