QUASI Amplifier for Beginners

apexaudio · 11:12 AM

Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust.

apexaudio · 24th May 2010, 03:50 PM

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

qsa · 24th May 2010, 05:53 PM

Quote:

Originally Posted by apexaudio

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

apexaudio · 24th May 2010, 08:26 PM

Quote:

Originally Posted by qsa

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

apexaudio · 24th May 2010, 08:48 PM

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.
Regards

apexaudio · 24th May 2010, 09:29 PM

Quote:

Originally Posted by apexaudio

I agree DIY isn't cost effective hoby, fishing is much better

Fisherman told me fishing isn't cost effective hoby, better buy fish

apexaudio · 25th May 2010, 11:46 AM

PSU from DC Servo MOSFET Amplifier with protect and clip also can be used for this amp.

FLT · 30th May 2010, 02:56 PM

Quote:

Originally Posted by apexaudio

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

apexaudio · 30th May 2010, 03:40 PM

Quote:

Originally Posted by FLT

Hi,

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

Frank

For single pair 2N3773 use +/-40V DC rail voltage.

jaycee · 30th May 2010, 04:01 PM

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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24th May 2010, 03:50 PM	#2
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	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

24th May 2010, 08:48 PM	#5
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	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. Regards

25th May 2010, 11:46 AM	#7
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	PSU from DC Servo MOSFET Amplifier with protect and clip also can be used for this amp.

30th May 2010, 04:01 PM	#10
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.