Roff
Well-Known Member
I must start earlier than you do (on the clock). I'll probably have mine in about 4 hours.Nigel Goodwin said:I'm getting that 'going down to open a bottle of cider feeling'
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I must start earlier than you do (on the clock). I'll probably have mine in about 4 hours.Nigel Goodwin said:I'm getting that 'going down to open a bottle of cider feeling'
Unstable. Oscillations.Roff said:Funny in what way?
As a comparator with both inputs tied to the same voltage, right? That is the very reason God gave us hysteresis.dknguyen said:Unstable. Oscillations.
Roff said:As a comparator with both inputs tied to the same voltage, right? That is the very reason God gave us hysteresis.
MAX912 has +V, -V, and GND pins.dknguyen said:Still doesn't explain how the op-amp/comparator knows whether or not it's working off of a dual-supply or single-supply with only two power pins!
I guess you could use a zener diode regulating from the high-side to get a comparator to output a low that is always a certain voltage below the high-side power rail. But I don't think that is how it is done.
dknguyen said:Still doesn't explain how the op-amp/comparator knows whether or not it's working off of a dual-supply or single-supply with only two power pins!
dknguyen said:Still doesn't explain how the op-amp/comparator knows whether or not it's working off of a dual-supply or single-supply with only two power pins!
I guess you could use a zener diode regulating from the high-side to get a comparator to output a low that is always a certain voltage below the high-side power rail. But I don't think that is how it is done.
Yes, but some comparators (like the LM311) that can operate from a dual supply have a GND pin and their output stage, basically an open collector transistor, can be connected to 0 V. So, the low level will be about 0 V.dknguyen said:Don't dual-supply op-amps wired as comparators saturate at the negative rails for a LO output and at the positive rails for a HI output?
Dk, I just told you the same thing in my last post. Pay attention!eng1 said:I'm looking at the datasheet from maxim-ic.com. That comparator does have a GND pin.