ETI 477 article

[kevinchiranga]

thanks for the web site.

i had a look at the given web site.
pcb uses surface mount devices.
so it is tough to make PCB myself
so if you scan the articles its easy for me

[sandyK]

If anyone requires a reasonable copy of the ETI 477 schematic for their personal records, please email me. I can't guarantee that all the component numbering is correct due to discolouration of paper with age. An educated guess had to be made with some numbering. The parts list should clear up any problems.
N.B. The file is about 2.2MB, as it was found to be needed for clarity.

SandyK

[sandyK]

OOPS ! I should have said AEM6005.

SandyK

[jacco vermeulen]

Originally posted by suzyj
The design

Mighty Miss Jackson,

very off topic, but any activity/progress in the bike frame building ?

[GeeVee]

Originally posted by sandyK
Kevin
Do you realise that these projects use the dual jfet ECG 461 in the input stage? It was made by New Tone Electronics (NTE) and it is almost certainly no longer available . It may be very hard to come up with a suitable substitute too.
SandyK

Hi.
Yes you are completey correct that the NTE461 is very difficult to source.
However WHOLESALE ELECTRONICS in the US still has limited supplies of them. http://www.weisd.com

As an alternative to the 461 device, I believe that BFQ16 dual fet was a suitable alternative. However this one may be even more difficult to obtain.

Regards,
George.

[suzyj]

Jacco wrote:

very off topic, but any activity/progress in the bike frame building ?

Alas no - the frame building activities have been indefinitely suspended, due to the purchase of a car which now fills much of my garage.

It's not quite as bad as it sounds though - I'm running it on biodiesel, so I'm still getting good play value

[feyef]

I am a friend of SandyK. Years ago he gave me his modified ETI 5000 amp with 477 modules, I still have it. Here is the circuit diagram (for an original, unmodified module) . I will also post some pictures, due to the size, one per post.

SuzyJ, I would be happy to loan you this amplifier to compare with yours, if you wish.

[feyef]

Here is the ETI 477 schematic digram

[feyef]

Here is a picture of the ETI 5000 amp with ETI 477 modules.

[feyef]

Here is a picture of the ETI 477 circuit board (track side).