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Old 4th January 2004, 01:48 PM   #1
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Default Eti 480 Pcb

I've searched and searched for a decent PCB layout for this amp but I can't find one. I have purchased one off Dick Smith and built it but I also want to make another one from scratch.

Does anyone have something I can print out and copy onto a blacnk board (using the old laser printer and iron trick)

Thanks

Liam.
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Old 4th January 2004, 09:34 PM   #2
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Ditch the ETI480 and go for the updated SC480, schematics, PCB layout etc can be found in Silicon Chip magazine about a year ago.

I know this is not exactly what you want but here is a link to a PCB supplier that has all the PCBs available. Search for "480" you will find the ETI480 and SC480.

RCS

Hope this helps
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Old 4th January 2004, 09:48 PM   #3
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The only reason I wanted the ETI version was to match the one I already have, but it seems I would be better off building the SC480.

O.K. then which one will I make? The one using TIPs or T03s?
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Old 5th January 2004, 04:33 AM   #4
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The kit price is less than $30.00 from memory - hardly worth going to the trouble of making your own pcb.
There are some small improvements to make that will improve performance quite markedly.

Eric.
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Old 5th January 2004, 09:00 PM   #5
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The T03 is harder to build, and has a larger PCB, so its harder to fit in a case. The T03 kit includes 3055/2955 output transistors which give marginal performance I have heard.

Dick Smith, JayCar and Altronics have this kit available. I would suggest you compare the quality and price. I think the price is around $45 to $56 dollars. They do come on special every so often.

Also, there are other amp kits available depending on your budget and requirements.
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Old 6th January 2004, 12:39 AM   #6
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"The T03 kit includes 3055/2955 output transistors which give marginal performance I have heard."
I did not use these when I built mine - I fitted Jap flat-pack output transistors instead (2SA1106?/2SC2579) and performed some improvements and these amplifiers worked extremely well and perfectly reliably.
There are better output transistors available nowadays than either type.

Eric.
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Old 6th January 2004, 03:11 AM   #7
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Default Improvements

Can anyone outline the SC or their own improvements to the ETI 480?
I've got a pair of these which I've used bridged to run a sub for several years, but would like to upgrade them...

Pete McK
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Old 6th January 2004, 04:09 AM   #8
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Hello Pete,
My improvements were as follows-

Shift the module power input directly to the emitter resistors.
Shift the output connection to directly between the output transistors ( this keeps speaker currents off the NFB trace).
Shift the speaker return (-ve) to the centre of the PSU and NOT connected to the pcb.
Use much larger value input capacitor (preferrably NP/Bipolar or PP type).
Replace the NFB shunt capacitor with larger value and NP/Bipolar type.

These are some of the mods as far as I recall.
This gave sonically much better performance than the magazine recomended version, and gave no oscillation or reliability problems.

Eric.
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Old 6th January 2004, 04:54 AM   #9
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Default improvements

Thanks Eric,
I'll keep these in mind when I get around to rebuilding the amp

Pete McK
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Old 8th January 2004, 05:06 AM   #10
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Default Re: Improvements

Quote:
Originally posted by PeteMcK
I've got a pair of these which I've used bridged to run a sub for several years, but would like to upgrade them...

Pete McK

Hey Pete, what sort of power supply have you got running the pair?
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