ono and zener regulated power supply

patriz · 19th October 2004, 09:32 PM

hallo, as my ono phonostage is working wonderfully I'm trying to adopt the same zener regulated power supply for another project.
I need +/-24V and I'm using a24x2 transformer. I changed the zener to 6,8V and without load I have 23,9V at the output but loaded it drops to 21,9V and Vgs is only 4,6V, which is low for the current I'want.
I don't have the knowledge to solve by myself I appreciate your suggestion.
gio

Alain Dupont · 20th October 2004, 10:36 PM

patriz,

Here is the ONO power supply, which of the zener did you replace and what transfo did you use for your a 24x2 transformer VA ?

Regards.

Alain.

patriz · 21st October 2004, 08:47 AM

I replaced D1-D9 with 6,8V zeners.
the trans are r-core and actually are 23X2V.
Giorgio

Alain Dupont · 21st October 2004, 05:28 PM

patriz,

The 2* 24 AC transfo should do the job, it will give you 2*32 DC volts
and after the MosFets +-27 volts

The question is how much current you need now compared to the ONO

The resulting voltage should be stable, you have 10 volts more than the final DC output for the output,

But if the transfo is only 23X2 AC after the bridge its 23*1.33 = 30.5volts
the final could deliver about -+ 22 volts max...

You have to consider the 5.1 Ohms loss also, it is included in the CRC just after the bridge, I would like to know the DC "curent" you need to adjust all to work perfectly...

I"ll could check in PSU Designer, but I need to know the DC current !!!

Regards.

Alain.

patriz · 21st October 2004, 09:59 PM

alain,
after the bridge I have 28,8-29,1V
the load appear to need 200mA.
In those condiction I have 22,1-22,5V on the output. But if I put another 5,1R (R43)and 1000mf (C21) on the ouput the ripple seem to be pretty lower . This will lower the output voltage to 21,1-21,5V
Giorgio

Alain Dupont · 22nd October 2004, 12:34 PM

patriz,

before putting a CRC on the output, better try putting 2 larger caps
after the bridge, say 2*5.000 or 2*10.000 microF
and perhaps lower a little the 2* 5.1 Ohms to 2*3 Ohms

My PSU designer is uninstalled, but if you have a PC
try to find "PSU designer" its a modeling soft for power supply's
and a good one.

Best regards.

Alain.

19th October 2004, 09:32 PM	#1
patriz diyAudio Member Join Date: Oct 2004	ono and zener regulated power supply hallo, as my ono phonostage is working wonderfully I'm trying to adopt the same zener regulated power supply for another project. I need +/-24V and I'm using a24x2 transformer. I changed the zener to 6,8V and without load I have 23,9V at the output but loaded it drops to 21,9V and Vgs is only 4,6V, which is low for the current I'want. I don't have the knowledge to solve by myself I appreciate your suggestion. gio

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21st October 2004, 08:47 AM	#3
patriz diyAudio Member Join Date: Oct 2004	I replaced D1-D9 with 6,8V zeners. the trans are r-core and actually are 23X2V. Giorgio

21st October 2004, 05:28 PM	#4
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	patriz, The 2* 24 AC transfo should do the job, it will give you 232 DC volts and after the MosFets +-27 volts The question is how much current you need now compared to the ONO The resulting voltage should be stable, you have 10 volts more than the final DC output for the output, But if the transfo is only 23X2 AC after the bridge its 231.33 = 30.5volts the final could deliver about -+ 22 volts max... You have to consider the 5.1 Ohms loss also, it is included in the CRC just after the bridge, I would like to know the DC "curent" you need to adjust all to work perfectly... I"ll could check in PSU Designer, but I need to know the DC current !!! Regards. Alain.

21st October 2004, 09:59 PM	#5
patriz diyAudio Member Join Date: Oct 2004	alain, after the bridge I have 28,8-29,1V the load appear to need 200mA. In those condiction I have 22,1-22,5V on the output. But if I put another 5,1R (R43)and 1000mf (C21) on the ouput the ripple seem to be pretty lower . This will lower the output voltage to 21,1-21,5V Giorgio

22nd October 2004, 12:34 PM	#6
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	patriz, before putting a CRC on the output, better try putting 2 larger caps after the bridge, say 25.000 or 210.000 microF and perhaps lower a little the 2* 5.1 Ohms to 2*3 Ohms My PSU designer is uninstalled, but if you have a PC try to find "PSU designer" its a modeling soft for power supply's and a good one. Best regards. Alain.

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