45W@8R 70W@4R CLASS B SO LOW DISTORTION. - diyAudio
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Old 12th July 2011, 09:43 AM   #1
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Thumbs up 45W@8R 70W@4R CLASS B SO LOW DISTORTION.

THIS AMP IS MADE AND LOOKING GOOD. SOUND IS GREAT AD IT GIVES GOOD BASS. NO DC AT OUT PUT AT ALL.

I CAN GIVE YOU THE PCB IF YOU WANT. (TIP35 AND TIP36)
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Old 12th July 2011, 11:00 AM   #2
poynton is offline poynton  United Kingdom
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Why are you shouting ?

Is the PCB for sale ?

.
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Old 12th July 2011, 11:03 AM   #3
Alfonz is offline Alfonz  Bulgaria
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Just looking good?! Give us some sch and stats.
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Old 12th July 2011, 11:09 AM   #4
AndrewT is offline AndrewT  Scotland
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Where?
I cannot see any details, no schematic, no wiring, no PCB layout, no BOM, no pics.
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Old 12th July 2011, 11:16 AM   #5
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Default You said that class B is low distortion dear harp

Can you explain this to me please?.... i though that for audio we would have more distortion when playing low volumes, while in class B, because of switching.

regards,

Carlos
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Old 12th July 2011, 11:25 AM   #6
AndrewT is offline AndrewT  Scotland
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D.Self defined "his version" of ClassB.
Most others refer to that biasing as ClassAB and to be more specific some call it optimal ClassAB biasing for minimum distortion.

The thread opener has not told us what he has created.
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Old 12th July 2011, 11:35 AM   #7
lineup is offline lineup  Sweden
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It is probably this amplifier
http://www.redcircuits.com/Page150.htm

Click the image to open in full size.
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Old 12th July 2011, 04:00 PM   #8
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Default interesting concept

I've thought about building this, the attraction of no Iq setting is a plus point.What do others think?
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Old 12th July 2011, 05:01 PM   #9
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My expectations of this circuit is very low - performance will be nothing special. The design is very basic and the components used are not state-of-the-art anymore. There are quite a number of ways in which this circuit can be improved. Having said that, I've still got a few of those 2N3055 and MJ2955 trannies lying around - might be fun to knock up this one on a piece of stripboard and run it off the bench supply.

The expense of a new transformer to actually use it would might not be warranted. There are lots of other much better circuits to be built with very minimal setup. Setting the Iq is not such a hardship - all that is required is a cheap multimeter.

PS - LTspice suggests that this would work as advertised. THD for 1kHz at 50W into 8 ohm is 0.07%.

Last edited by ingenieus; 12th July 2011 at 05:23 PM.
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Old 12th July 2011, 08:56 PM   #10
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Quote:
Originally Posted by destroyer X View Post
Can you explain this to me please?.... i though that for audio we would have more distortion when playing low volumes, while in class B, because of switching.

regards,

Carlos
hi . the worst distortion of an amplifier is measured when the amp is at the highest output power rate.(highest sound volume)
class B amplifiers have the worst distortion between other amp classes.

i meant this one has a lower distortion than most class B amps.
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