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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th April 2013, 11:25 AM   #251
manojtm is offline manojtm  India
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Hi Raj,

May be your relay blown.check your relay contacts

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MANOJ
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Old 14th April 2013, 11:47 AM   #252
manojtm is offline manojtm  India
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Hi Raj,

For making Class D amp you need a DSO, without oscilloscope you cannot find any problem

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MANOJ
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Old 14th April 2013, 01:29 PM   #253
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Hello sir what is DSO?? Where can I get that??
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Old 14th April 2013, 01:31 PM   #254
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Digital Storage Oscilloscope
for measure freaquency
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Old 14th April 2013, 01:43 PM   #255
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As far as oscilloscopes go, the Rigol DS2000 series gives the most bang for the buck, but if you do not have 800 dollars to spend and absolutely cannot wait until you do, the next best option is the Rigol DS1052 for just a mere 400 dollars.
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Old 14th April 2013, 03:14 PM   #256
akraj is offline akraj  Bangladesh
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Thanks Manoj, but relay is okay.
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Old 15th April 2013, 07:11 AM   #257
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Quote:
Originally Posted by akraj View Post
Hi Manoj:

For last few months I was experimenting on your aud600 ver1. Today mistakenly I gave .1uf cap and instantly 2k/2w resistor blown away. Replaced that and removed .1uf with 1uf cap.

But there is no audio even no grid. Replaced all ICs but no response. All relative voltage is okay, relay connects, no overload nothing unusual. Still no response.

How and what I can check? I don have oscilloscope. Please suggest.

Thanks
Raj
Hello sir. Can u shere ur experiments with us ..?

Thank u
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Old 15th April 2013, 07:42 AM   #258
akraj is offline akraj  Bangladesh
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What you want to know?
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Old 15th April 2013, 10:01 AM   #259
akraj is offline akraj  Bangladesh
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Hi Manoj:

If I can arragne DSO, where and what to measure? Test points and idle value/shape/voltage etc.

Thanks
Raj
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Old 15th April 2013, 01:11 PM   #260
manojtm is offline manojtm  India
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Hi Raj,

1. Remove 1nF capacitor connected to GND near 1N4148 x2(pin-2 of IC TL071) and use 33uH coil and add 1K resistor paralell with 1K 1% (frq. adjust)
2. Connect 1KHz signal if you have or any audio signal with min. volume
3. Check Pin-5 of IR2110 with DSO with respect to GND(it will show @400KHz square signal)

Regards
MANOJ

Last edited by manojtm; 15th April 2013 at 01:14 PM.
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