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Old 18th July 2010, 10:50 AM   #1
sekhar is offline sekhar  India
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hi,
I am sekhar from west bengal / Siliguri . i have been making amps for a long time now, first i started with chip amps , then moved on to making more complex transistor & mosfet amps ,,,,, things have worked out well with my amps ... my latest amp was "legend stage mk2 500W rms at 8E" I have moved on to making of Studio Se(dr bora) And B500 from Apex Audio , i design my own pcbs and a few circuits as and when needed .........
but there are a few problems
1. Avaiblity of Amp Cabinets & heat sink
2. Avaiblity of Quality Speakers
3. Avaiblity of components (Specifically high power mosfets & BJts)

Can anybody help me with the above mentioned stuff


regards
sekhar
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Old 19th July 2010, 06:07 AM   #2
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Join Date: Jul 2003
Location: Dona paula, Goa
R junkyards anywhere near your place. May be u should visit them.
Amp cabinets can be made with 'L' aluminium or iron plates. Make a welded frame of suitable size and fix panels to it. Go to some workshop.

Quality speakers: God help u with those.

For high power devices, visit ebay, digikey, mouser, farnell, etc

Gajanan Phadte

Last edited by gmphadte; 19th July 2010 at 06:09 AM. Reason: added content
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Old 19th July 2010, 06:47 AM   #3
sangram is offline sangram  India
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Heatsinks aren't a problem in Calcutta at least, you get good profiles with up to 0.5C/W with nice flat backs. Little expensive, but in line with international prices.

Toshiba C5200/A1943 are available pretty easily (others may also be easier to find), FETs are significantly more difficult because the ones that are available are used for power supply applications, I have only found 540/9540 pairs that are of any use (and that too, in TO-220 case so application is limited). Drivers are considerably more difficult to find, I've had to import them in the past due to non-availability of equivalent devices in complementary pairs.

Speakers - you have to import. There is simply no Indian speaker manufacturing of any quality or standard, there is a guy here called hunter audio who manufactures some speakers for the Pro market, look at the [India] threads for the saga of his speakers. For reasonable quality, one has to get stuff from abroad.

I (and others) have used the Peerless range of drivers and while they do offer some level of consistency, it is still a long way from being mid fidelity, at least the range that is offered in Indian retail. these are only available in Mumbai as of now.
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Old 19th July 2010, 09:31 AM   #4
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Location: Bangalore, India
Just mail me at cred_audio@rediffmail.com

I can help you source parts for both Hi-Fi and PA including high power speakers.

Sam
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Old 19th July 2010, 08:13 PM   #5
sekhar is offline sekhar  India
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can any body help me with good amp cabinets ????



regards
sekhar
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Old 19th July 2010, 08:16 PM   #6
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I can get them custom-made. Do you have any specific design or want a generic one? What about heatsinks and drilling details?
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Old 20th July 2010, 06:48 AM   #7
sekhar is offline sekhar  India
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Quote:
Originally Posted by Samuel Jayaraj View Post
I can get them custom-made. Do you have any specific design or want a generic one? What about heatsinks and drilling details?
just reference sake can this type of amp cabinets be made ................
wat sort of generic types r u talking about ??????????? please post some pictures if possible and check ur mail i have sent some details of driver that i need if possible reply to that .............




regards
sekhar
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Old 20th July 2010, 07:25 AM   #8
sekhar is offline sekhar  India
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Join Date: Jul 2009
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here is some of my diy stuff ...........
wat do u people think ???????????/






regards
sekhar
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Old 20th July 2010, 08:11 AM   #9
shaan is offline shaan  India
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For quality full range speakers you can go for TV speaker manufacturer... as retailers in chandni chawk would collapse from shock if you ask them to get you a couple of better than average "fullranges", 4" 5watt TV speakers from Sweton can help you with small power needs. I have used them and they sound best amongst the 5watt range. Next would be Sunvoice. They also manufacture TV speaker, however, their site states there are Japanese influence on the technology they use to make the voicecoils and diaphragms. Yes I have bought a couple of 4" 15watt fullranges from Sunvoice... They sound decent and are my choice of speakers. For 6" and above there actually are a lot of supply in chandni chawk, BUT, most of the time you ask them to get you a fine fullrange they will say "NO SIR, we dont have it." But when you say to them "please bhai, woh jo 8" speaker dikhai de raha hai rack mei, woh zara dikhayenge?", they show you that speaker and after you buy it and test it at your home you find out its actually a excellent speaker, my discovery of the Sunvoice speakers went kinda like the same way. The problem is the retailers are almost always not at all interested to the info about what they sale nor do they care, you ask them for a speaker and buy it, there is chance that the speaker is faulty, there IS a trend of selling out and clearing the stock of faulty speakers. We can only be sorry about it.

Anyway, good luck.You can buy as much aluminium plates as you want from the dealers in Barabazar, Howrah and make decent cabinets from them and heatsinks too... unfortunately the same doesn't go for the speakers... so... all the best.

btw, Sunvoice have ranges of 16ohm speakers too... you may like to see this... the lowermost speaker in the page. >>> http://sunvoice.in/product2.html
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Last edited by shaan; 20th July 2010 at 08:31 AM.
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Old 20th July 2010, 11:29 AM   #10
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hi,
i am also suffering from these problems.the most powerful transister i found at my place is 2N3773.Drivers are BD139/40.I think that with these parts i can not go beyond 200 watts.kindly sugest me some good quasi circuits with these parts.
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