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Old 29th January 2011, 07:15 AM   #71
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Location: Pune
Viki, Can you post me the exact drawing and cuts you are looking for ? I will talk to my friend who is into metal works.
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Old 29th January 2011, 07:26 AM   #72
viki_v2 is offline viki_v2  India
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thank you, I will do it asap.
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Old 29th January 2011, 09:43 AM   #73
Roushon is offline Roushon  India
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Location: Mumbai (Bombay)
Hi Viki
The following are the threads I created for my project. It
took a long time as I did not have much time. The chassis I made
was 22inches x 15inches in size. There are four toroidals, four amps
(LM3886), remote control receiver, buffer circuit, soft start, delay power
on circuit, 64 step attenuator,... etc. It became very big as you can see
from the chassis size.

It is a silent amp, I feel I am lucky that I got it correct at first attempt.
It plays on the MJ King's open baffle I made....

Bridge or Parallel?

PCB design of parallel of two inverted LM3886 with buffer and dc-servo.

Suitable speakers

Phono-pre-amp+power supply pcb

But the above threads do not contain the final PCB designs or the picture of
the amp which I thought of uploading sometime.

Regards
Roushon.
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Last edited by Roushon; 29th January 2011 at 09:53 AM.
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Old 11th February 2011, 05:27 AM   #74
Roushon is offline Roushon  India
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Location: Mumbai (Bombay)
Default The art of electronics by Horowitz and Hill

`The art of electronics by Paul Horowitz and Winfield Hill'
second edition,printed for south Asia by Cambridge
University Press, Paperback, Rs 716/- available online
from `Pop A Book', Bangalore, free shipping.

http://www.popabook.com/The-Art-of-E.../9780521689175

This seems to be a fantastic book for beginners. Total
1125 pages of clearly written document on basics of
electronics. I just purchased.

Roushon.
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Old 14th February 2011, 06:44 AM   #75
Roushon is offline Roushon  India
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Location: Mumbai (Bombay)
Default Common Mode Choke

Does anyone know where can I find common mode choke
(2mH) for mains filtering? I salvaged one from a computer
SMPS and took it to a coil winding shop in Lamington
road in Mumbai. He is asking Rs 195/- a piece. It is too
much as the SMPS itself is about Rs 700/-. Is it
available ready made anywhere in Mumbai?

A picture is attached.

Roushon.
Attached Images
File Type: jpg common-mode-choke.jpg (7.8 KB, 157 views)
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Old 14th February 2011, 10:10 AM   #76
yajnaS is offline yajnaS  India
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195/- is VERY reasonable for a one-off handmade coil.

If you think that's too much, buy an SMPS and scrap it for the toroid.

p.s. make sure he has the right core.
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Old 14th February 2011, 10:30 AM   #77
Roushon is offline Roushon  India
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Quote:
Originally Posted by yajnaS View Post
195/- is VERY reasonable for a one-off handmade coil.

If you think that's too much, buy an SMPS and scrap it for the toroid.

p.s. make sure he has the right core.
Thanks Yajna! In fact I thought of purchasing some
discarded smps from Lamington road for the
choke.

Anyway, if anybody is interested the name of the choke
maker is `Disco Winding works' 384 Dongre Bldg. 2nd
Flr. Lamington Road, Mum-7, +91 22 23860318
as this is the purpose of this thread.

Roushon.
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Old 14th February 2011, 12:52 PM   #78
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Roushon, beware... how is he going to know what type and grade is the core? its important...
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Old 15th February 2011, 03:58 AM   #79
Roushon is offline Roushon  India
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Default Thanks!

Thanks Aucosticraft for the caution. I did tell him that
it is ring type ferrite core. Is it enough or there is some
variety of ferrite also which is suitable for suppression
choke?

Roushon
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Old 15th February 2011, 05:56 AM   #80
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Quote:
Originally Posted by Roushon View Post
Thanks Aucosticraft for the caution. I did tell him that
it is ring type ferrite core. Is it enough or there is some
variety of ferrite also which is suitable for suppression
choke?

Roushon
No, Here is an example of what I wanted to say.

But, don't go into depth unless its necessary. it depends where exactly where is the component used. can you tell me the application pl ?
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