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Old 16th June 2003, 06:51 AM   #11
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Quote:
Originally posted by jwb
Hi Edwin. It's going well. I got a Sun 411 SCSI case to put the amp in and modified it for XLR connectors. I'm still in the process of drawing the printed circuit board. Hopefully I will finish it next weekend.

I also increased the design rail voltage to 14V.

Did you listen to it? How does it sound? What did you use before building this Aleph headphone amp?

Edwin
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Old 16th June 2003, 06:55 AM   #12
swede is offline swede  Switzerland
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Default Powersupply

So, how about the PS?

Are you going for an unregulated supply, or are you using a regulated?

I've been schetching on a regulated PS based on the circuit explained in the A75 article part 2, which I will use for my Aleph headphone amp.

//magnus
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Old 16th June 2003, 05:11 PM   #13
jwb is offline jwb  United States
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Default Re: Powersupply

Quote:
Originally posted by Edwin Dorre


Did you listen to it? How does it sound? What did you use before building this Aleph headphone amp?
I have listened to one channel on a breadboard. It sounds rather bad! But it is powerful and the bad sound is a result of poor layout, I hope.

My previous headphone amp was the Sheldon Stokes design seen on Headwize.

Quote:
Originally posted by swede
So, how about the PS?

Are you going for an unregulated supply, or are you using a regulated?

I've been schetching on a regulated PS based on the circuit explained in the A75 article part 2, which I will use for my Aleph headphone amp.
I am using four separate Sulzer regulators with AD797 error amp and ZTX869 for the pass transistor. The power dissipation is low enough to not require a big power transistor.

Cheers
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Old 30th August 2003, 01:03 AM   #14
jwb is offline jwb  United States
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Default Case finished

These Sun 411 SCSI cases are awesome for audio projects. The SCSI connector cutout is just the right size for two Neutrik XLR jacks. And, the case comes fully shielded contains a switched, fused power entry module. What more could I ask for?
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Old 30th August 2003, 01:05 AM   #15
jwb is offline jwb  United States
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Images taken with my cell phone!
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Old 30th August 2003, 01:17 AM   #16
jleaman is offline jleaman  Belgium
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That is a pretty good picture for a cell phone cam...
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Old 30th August 2003, 07:26 AM   #17
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Hello JWB,
check your output offset value
Marcello
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Old 30th August 2003, 03:56 PM   #18
jwb is offline jwb  United States
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Hello Marcello. Output offset is trimmed to zero, unmeasurable when the amp is warmed up. Why do you mention it?

By the way, your amp is my inspiration. Very nice job!
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Old 2nd September 2003, 01:25 PM   #19
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Hello ,
thanks for the compliment, but I've only turned the Pass' design into a smaller world.
In your design, the lack of a capacitor between R20 and the ground might bring about this problem, but if it works...
Very nice the "Sun Look"!!
Cheers
Marcello
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Old 5th September 2003, 12:55 AM   #20
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hey jwb ! your amp looks great!! i want to make an aleph headphone amp. where did yo get the case, it's awesome !!! greg
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