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Old 2nd August 2011, 02:13 PM   #1
MarianB is offline MarianB  Romania
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Default Low power amplifier

Greetings.

I'm in need of a simple low power amplifier, preferably with bipolar transistors ( complementary or not ), something between 30 and 50W on 4Ohm speaker, simple or duble power suply, it needs to be made with easy to find transistors, and not verry expensive, i need to built an amplifier like this for someone and i thougt here would be best to search, the net is full of things like that, yes, but not all of them are ok, and knowing here are many experts in the field i need youre advice in this matter, so any imput would be greatly appreciated.

Best wishes to all, Marian.
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Old 2nd August 2011, 03:29 PM   #2
alexcp is offline alexcp  United States
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Try a kit from AmpsLAB.
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Old 2nd August 2011, 03:49 PM   #3
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Original DX, less than $10 in parts per channel, single output pair of what have you, will do even 100W into 4A.
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Old 2nd August 2011, 04:13 PM   #4
MarianB is offline MarianB  Romania
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Maybe i didn't express my self properly so i apologise, what i need is an schematic of the cind of amplifier i have described in the first post here, i will buit the amp, i will desighn the PCB then make it on PNP method, i will do all the work there is on the amp, i just need a good schematic, one that someone had made it and was happy with it, so can anyone help me on that?
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Old 2nd August 2011, 04:22 PM   #5
lineup is offline lineup  Sweden
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Have a look at some power amplifier projects by Rod Elliott.
They have schematics and low cost parts.
ESP Projects Pages - DIY Audio and Electronics

Maybe this fit your request : http://sound.westhost.com/project3a.htm
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Old 2nd August 2011, 04:33 PM   #6
MarianB is offline MarianB  Romania
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ESP was my first choice when i have searched, but MJL21193 it's not cheap at all, in fact it costs more than the mosfet's of my high power amplifier so it is not cost efective, as i see it may be possible to change it with BD911/BD912, the same cind of devices but with lower ratings such as max voltage, max current and so on, so am i wright, can it be change with what i sayd?
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Old 2nd August 2011, 04:34 PM   #7
AndrewT is offline AndrewT  Scotland
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The original DX, it was guaranteed by the designer.
Or try the latest DX or any of the twenty seven variations that came in between, all but one of which, were guaranteed by the designer.

25W into 4r0 requires 14Vpk and 3.5Apk.
50W into 4r0 requires 20Vpk and 5Apk.
These can be met by single pair output stage powered by a 18+18Vac or 25+25Vac 160VA transformer.

The most expensive parts will be the chassis, the next most expensive will be the transformer.
Replacing an amplifier because it blew up, or was a bad choice, is likely to add no more than 10% to your budget.
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Last edited by AndrewT; 2nd August 2011 at 04:39 PM.
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Old 3rd August 2011, 06:48 AM   #8
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by MarianB View Post
Greetings.

I'm in need of a simple low power amplifier, preferably with bipolar transistors ( complementary or not ), something between 30 and 50W on 4Ohm speaker, simple or duble power suply, it needs to be made with easy to find transistors, and not verry expensive,
The Circlophone fits the bill exactly:
♫♪ My little cheap Circlophone© ♫♪
Compared to other low-cost designs, it is adjustment-free, requires no thermal compensation, is thermally stable, and offers better quality and performances.
It is happy with any parts, requires no selection or pairing, and runs on identical output transistors rather than complementary: the OP devices can be 2N3055 or similarly cheap transistors.

The PCB designed by Wakibaki has been tried and validated by odysseybmx414.
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Old 3rd August 2011, 08:29 AM   #9
forr is offline forr  France
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Mike Renardson's amp very detailed project is worth having a look :
MJR7-Mk5 Mosfet Power Amplifier
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Old 3rd August 2011, 09:57 AM   #10
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Hi,
Bipolar, low power, not expensive, easy available components...
I suggest a push pull 2N3055 !
this one for example :
http://78.229.172.208/ELEX/ARTICLES_...PLI-AUROCK.pdf
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