Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!umich!dgsi!paulh
From: paulh@cimage.com (Paul Haas/10000)
Newsgroups: sci.electronics
Subject: Re: Need analog opto-isolator or equiv.
Message-ID: <1990Sep26.184622.7104@cimage.com>
Date: 26 Sep 90 18:46:22 GMT
References: <222@nachos.SSESCO.com> <4054@kitty.UUCP>
Reply-To: paulh@dgsi.UUCP (Paul Haas/10000)
Organization: Cimage Corp, Ann Arbor, MI
Lines: 24

In article <4054@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
]In article <222@nachos.SSESCO.com>, elmquist@nachos.SSESCO.com (Chris Elmquist) writes:
]> Does anyone have a nifty circuit that will replicate a 0v to 5v DC
]> signal across an opto-isolated path..??  I need to read a meter
]> in a hostile environment with an A/D in a PC.  I don't want the
]> PC to get near this meter... this meter will be read, maybe, 10 or
]> 15 times a second so frequency response is not critical...
]> ... 
]> Any ideas would be appreciated.
]
]	Use an "isolation amplifier" specifically designed for this
]purpose, such as one manufactured by Analog Devices, Burr-Brown, etc.
]You can probably obtain an encapsulated device providing 1,000 volt
]isolation for as little as $ 25.00 in small quanitites.
]
]	My advice is to not even think of designing your own analog
]isolation circuit for a one-of-a-kind application.
]
You can also put a voltage controlled oscillator in the hazardous area
and use it to drive an opto-isolater.  Or choose your favorite way to
convert an analog signal to a digital one.
---
Paul Haas  paulh@cimage.com
(313) 677-2412