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Old 24th May 2010, 10:54 AM   #1
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Default QUASI Amplifier for Beginners

Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust.
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File Type: jpg APEX 550W class B.jpg (325.1 KB, 12362 views)
File Type: jpg APEX 550w class B PCB.jpg (479.4 KB, 10570 views)

Last edited by apexaudio; 24th May 2010 at 11:12 AM.
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Old 24th May 2010, 03:50 PM   #2
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I use this circuit many times in the past for quick build 100-500w amp with parts which I already have, work every time, low cost and even begginer can do it as first amp ever. With two 2N3055 on +/-30V DC you can have 60W amp.
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Old 24th May 2010, 05:53 PM   #3
qsa is offline qsa  Germany
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Quote:
Originally Posted by apexaudio View Post
I use this circuit many times in the past for quick build 100-500w amp with parts which I already have, work every time, low cost and even begginer can do it as first amp ever. With two 2N3055 on +/-30V DC you can have 60W amp.
Regards
Is it cost effective quick build by yourself ?

,... because in our country to buy commercial similar amp from China is cheaper than semiconductor parts in our country for quick build
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Old 24th May 2010, 08:26 PM   #4
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Is it cost effective quick build by yourself ?

,... because in our country to buy commercial similar amp from China is cheaper than semiconductor parts in our country for quick build
I agree DIY isn't cost effective hoby, fishing is much better
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Old 24th May 2010, 08:48 PM   #5
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On the other hand any diyer have some old case, transformer, heatsink... only two new pcbs is needed for build functional amp, and have fun.
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Old 24th May 2010, 09:29 PM   #6
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I agree DIY isn't cost effective hoby, fishing is much better
Fisherman told me fishing isn't cost effective hoby, better buy fish
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Old 25th May 2010, 11:46 AM   #7
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PSU from DC Servo MOSFET Amplifier with protect and clip also can be used for this amp.
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Old 30th May 2010, 02:56 PM   #8
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Default scaled down version?

Quote:
Originally Posted by apexaudio View Post
I use this circuit many times in the past for quick build 100-500w amp with parts which I already have, work every time, low cost and even begginer can do it as first amp ever. With two 2N3055 on +/-30V DC you can have 60W amp.
Regards
Hi,

nice circuit. What about two 2N3773? 120W?

Frank
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Old 30th May 2010, 03:40 PM   #9
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Hi,

nice circuit. What about two 2N3773? 120W?

Frank
For single pair 2N3773 use +/-40V DC rail voltage.
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Old 30th May 2010, 04:01 PM   #10
jaycee is offline jaycee  United Kingdom
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I have to honestly say that I dont think "beginners" should be building powerful amps. I also don't see why theres no adjust - a resistor, a trim pot and a transistor dont exactly add a lot of complexity to the circuit.
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