6v window comparator circuit

Thread Starter

Viktor Vaughn

Joined Mar 21, 2015
24
I want to construct a 6 volt monitor using 741 op-amps in a window comparator configuration, with an bi-color LED. I want the LED to burn green above 3 vots, red below 5.7 volts, and orange between 3 volts and 5.7 volts. Can anyone please point me in the right direction to accomplish this. Any resources or guidance would be most appreciated.
 

Alec_t

Joined Sep 17, 2013
14,336
You need to re-think your requirements. For any voltage from 3V to 5.7V both read and green LEDs will light. What happens below 3V or above 5.7V?
Do you intend to power the opamps from the 6V source you are monitoring, or will they have an independent supply (e.g. 9V)?
 

frpr666

Joined Feb 2, 2010
50
These comparators are easy to build with comparator (or op. amp.) and voltage reference.
I'm sending a pic. for discussion.:)
edit1: I think an attiny13A and a 7805 would be also solution.
 

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Alec_t

Joined Sep 17, 2013
14,336
Ok, for any voltage from 3V to 5.7V both read and green LEDs will light to make orange. But which LED (if any) should light below 3V or above 5.7V?
 
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