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Detect voltage above range

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Wolf99

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Hi Folks

I am wondering if someone could help me with a circuit design that given a voltage (~0-10V range) and a threshold value (say 7V) would change output if the voltage rose above the threshold voltage.

The threshold however, is not set. Its controlled by a processor output pin(s).

Little bit inexperienced as to what is commercially available (what I should be searching for) and what I may need to design myself. If the threshold was set instead of variable, I wouldn't have too much difficulty, but this has confused me a bit.

Thanks
 

That's very easy to construct. You need only three main components in schematic:
  • 2x comparators
  • 1x AND gate
 
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    Wolf99

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sorry I realised I described the problem badly.

The o/p from the micro is binary representation of threshold level. (ie: 0111 for my previous example)

Monitored voltage is pulses at around 20-50kHz.

EDIT: thanks for replying Prototyp_V1.0, Am fiddling about with your suggestion, brain is fried after long day atm though :)
 

Wolf99 said:
The o/p from the micro is binary representation of threshold level. (ie: 0111 for my previous example)
Monitored voltage is pulses at around 20-50kHz.
Click to expand...
4bit-DAC + analog comparator (and, perhaps + resettable latch).
 
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    Wolf99

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Voltage divider (with resistor segments) can be programmed by switch that could be controlled digitally. Alternatively, reference voltage can be programmable digitally.
 
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    Wolf99

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Thanks folks, got my brain ticking along the right track :)

cheers
 

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