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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th April 2013, 08:41 PM   #271
stewin is offline stewin  Kenya
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any news on aud600 ver 3.0
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Old 27th April 2013, 03:18 PM   #272
manojtm is offline manojtm  India
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Hi Stewin,

There is no secret in AUD600 new versions.It is a sigma-delta design and i learn some lesson that i will share

TL071 using first Oscillator , this not a PWM, it acts only a osc. its freq. determined by two capacitor and one resistor. any of this value change frequency will be changed.
so c1=c2 constant and change the value of resistor not 0 ohm min 150 ohm to 2000 ohm. this will change the freq.
value increase= increase freq.
value decrease= decrease freq.
(ex. if the R= 1K and c=c1&c2=1000pf now freq. is @900KHz)
when the FB connected to the input of TL071 it will down the freq. to desired one (filter coil,FB resistor,capacitor and supply voltage will change the freq.)and now it will act PWM when audio signal input present.

so increasing the first osc. will give good sound quality.and the disadvantage is the stability of the amp is decreased, means any issue cause high freq. noise and it will damage IR2110,7404 and relay or SP
(it will go up to freq.=@1.6MHz.)

for stable use 500 ohm,470 ohm or 330 ohm resistor and change the FB resistor,coil and capacitor.
this will reduce the sound quality little but your amp is stable without any problem.

Regards
MANOJ
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Old 27th April 2013, 08:51 PM   #273
stewin is offline stewin  Kenya
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hi manoj . i was refering to the pcb version of your amp which has the relay and protect circuit on one board . pls post your schematic so i can try to design my own pcb .

by the way your amp is excellent it rocks . i tested it yesterday the protection is o.k
and sound quality and power are superb .will post photos later . pls post pcb of the version of everything on one board. :-)
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Old 2nd May 2013, 05:07 PM   #274
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Default drum core

hello sir can i use this core of LPF ??? thank u
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Old 3rd May 2013, 01:21 PM   #275
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hello sir can i use this core of LPF ??? thank u
Can I use this core for aud600 ..????
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Old 6th May 2013, 06:33 AM   #276
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Hi Manoj
greetings can 2n4861 be substituted by 2n7000 in your simple NE5532 LIMITER
warm regards
andrew lebon
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[image][/image]"It's Better to try and fail than to never know and always wonder"
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Old 8th May 2013, 10:26 AM   #277
manojtm is offline manojtm  India
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Hi All

Simple limiter using LDR+LED(SLA32SR3)

Regards
MANOJ
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Old 8th May 2013, 10:31 AM   #278
akraj is offline akraj  Bangladesh
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Originally Posted by manojtm View Post
Hi All

Simple limiter using LDR+LED(SLA32SR3)

Regards
MANOJ
Nice to see you back again.
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Old 8th May 2013, 01:21 PM   #279
manojtm is offline manojtm  India
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Quote:
Nice to see you back again.
Hi Raj

Thank you

attaching limiter wiring diagram

Regards
MANOJ
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Old 8th May 2013, 02:25 PM   #280
manojtm is offline manojtm  India
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Hi All

new Coil received for testing 450KHz switching AUD600 class D amp

Regards
MANOJ
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