Problem with transfo connection

arold19 · 5th March 2003, 12:45 AM

Hello ! I have a problem !

I'm building the Zen V4 and today, I work on the transfo wire....

The probleme is:

-At the output of my transfo, I have 40 VAC at 60 Hz and I have "" 36 VDC "" at the output of my bridge ????

I suppose to have about 55VDC

I realy don't understand, the bridge is well instaled and I try many bridge and the result is the same !

Maby because I take the mesure without the capasitor but I don't think that this is normal....

Please, I need some help, I don't understand wath is appening now

RobPhill33 · 5th March 2003, 12:57 AM

the filter caps have to be installed, otherwise you will be measuring a full rectified waveform (not DC). If you have a scope I suggest you take a look.

Tube_Dude · 5th March 2003, 01:01 AM

Hi arold19!

You don't have a problem...conect a capacitor at the ouput of the bridge and everything will be fine!

The capacitor will charge in the peakes of the waveforme and you will end up with your espected voltage!

Cheers

Jorge

arold19 · 5th March 2003, 05:54 AM

OK Thank you, I will try it tomorow and I will give you some news...

Thank you !!!

arold19 · 5th March 2003, 06:25 PM

Thank you ! All is OK !

But I have a little question ! It is normal that when I fuse the primarie of the transfo with a 1.5 Amp fuse, the fuse broke 1 time on 2 heaven if the transfo is connect only at the capacitor ??

On the shema of Nelson Pass, it is written, "slow blow" fuse, I don't know what this mean !

Thank you

Tube_Dude · 5th March 2003, 06:53 PM

Hi Arold19

The fuse blow with the surge of the charging of the capacitors...yes you need to use a slow blow fuse!

It a fuse that need more time to blow ant take a surge...usualy it have sand inside.

All you need is to go to your local component shop an ask politly

a slow blow 1,5 Amp fuse!

Cheers

Jorge

Eric · 6th March 2003, 02:10 PM

Arold19: When I was building my first amp, I did the very same thing you did. I was very disappointed when the DC off the bridge was slightly lower than the voltage rating of the AC secondary. Then I hooked up my caps and everything was as expected! It saved me an embarassing call to the transformer manufacturer...

5th March 2003, 12:45 AM	#1
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Problem with transfo connection Hello ! I have a problem ! I'm building the Zen V4 and today, I work on the transfo wire.... The probleme is: -At the output of my transfo, I have 40 VAC at 60 Hz and I have "" 36 VDC "" at the output of my bridge ???? I suppose to have about 55VDC I realy don't understand, the bridge is well instaled and I try many bridge and the result is the same ! Maby because I take the mesure without the capasitor but I don't think that this is normal.... Please, I need some help, I don't understand wath is appening now

5th March 2003, 01:01 AM	#3
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	A lost capacitor! Hi arold19! You don't have a problem...conect a capacitor at the ouput of the bridge and everything will be fine! The capacitor will charge in the peakes of the waveforme and you will end up with your espected voltage! Cheers Jorge

5th March 2003, 06:53 PM	#6
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Al ok in your part of the old! Hi Arold19 The fuse blow with the surge of the charging of the capacitors...yes you need to use a slow blow fuse! It a fuse that need more time to blow ant take a surge...usualy it have sand inside. All you need is to go to your local component shop an ask politly a slow blow 1,5 Amp fuse! Cheers Jorge

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5th March 2003, 12:57 AM	#2
RobPhill33 diyAudio Member Join Date: Sep 2002 Location: Milton Ontario	the filter caps have to be installed, otherwise you will be measuring a full rectified waveform (not DC). If you have a scope I suggest you take a look.

5th March 2003, 05:54 AM	#4
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	OK Thank you, I will try it tomorow and I will give you some news... Thank you !!!

5th March 2003, 06:25 PM	#5
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Thank you ! All is OK ! But I have a little question ! It is normal that when I fuse the primarie of the transfo with a 1.5 Amp fuse, the fuse broke 1 time on 2 heaven if the transfo is connect only at the capacitor ?? On the shema of Nelson Pass, it is written, "slow blow" fuse, I don't know what this mean ! Thank you

6th March 2003, 02:10 PM	#7
Eric diyAudio Member Join Date: Nov 2000 Location: Central PA, USA	Arold19: When I was building my first amp, I did the very same thing you did. I was very disappointed when the DC off the bridge was slightly lower than the voltage rating of the AC secondary. Then I hooked up my caps and everything was as expected! It saved me an embarassing call to the transformer manufacturer...

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