Op amp question


by sr_sample
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negitron
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#19
Sep2-09, 08:47 AM
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Which brings up a point: if the OP wants time delays, why not a delay line? Cheap, reliable and easy to implement.
vk6kro
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#20
Sep2-09, 08:53 AM
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Yes.

Also, if he wants longer ones, there are dedicated monostable chips (like the 74C221) or programmable ones like the Picaxes for delays from 1 mS to years.
vk6kro
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#21
Sep2-09, 07:31 PM
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Negitron, I should have asked what kind of delay lines you mean. Like in TV sets?

This circuit behaves just like a comparator if you just vary the DC input levels. You hardly notice the poor rise and fall times caused by the capacitor.

So, whether you call it a comparator or an integrator depends on the input frequency.
It is a little of both.
negitron
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#22
Sep2-09, 07:39 PM
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I mean one of these.
vk6kro
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#23
Sep2-09, 08:31 PM
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I haven't heard of those for years. There were some magazine articles about using them to get echo effects.
Have you used them for anthing else?
Looks like they'd be fun to play with.


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