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Need help designing a digital circuit

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IndiJones

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tca965 аналог

I need to design a digital circuit that will output logic 1 and lit an LED when the input analog voltage is within a certain range (say 2-5 volt) and will output logic 0 elsewhere. A schematic would be very helpful. Thanks in advance!
 

Alexg

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What you need is called a "window comparator". Follows a link to one of many many ways of doing it. Do a search with windows comparator and you will find a lot of different circuits to opt from.

Window Comparator to Filter Input

Best regards,
Alexg
 

sigint

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Use a window comparator for indication only, not for voltage control - whwn used for control it will always oscillate.

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MITSUKO

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I think the chip you need is
TCA965 , by siemens if i'm not mistaking .
You can set the lower and higher trippoint and it gives you a signal inside window or without to high or without to low .
I must have a data sheet here somewhere , i'll see if i can find it .

Mitsuko
 

IndiJones

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Thanks! Any schematic would be very helpful.
 

sigint

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Check out Poptronix magazine they recently, within the last couple of years, had a column that addressed comparator usage. If that doesn't prove fruitful I think I have a couple of old designs I could share.

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IndiJones

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Thanks! I've done it with LF356N Opamp from National Semiconductor.
 

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