optoisolators
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optoisolators

 
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Foaad
Guest
Posted: Wed Jan 19, 2005 9:59 am    Post subject: optoisolators Reply with quote
Hi again, thanks for your response.
Howcome your having a 415V supply? I tried this and I think i blew the chip

AC+ (120V) --- 10k resistor -- Pin 1 of PC814X
AC- --- Pin 2

then i started smelling something.
what do you use the diode for?

Thanks

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CBarn24050
Guest
Posted: Wed Jan 19, 2005 2:03 pm    Post subject: Re: optoisolators Reply with quote
Quote:
Subject: optoisolators
From: foaadnami@gmail.com (Foaad)
Date: 19/01/2005 03:59 GMT Standard Time
Message-id: <ce15315b.0501181959.1940d424@posting.google.com


I tried this and I think i blew the chip

AC+ (120V) --- 10k resistor -- Pin 1 of PC814X
AC- --- Pin 2


then i started smelling something.

Sounds like the resistor's wattage is to low, it needs to be at least 2W and it
will get hot!

Quote:
what do you use the diode for?


Diode? what diode?
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James Beck
Guest
Posted: Wed Jan 19, 2005 10:04 pm    Post subject: Re: optoisolators Reply with quote
In article <ce15315b.0501181959.1940d424@posting.google.com>,
foaadnami@gmail.com says...
Quote:
Hi again, thanks for your response.
Howcome your having a 415V supply? I tried this and I think i blew the chip

AC+ (120V) --- 10k resistor -- Pin 1 of PC814X
AC- --- Pin 2

then i started smelling something.
what do you use the diode for?

Thanks

You will exceed the PIV of the opto diode.

I would go :
AC+(Hot?) ---> 10K resistor (5Watt min) ---> Pin 1 opto
Pin 2 of opto to 1N4004 Diode Anode
Diode Cathode ---> AC-(Neutral?)

The 1N4004 will keep you from blowing the opto during the reverse
voltage portion of the AC waveform.

Jim

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