hi can anyone help me with this circuit - Page 2

bsm225 · 11th April 2012, 10:29 AM

oh ... yeah i got it from this forums and this the link Ultra Simple Class D

godfrey · 11th April 2012, 11:18 AM

Quote:

Originally Posted by bsm225

this the link Ultra Simple Class D

Thanks. From the attachment:

Quote:

Los componentes con valor DNP no deben colocarse (son para experimentos)

Google translate =>

Quote:

DNP-value components should not be placed (they are for experiments)

So U1D is just a buffer.

bsm225 · 11th April 2012, 11:29 AM

oh thanks .... so that mean U1D is just buffer and U1A is integrator which will change the PWM feedback from the power stage to triangle wave apply to U1B which is a comparotor and the output of U1B is PWM .... is that ryt

godfrey · 11th April 2012, 01:23 PM

Quote:

Originally Posted by bsm225

.... is that ryt

Yes. Here's some pictures to show the voltage at the outputs of U1A and U1B, with 20KHz input signal.

bsm225 · 11th April 2012, 01:40 PM

thanks man that great .. but can i ask which software u used to simulate this circuit

godfrey · 11th April 2012, 08:26 PM

I use the free version of SIMetrix-SIMPLIS.

bsm225 · 12th April 2012, 02:30 AM

sorry for asking to much Q .. but D1 and D2 have any function in the ciruit

godfrey · 12th April 2012, 02:56 AM

Where are they? I can only see D3, D4, D5 and D6. Sometimes numbers go missing when you add components to a schematic, then delete them.

bsm225 · 12th April 2012, 03:39 AM

D5 and D6 the parallel withe R5 and R6

godfrey · 12th April 2012, 08:16 AM

Those are Zener diodes. They protect the MOSFETs by ensuring that their Gate-Drain voltage is never more than 12V

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11th April 2012, 10:29 AM	#11
bsm225 diyAudio Member Join Date: Dec 2011	oh ... yeah i got it from this forums and this the link Ultra Simple Class D

11th April 2012, 11:29 AM	#13
bsm225 diyAudio Member Join Date: Dec 2011	oh thanks .... so that mean U1D is just buffer and U1A is integrator which will change the PWM feedback from the power stage to triangle wave apply to U1B which is a comparotor and the output of U1B is PWM .... is that ryt

11th April 2012, 01:40 PM	#15
bsm225 diyAudio Member Join Date: Dec 2011	thanks man that great .. but can i ask which software u used to simulate this circuit

11th April 2012, 08:26 PM	#16
godfrey diyAudio Member Join Date: Nov 2009 Location: Cape Town	I use the free version of SIMetrix-SIMPLIS.

12th April 2012, 02:30 AM	#17
bsm225 diyAudio Member Join Date: Dec 2011	sorry for asking to much Q .. but D1 and D2 have any function in the ciruit

12th April 2012, 02:56 AM	#18
godfrey diyAudio Member Join Date: Nov 2009 Location: Cape Town	Where are they? I can only see D3, D4, D5 and D6. Sometimes numbers go missing when you add components to a schematic, then delete them.

12th April 2012, 03:39 AM	#19
bsm225 diyAudio Member Join Date: Dec 2011	D5 and D6 the parallel withe R5 and R6

12th April 2012, 08:16 AM	#20
godfrey diyAudio Member Join Date: Nov 2009 Location: Cape Town	Those are Zener diodes. They protect the MOSFETs by ensuring that their Gate-Drain voltage is never more than 12V