Zen4 power supplie! - Page 3

Tazzy · 17th January 2003, 08:01 AM

This is wat I'm going to use:

The inductors are 1,4mm if I'm not mistaken.

I'm switching over to a tube hybrid designed by Kristjian.
I'll be updating my Zen website I made today.
Kristjian's website could be a good source for some extra information, but most of the info is on www.passdiy.com

miguel2 · 17th January 2003, 09:03 AM

Hi,

In my ZenV4 I just have a single 20000uF electrolytic and then it goes directly to regulation. I am using 53V on the unregulated, after rectification. With this setup the amp is dead quiet, no hum at all.

arold19 · 17th January 2003, 04:36 PM

Ok!

Somebody tell me that it is good to but a 0,1uF capasitor on each diode of the bridge!

If I do that, I don't have to put the 1uF/MKP at the enter and at the output of the power supplie?

Philo · 17th January 2003, 06:08 PM

Arold,
The caps you are talking about are called snubber caps. They "buffer" sharp current swings going through the bridge rectifier, like when you turn the amp on. They also provide some quieting to the rectifiers which can be noisy. IMO, they are optional when dealing with amps less 50 watts as there are smaller swings and less filter capacitance. You can save a few bucks and just use the 1uF mylar caps shown in Tazzy's diagram. Many people say that you get more high freq detail when you use multiple electrolytic caps (4 or more) in a "bank" for filter capacitance. I do heartily recommend a poly or mylar 1uf cap after the electrolytics (also shown in the diagram). This will smooth out the sound of your amp. Especially if you use lower quality electrolytics for your filtering.

arold19 · 17th January 2003, 10:46 PM

Where can I find a poly or mylar 1uF capasitor on the digikey catalogue! I tried to find without succes????

moe29 · 17th January 2003, 11:27 PM

EF1105-ND is the part # for 1uf

Panasonic Miniaturized Metallized Polyester Film Capacitors

the 10uf part is used in the Zen V4
just look at the parts list
that's on the passdiy.com page.

of course you can also check out

www.partsconnexion.com/

for other examples

arold19 · 18th January 2003, 12:14 AM

It is good for the output capasitor but on the plan of the Zen V4 power supply, I see a 0,1 uF capasitor on the AV voltage, what I do with that ???

moe29 · 18th January 2003, 01:10 AM

it's a filter capacitor placed across the line to reduce noise.

it should be a high voltage AC line rated cap.

Philo · 18th January 2003, 02:53 AM

The cap doesn't have to be AC rated just high enough DC rated. The rule of thumb passed around here on the forum has been at least twice the voltage it will see, ie 120VAC choose a 250VDC rated cap or higher. Most people use 400VDC or 600VDC before the primaries and 250VDC after. Try to keep it in reason as this keeps your cost down and saves valuable space.

arold19 · 18th January 2003, 05:34 PM

At the primarie, I put a 1uF or a 0,1uF capasitor ???

On the shema bellow, it is a 1uF and on the shema of the Zen V4, it is 0,1uF???

17th January 2003, 06:08 PM	#24
Philo diyAudio Member Join Date: Jul 2002 Location: Ever sunny San Diego	Arold, The caps you are talking about are called snubber caps. They "buffer" sharp current swings going through the bridge rectifier, like when you turn the amp on. They also provide some quieting to the rectifiers which can be noisy. IMO, they are optional when dealing with amps less 50 watts as there are smaller swings and less filter capacitance. You can save a few bucks and just use the 1uF mylar caps shown in Tazzy's diagram. Many people say that you get more high freq detail when you use multiple electrolytic caps (4 or more) in a "bank" for filter capacitance. I do heartily recommend a poly or mylar 1uf cap after the electrolytics (also shown in the diagram). This will smooth out the sound of your amp. Especially if you use lower quality electrolytics for your filtering. __________________ Philip "If you didn't make it with your own two hands, its not really yours".

18th January 2003, 02:53 AM	#29
Philo diyAudio Member Join Date: Jul 2002 Location: Ever sunny San Diego	The cap doesn't have to be AC rated just high enough DC rated. The rule of thumb passed around here on the forum has been at least twice the voltage it will see, ie 120VAC choose a 250VDC rated cap or higher. Most people use 400VDC or 600VDC before the primaries and 250VDC after. Try to keep it in reason as this keeps your cost down and saves valuable space. __________________ Philip "If you didn't make it with your own two hands, its not really yours".

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17th January 2003, 08:01 AM	#21
Tazzy diyAudio Member Join Date: Jul 2002 Location: Netherlands	This is wat I'm going to use: The inductors are 1,4mm if I'm not mistaken. I'm switching over to a tube hybrid designed by Kristjian. I'll be updating my Zen website I made today. Kristjian's website could be a good source for some extra information, but most of the info is on www.passdiy.com

17th January 2003, 09:03 AM	#22
miguel2 diyAudio Member Join Date: Jun 2002 Location: Portugal	Hi, In my ZenV4 I just have a single 20000uF electrolytic and then it goes directly to regulation. I am using 53V on the unregulated, after rectification. With this setup the amp is dead quiet, no hum at all.

17th January 2003, 04:36 PM	#23
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Ok! Somebody tell me that it is good to but a 0,1uF capasitor on each diode of the bridge! If I do that, I don't have to put the 1uF/MKP at the enter and at the output of the power supplie?

17th January 2003, 10:46 PM	#25
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Where can I find a poly or mylar 1uF capasitor on the digikey catalogue! I tried to find without succes????

17th January 2003, 11:27 PM	#26
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	EF1105-ND is the part # for 1uf Panasonic Miniaturized Metallized Polyester Film Capacitors the 10uf part is used in the Zen V4 just look at the parts list that's on the passdiy.com page. of course you can also check out www.partsconnexion.com/ for other examples

18th January 2003, 12:14 AM	#27
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	It is good for the output capasitor but on the plan of the Zen V4 power supply, I see a 0,1 uF capasitor on the AV voltage, what I do with that ???

18th January 2003, 01:10 AM	#28
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	it's a filter capacitor placed across the line to reduce noise. it should be a high voltage AC line rated cap.

18th January 2003, 05:34 PM	#30
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	At the primarie, I put a 1uF or a 0,1uF capasitor ??? On the shema bellow, it is a 1uF and on the shema of the Zen V4, it is 0,1uF???