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Old 23rd January 2003, 03:06 PM   #1
cjunk is offline cjunk  Italy
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Talking New SOZ with pictures!

Dear Passophiles,
here is my brand new SOZ. This is my first amplifier. It has been lots of fun to build it, but quite hard from the mechanical point of
view. I work not far from Cinecitta' in Rome and I was lucky to met an harley biker whose job is to rebuild mechanical parts for broken cinematographic cameras. He helped me a lot with aluminium. Sometimes diy building helps you to make nice friends!

My design goal was a compact unit (to increase WAF) and as you can see I fitted inside a "small" box a 600 VA transformer and big
47,000 uF caps. Total weight should be over 20 kg. Caps and heatsinks are surplus stuff which put some constraints on the box design. Active devices are matched IRFP044 and power resistors are Dale RH series. I used 10 awg teflon copper wire for the power unit and 12 awg solid silver copper wire for the signal path.

The input voltage is around 23 V for about 10 W output.
The amps run quite hot, I did not measure them yet but they should be around 60 deg C. The measured DC offset is few tens of millivolts for both channels. The amps are not totally silent, but it is not bad for such a compact design. Probably I have to check the inductors, located just above the big toroid in the present layout.

Ah the sound... both rich and natural, full and detailed, and very live and dynamic!! They are wonderful partners for my diy speakers (TQWP with Fostex Fe103Z).

I wish to thank Mr Pass for his support to the DIY community
and all the forum members for so many hints and tips...

Carlo
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Old 23rd January 2003, 03:07 PM   #2
cjunk is offline cjunk  Italy
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rear view
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Old 23rd January 2003, 03:09 PM   #3
cjunk is offline cjunk  Italy
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soz again...
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Old 23rd January 2003, 03:09 PM   #4
jam is offline jam  United States
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Good work! How about some pictures of the inside?

Jam
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Old 23rd January 2003, 03:10 PM   #5
cjunk is offline cjunk  Italy
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inside top view
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Old 23rd January 2003, 03:11 PM   #6
cjunk is offline cjunk  Italy
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last view...
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Old 23rd January 2003, 03:36 PM   #7
Taco is offline Taco  Netherlands
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Nice looking amp. and the question how does it sound. (compared to your other stuff).
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Old 23rd January 2003, 06:51 PM   #8
PedroPO is offline PedroPO  Portugal
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nice looking amp!!

what is the output power / rail volts?

Did you use 50W or 100W resistors?

For the size of the big cans, I bet they are 100V rated or very old.

I would try newer/smaller one just to check sound quality.

I bought some 150000uF panasonic big cans real cheap and I'm feel that some high quality 47000uF are better then this babies.

I will use them in a 15W SOZ that I'm building.
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Old 23rd January 2003, 10:47 PM   #9
moe29 is offline moe29  United States
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are the 1ohm resistors on the front heat sink with
the MOSFETS? ...cause i don't see them

wow, looks great for a 1st amp...

i'm patiently waiting for my heat sinks so that
i can attempt my SOZ


moe29
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Old 23rd January 2003, 11:09 PM   #10
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Default What kind of speaker Cables are those?

It looks like 80 pin SCSI cable... arent those usually just tinned copper? How do they sound, are the pairs twisted?

-Paul
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