irs2092 schematic confirmation - Page 11

philuknow · 11:25 AM

no indeed! its just an alim thing that i didnt respect im sure, you make vss and vaa out of ±B ?

edit: just realise my CSL was at min, maybe just that also, gonn borrow that oscillo tonight and check it out again

nigelwright7557 · 10th August 2011, 08:18 PM

Quote:

Originally Posted by philuknow

no indeed! its just an alim thing that i didnt respect im sure, you make vss and vaa out of ±B ?

I used dropper resistors from b+ and b- for VAA and VSS.

philuknow · 12th August 2011, 12:49 AM

update:
realized that my amp op was dead too.. strange thing, ordered some.. didnt have spare
i made ±5V with ±B and external diodes, work great for now
w8ting for op amps..

luka · 12th August 2011, 05:15 AM

cool to hear that

philuknow · 02:28 AM

got my pwm working, everything in small signal is ok, tho i dont have amplified signal, looked up csh csl, was at max, csd is waving aroung 200mv referenced to gnd. got the same signal input as output 2Vp-p (by fb ?) nothing on HO LO, and Vb referenced to -B is 0V ???? tell me what you think.. not quiet sure bout the real source

edit:
realised csd was waving in same time as pwm

luka · 06:25 AM

Vb can not be 0v compared to -B and for that you don't even need scope, are you sure you measure those two pins?

Where do you get this pwm? sounds like it wants to start, I think I had it like this, but I couldn't supply enough voltage for upper fet (since he wanted to oscillate at lower MHz range)

I still think your voltages are off, can you check that again

Also, you could be at the point I was, where I needed strong input signal, to make it operational, then it worked, untill switched off again

BUT FIRST, how much is your Cfilter and remove it... I had it, and I had problems setting any higher freq, also amp started harder

philuknow · 16th August 2011, 11:25 AM

i didnt put Cfilter
pwm is from pin comp
i'm sure about Vb, no doubt, dont have
i didnt put R18 which charge cap on first oscillation tho
my input signal is kinda strong 2Vp-p

is CSD ok ? it is not supposed to be Vaa ?

philuknow · 18th August 2011, 11:59 AM

just realised it... pwm freq is about 60Hz (which is my input signal)
i guess its not normal uh ?

nigelwright7557 · 18th August 2011, 12:13 PM

Quote:

Originally Posted by philuknow

just realised it... pwm freq is about 60Hz (which is my input signal)
i guess its not normal uh ?

My PWM frequccny is about 250KHz. I can see the residual PWM on the output signal just a few volts.

luka · 18th August 2011, 06:41 PM

and I have 480k, so no, anything below 100k is not good

10th August 2011, 11:22 AM	#101
philuknow diyAudio Member Join Date: Feb 2009	no indeed! its just an alim thing that i didnt respect im sure, you make vss and vaa out of ±B ? edit: just realise my CSL was at min, maybe just that also, gonn borrow that oscillo tonight and check it out again Last edited by philuknow; 10th August 2011 at 11:25 AM.

12th August 2011, 05:15 AM	#104
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	cool to hear that __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

16th August 2011, 06:22 AM	#106
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Vb can not be 0v compared to -B and for that you don't even need scope, are you sure you measure those two pins? Where do you get this pwm? sounds like it wants to start, I think I had it like this, but I couldn't supply enough voltage for upper fet (since he wanted to oscillate at lower MHz range) I still think your voltages are off, can you check that again Also, you could be at the point I was, where I needed strong input signal, to make it operational, then it worked, untill switched off again BUT FIRST, how much is your Cfilter and remove it... I had it, and I had problems setting any higher freq, also amp started harder __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA Last edited by luka; 16th August 2011 at 06:25 AM.

18th August 2011, 06:41 PM	#110
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	and I have 480k, so no, anything below 100k is not good __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

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12th August 2011, 12:49 AM	#103
philuknow diyAudio Member Join Date: Feb 2009	update: realized that my amp op was dead too.. strange thing, ordered some.. didnt have spare i made ±5V with ±B and external diodes, work great for now w8ting for op amps..

16th August 2011, 11:25 AM	#107
philuknow diyAudio Member Join Date: Feb 2009	i didnt put Cfilter pwm is from pin comp i'm sure about Vb, no doubt, dont have i didnt put R18 which charge cap on first oscillation tho my input signal is kinda strong 2Vp-p is CSD ok ? it is not supposed to be Vaa ?

18th August 2011, 11:59 AM	#108
philuknow diyAudio Member Join Date: Feb 2009	just realised it... pwm freq is about 60Hz (which is my input signal) i guess its not normal uh ?

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