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Old 9th July 2002, 10:07 AM   #1
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Default PCB pattern for 100W Amp

Sometime back in the 70s Electronics for You International, an Australian magazine carried a project on a 50/100W amp. It has 1/2 pairs of 2N3055 and 2955 transistors with BD139-40 in the driver stage. I have tried to post the schematic but have some problems in doing so.

Does anybody have a downloadable pcb pattern for this amp?
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Old 9th July 2002, 12:21 PM   #2
Vivek is offline Vivek  India
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Hi Shashidhar,
Could you mail the schematic or whatever you have to me? Here is one link you would like to see http://users.auth.gr/~mixos/projects...3/index_en.htm
Cheers,
Vivek
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Old 9th July 2002, 12:38 PM   #3
palesha is offline palesha  India
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Hi Shashidhar,
There was a very popular article in 70's about 100w amp from Australia known as ETI-480. Then the same designer recently redesigned it with the name digi-125. It is available on the net. If u need the pcb pattern of the above mentined circuit then let me know.
Mahendra Palesha
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Old 9th July 2002, 12:44 PM   #4
Vivek is offline Vivek  India
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Hi Palesha,
Do you have a link where I can get the PCB layout and schematic and possibly some text.
Cheers,
Vivek
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Old 9th July 2002, 04:33 PM   #5
palesha is offline palesha  India
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Dear Vivek,
Namaste! Here is the link u have asked for. Enjoy diyaudio hobby.
http://www.alphalink.com.au/~cambie/
Mahendra Palesha
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Old 9th July 2002, 04:36 PM   #6
Vivek is offline Vivek  India
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Hey Palesha,
Thanks a ton man.
I would also like the views of other DIYers about the amp. Thanks.

Cheers,
Vivek
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Old 9th July 2002, 06:47 PM   #7
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Hi Vivek,
20 yrs ago I built 2 ETI-480 modules onto one heatsink and fitted them into a Nikko amplifier with blown output stage - it was in the back shed and my boss gave it to me.
I used Jap flatpack output transistors, high quality capacitors with bypassing lower values, and power fed direct to the output stage (bypassing the fuses).
With 2 5-1/4" placed ontop of this amp, it ran perfectly reliably at full power at a million parties.
The sound quality was really good, everybody danced all night, and the neighbours never complained.
You should read all Paul Cambies stuff.
As an easy to build and reliable amp, and sonically decent, this one is quite okay.
If you run modern better than 3055 outputs and 50v rails and fan cooling, this amp will go quite loud.
Dick Smith and other suppliers still stock this as a kit.

Regards, Eric.
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Old 10th July 2002, 07:53 AM   #8
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Default PCB Pattern for 100W Amp

Vivek, Palesha and Mr. Feedback,

Thanks all.

I shall check the sites you have mentioned.

I have designed a PCB myself on Protel for this 50/100 Amp. But I do not know how to attach the Schematic and PCB to this email page (not as a separate file). Can anyone enlighten me. I know the process -- I am a fairly computer literate chap, but I have problems with this particular site.

thanks.
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Old 10th July 2002, 08:33 AM   #9
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Thumbs up Good amp for the money, at the time.

Early 1978 I made a pair of the 50 watt versions of this amp and at the time a friend had a system with a Dynavector strain gauge cartridge, Crown (Amcron) IC150 preamp, DC300A power amp, and Crown/RTR electrostatics with 2x10" woofers per side. We compared the power amps and the ETI-480's (stands for Electronics Today International magazine) didn't quite have the rock solid bottom end, and the upper mids had the very, very slightest film or veil on the sound. I only had 2x4700uF ps caps and the speakers were 4 ohm but the amp was meant for 8 ohm.

The verdict? 80 percent as good, but only about 1/12 the price at the time.

GP.
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Old 10th July 2002, 09:04 AM   #10
Vivek is offline Vivek  India
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Hi,
Looks like this is one more amp worth investigating. But how does this amp compare (sonically) to the Zens, Project 3As, JLHs, Leach amps and so on.
Eric, yes, the site does have a lot of stuff I could learn.
Shashidhar, I too had a similar problem uploading a jpg file sometime ago.
Regards,
Vivek
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