A new SOZ lurking..

Mad_K · 8th February 2003, 11:41 AM

Hi guys!

I am building myself a new SOZ, because I find I cannot live without one

I've buildt several version in the past; the latest one was converted to a A30. While the A30 shure is a nice piece of machinery, there is something magic about the SOZ. I feel I connect more to the music with it.

One other excuse to "just bulid another SOZ", is that I have all the parts I need in my junk-boxes.

BUT, I'm going to use 4,7R instead of the 8R....
My rails are going to be very near 21VDC. I know, I'm going to pay an efficiency penalty for this, but I think it will be sligtly better. (Higher bias (1,75->2,5A, higher voltage (7->9V) on the Drains.
I will also use schottky's and lots of Rifa PEH200's (no coils).
4,7R is Arcol HS50, 1R Arcol HS15. The toroid is a ToroidTM 600VA 2*18VAC (it's going to have a hard time with the 400W power demand

->It'll have to be a semi-open enclosure...

Anyways; I've been going through the U=RI/P=UI calculations, and it doesn't seem like R7 (the horisontal 1R) needs to be a high-power device. I was thinking a 2W metalfilm? <----

This one I would like to have some feedback on

I'll update as time permits.

I'd like some feedback on this, especially the R7 question

Henrik · 8th February 2003, 12:42 PM

Hi Mad_K

It seems to me, that you will get a voltageg swing at 1.5V at 1A over R7, so 2 W resistor might be a little on the edge.

I have simulated your setup, and here it seems as if you will lower the max output voltage swing a couple of volts by replacing all 8Ohms with 4.7Ohms and a lot more heat and stress to the 600VA transformer.
Any particular reason?

Mad_K · 8th February 2003, 12:52 PM

Thanks Henrik! How do you calculate the U/I for R7? I'm going to try so simulate some myself, but I've never done it before.

-I thought I got a few volts more outputswing?

The reason is that I have the 4,7R in my box.. Maybe I'll go into the thinking box a little more....

Henrik · 8th February 2003, 12:56 PM

Hi

So sorry, shure you will get 2 more volt´s output swing, my fault.
I did not calculate, I measured in the SIMetrix simulator, the easiet one to use, good, and it´s free.

Mad_K · 8th February 2003, 01:04 PM

Ohm's law told me I'd get 9 volts on the Drains....

Thanks for the tip on the sim, I'll try that later on...

Mad_K · 14th February 2003, 07:01 AM

How about something like this?

8th February 2003, 11:41 AM	#1
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	A new SOZ lurking.. Hi guys! I am building myself a new SOZ, because I find I cannot live without one I've buildt several version in the past; the latest one was converted to a A30. While the A30 shure is a nice piece of machinery, there is something magic about the SOZ. I feel I connect more to the music with it. One other excuse to "just bulid another SOZ", is that I have all the parts I need in my junk-boxes. BUT, I'm going to use 4,7R instead of the 8R.... My rails are going to be very near 21VDC. I know, I'm going to pay an efficiency penalty for this, but I think it will be sligtly better. (Higher bias (1,75->2,5A, higher voltage (7->9V) on the Drains. I will also use schottky's and lots of Rifa PEH200's (no coils). 4,7R is Arcol HS50, 1R Arcol HS15. The toroid is a ToroidTM 600VA 2*18VAC (it's going to have a hard time with the 400W power demand ->It'll have to be a semi-open enclosure... Anyways; I've been going through the U=RI/P=UI calculations, and it doesn't seem like R7 (the horisontal 1R) needs to be a high-power device. I was thinking a 2W metalfilm? <---- This one I would like to have some feedback on I'll update as time permits. I'd like some feedback on this, especially the R7 question __________________ Mads K

8th February 2003, 12:42 PM	#2
Henrik diyAudio Member Join Date: Feb 2002 Location: Copenhagen Denmark	Hi Mad_K It seems to me, that you will get a voltageg swing at 1.5V at 1A over R7, so 2 W resistor might be a little on the edge. I have simulated your setup, and here it seems as if you will lower the max output voltage swing a couple of volts by replacing all 8Ohms with 4.7Ohms and a lot more heat and stress to the 600VA transformer. Any particular reason? __________________ Henrik

8th February 2003, 12:52 PM	#3
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	Thanks Henrik! How do you calculate the U/I for R7? I'm going to try so simulate some myself, but I've never done it before. -I thought I got a few volts more outputswing? The reason is that I have the 4,7R in my box.. Maybe I'll go into the thinking box a little more.... __________________ Mads K

8th February 2003, 12:56 PM	#4
Henrik diyAudio Member Join Date: Feb 2002 Location: Copenhagen Denmark	Hi So sorry, shure you will get 2 more volt´s output swing, my fault. I did not calculate, I measured in the SIMetrix simulator, the easiet one to use, good, and it´s free. __________________ Henrik

8th February 2003, 01:04 PM	#5
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	Ohm's law told me I'd get 9 volts on the Drains.... Thanks for the tip on the sim, I'll try that later on... __________________ Mads K


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