Eti-477

rope · 5th July 2004, 01:10 PM

Hi all, i am looking for the article from ETI-june1982 the mosfet PA called project 477 .Please if anyone has it ,or a link to it, help me!
Thanks!!

Greg Erskine · 5th July 2004, 09:40 PM

Hi rope,

I'm assuming ETI 477 is a project from the now defunct magazine Electronics Today International.

ETI material is now owned by Silicon Chip and I believe they can provide copies of old articles. Try these links and email address.

http://www.siliconchip.com.au/
http://www.electronicsaustralia.com.au/
silchip@siliconchip.com.au

rope · 6th July 2004, 04:24 AM

Thanks Greg ,all you said is true ,but i have problem with the payment of these copies,i suppose they arent expensive ,but i havent got a credit card for now,that's the problem.

ashok · 8th July 2004, 02:18 PM

Hi Rope,
I found the March 82 copy of ETI. It has a 150 watt MOSFET PA amp design. The project number however is 499. You said June 82 and project 477 . I am not sure I have that copy. If you want 499 I can scan it and email it to you if you give me your email address.

The circuit uses two pairs of 2SK134/2SJ49 per channel.
Cheers.

rope · 8th July 2004, 02:59 PM

Hi Ashok ,i think there are two articles because there are two ETI magasines-ETI Australia and my case ETI-International-if yo have the issue send it to dronzin#yahoo.co.uk ,change beforethe # with @. I need the PCB artwork solder side scanned too,please!

rope · 10th July 2004, 06:43 PM

Thanks a lot to all who replyed to me ,especially to Ole who send me the article ,thanks a lot!

rajeev luthra · 5th August 2004, 05:14 AM

HI rope,
could you or Ole please send me the article of the Eti477 project
Thanks

george a · 5th August 2004, 01:01 PM

Hi Rajeev & rope

Why do you want this circuit?

I built it some 20 years ago and tossed it after poor (sonic )performance and instability (culminating in pcb fire)
I used the lefover bits to clone a Hafler dh-200 which has worked faultlessly since...
Just my 2 cents worth, hopefully others had better luck than I.

rope · 5th August 2004, 04:13 PM

Hi Gheorge -may i ask you few questions.
First-did you use the original PCB with all the original parts on it ?
Second -did you try to understand what caused the fire ,because
there are fuses which will blow long before the PCB gets on fire?
I have build myself Two of them but didnt try them and sold out 20 years ago.

To Rajeev - Ill try to scan the issue and send it to you -give me the e-mail. But i have no scanner so it can take some time.Meanwhile i can send you the Australian Issue in PDF files which i received from M-r Paul Cambie from Australia.

george a · 5th August 2004, 10:08 PM

Hi

Yes I did use orig PCB's
Amplifier was oscillating badly, after the fire (at reletively low volume) I placed some caps (a couple of pF) accross the 200ohm resistors to the output mosfets (or something like that).
This made themstable enough to use but sound was very very dull. Not a path on the Hafler

Mosfets were effectively on the PCb via the design layout.

5th July 2004, 01:10 PM	#1
rope diyAudio Member Join Date: Jul 2004 Location: Sofia	Eti-477 Hi all, i am looking for the article from ETI-june1982 the mosfet PA called project 477 .Please if anyone has it ,or a link to it, help me! Thanks!!

5th July 2004, 09:40 PM	#2
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	Hi rope, I'm assuming ETI 477 is a project from the now defunct magazine Electronics Today International. ETI material is now owned by Silicon Chip and I believe they can provide copies of old articles. Try these links and email address. http://www.siliconchip.com.au/ http://www.electronicsaustralia.com.au/ silchip@siliconchip.com.au __________________ Greg Erskine

6th July 2004, 04:24 AM	#3
rope diyAudio Member Join Date: Jul 2004 Location: Sofia	477 Thanks Greg ,all you said is true ,but i have problem with the payment of these copies,i suppose they arent expensive ,but i havent got a credit card for now,that's the problem.

8th July 2004, 02:18 PM	#4
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Eti-499 Hi Rope, I found the March 82 copy of ETI. It has a 150 watt MOSFET PA amp design. The project number however is 499. You said June 82 and project 477 . I am not sure I have that copy. If you want 499 I can scan it and email it to you if you give me your email address. The circuit uses two pairs of 2SK134/2SJ49 per channel. Cheers. __________________ AM

8th July 2004, 02:59 PM	#5
rope diyAudio Member Join Date: Jul 2004 Location: Sofia	E-mail Hi Ashok ,i think there are two articles because there are two ETI magasines-ETI Australia and my case ETI-International-if yo have the issue send it to dronzin#yahoo.co.uk ,change beforethe # with @. I need the PCB artwork solder side scanned too,please!


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10th July 2004, 06:43 PM	#6
rope diyAudio Member Join Date: Jul 2004 Location: Sofia	searching ended Thanks a lot to all who replyed to me ,especially to Ole who send me the article ,thanks a lot!

5th August 2004, 05:14 AM	#7
rajeev luthra diyAudio Member Join Date: Jun 2004 Location: Indore , India	HI rope, could you or Ole please send me the article of the Eti477 project Thanks __________________ RL

5th August 2004, 01:01 PM	#8
george a diyAudio Member Join Date: May 2002 Location: oz	Hi Rajeev & rope Why do you want this circuit? I built it some 20 years ago and tossed it after poor (sonic )performance and instability (culminating in pcb fire) I used the lefover bits to clone a Hafler dh-200 which has worked faultlessly since... Just my 2 cents worth, hopefully others had better luck than I. __________________ george a

5th August 2004, 04:13 PM	#9
rope diyAudio Member Join Date: Jul 2004 Location: Sofia	Eti477 Hi Gheorge -may i ask you few questions. First-did you use the original PCB with all the original parts on it ? Second -did you try to understand what caused the fire ,because there are fuses which will blow long before the PCB gets on fire? I have build myself Two of them but didnt try them and sold out 20 years ago. To Rajeev - Ill try to scan the issue and send it to you -give me the e-mail. But i have no scanner so it can take some time.Meanwhile i can send you the Australian Issue in PDF files which i received from M-r Paul Cambie from Australia.

5th August 2004, 10:08 PM	#10
george a diyAudio Member Join Date: May 2002 Location: oz	Hi Yes I did use orig PCB's Amplifier was oscillating badly, after the fire (at reletively low volume) I placed some caps (a couple of pF) accross the 200ohm resistors to the output mosfets (or something like that). This made themstable enough to use but sound was very very dull. Not a path on the Hafler Mosfets were effectively on the PCb via the design layout. __________________ george a

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