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Old 12th December 2010, 03:32 PM   #1
dano12 is offline dano12  United States
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Smile Class D amplifier using a 555 timer

As I've been messing around with various class D amps, I happened upon this video on youtube this morning: using a 555 timer as a class D amp.

Certainly lo-fi, but fun nonetheless

YouTube - Class D audio amplifier using only the 555 timer IC
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Old 26th April 2014, 08:12 PM   #2
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Default Was a tedious Saturday..then i decide to play with 555 timer chip

I have made something that may be a Class D (not sure)

Not that bad the sound....has very small power...but quality is not that bad....but a lot of adjustments should be made.

I have made also another one...but it is not exactly Class D.

https://www.youtube.com/watch?v=gN4798slnUw

regards,

Carlos
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File Type: jpg Amplificador classe D.jpg (670.7 KB, 183 views)
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Old 28th April 2014, 11:47 AM   #3
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Default Wrong resistor value

I am installing filter in the output to correct the wave shape into the speaker terminals.

Here you have correct value to the above mentioned error.

Uops, install a 100 ohms resistor from pin 3 to the complementary output.

regards,

Carlos
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File Type: jpg Untitled.jpg (815.0 KB, 124 views)
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Old 28th April 2014, 02:20 PM   #4
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Default Sorry...old charlie has not a good vision

I have measured...resistor is really 4700 ohms.

Also you can remove it and even putting a short into the diode string you will have it operating anyway..it is class B..sinal drives it.

It is an interesting toy to weekend..anything serious...has no power..and quality is just tolerable.

regards,

Carlos
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Old 28th April 2014, 05:12 PM   #5
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Default Here you have an update... things are now better

It is evoluting.... it is still a toy...but getting better.

The input amplifier, if you need it, them use it...showing in this schematic, only, the 555 chip and the output...now i have included a filter...waveshape is correct now.... or less wrong.

You do not know uncle charlie..but things i publish are tested, assembled and operates... they are not simulator stuff...tested...built..listened.

And you can listen..here you have the first one made....now the sound is better:

https://www.youtube.com/watch?v=gN4798slnUw

regards,

Carlos
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File Type: jpg Class D toy.jpg (133.4 KB, 100 views)
File Type: jpg DSCI0007.jpg (630.7 KB, 94 views)
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Last edited by destroyer X; 28th April 2014 at 05:15 PM.
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