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.
Does anyone have something I can print out and copy onto a blacnk board (using the old laser printer and iron trick)
Thanks
Liam.
VT Calais,
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
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
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?
O.K. then which one will I make? The one using TIPs or T03s?
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.
There are some small improvements to make that will improve performance quite markedly.
Eric.
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.
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.
"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.
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.
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
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
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.
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.
improvements
Thanks Eric,
I'll keep these in mind when I get around to rebuilding the amp
Pete McK
Thanks Eric,
I'll keep these in mind when I get around to rebuilding the amp
Pete McK
Re: Improvements
Hey Pete, what sort of power supply have you got running the pair?
PeteMcK said:
Hey Pete, what sort of power supply have you got running the pair?
PS
HI VT,
actually, it's a (far too}small transformer, I think about 32v/side as far as I remember;
I've got hold of a much bigger one (again can't remember the voltage, I'm in Bangkok sipping on a beer, can you blame me...)
so with the "new" transformer (actually a side of the road special),
the bridged pair out to put out some decent power...
cheers,
Pete McK
HI VT,
actually, it's a (far too}small transformer, I think about 32v/side as far as I remember;
I've got hold of a much bigger one (again can't remember the voltage, I'm in Bangkok sipping on a beer, can you blame me...)
so with the "new" transformer (actually a side of the road special),
the bridged pair out to put out some decent power...
cheers,
Pete McK
The Best Source!
Hi
Here's a link for getting a PCB pattern of ETI-480, if you're still interested in ETI modules...>>>
http://www.alphalink.com.au/~cambie/
It supplies almost everything about ETI-480.....
And have a look at other solid state amp on the link as well (interesting...)
Hi
Here's a link for getting a PCB pattern of ETI-480, if you're still interested in ETI modules...>>>
http://www.alphalink.com.au/~cambie/
It supplies almost everything about ETI-480.....
And have a look at other solid state amp on the link as well (interesting...)
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