Tagged Questions

13
votes
2answers
591 views

transmitting 5v signal over a long cable

I'm seeking for help here as I need a reliable answer to this. I need to get an input signal (low frequency 5v digital pulse), to a micro-controller from a ...
4
votes
1answer
121 views

Sampling frequency required to detect peaks

I am processing a signal in the digital domain and I have to detect "peaks" in it, e.g. by finding local maxima formed by three consecutive values. (More sophisticated criteria could be used like ...
3
votes
1answer
155 views

How can I tell if something's controlled by an analog or digital input?

Is there a way to tell if something's being control by an analog or digital input without knowing and understanding all the rest of the circuitry involved? I have a Wowwee robot (Elvis) that I'm ...
2
votes
4answers
517 views

How to decode morse code with digital logic

I have been curious as to how one might implement a morse code decoder with basic digital logic (no microcontroller), mostly as an exercise. I could decode individual letters with a state machine, if ...
2
votes
1answer
247 views

How to write a simple feedback loop in difference equation?

I know how to write a simple close loop transfer function which is http://en.wikipedia.org/wiki/Control_theory Now I need to do it in difference equation form, like the equation in ...
2
votes
2answers
705 views

Effect of parasitic capacitance on an ideal signal?

How does parasitic capacitance affect an ideal signal? Ie. We have an ideal signal shown below, what would it look like with parasitic capacitance accounted for?
2
votes
3answers
601 views

What will happen if I send an analog signal through a digital regenerator?

What will happen if I send an analog signal through a digital regenerator?
5
votes
3answers
646 views

Is there a bidirectional level converter IC for multiple I/O channels?

I have two digital devices to connect, both use 20 data lines but one works at 3.3V and the other at 1.8V, and most of the lines are bidirectional. The operating frequency should be at least 5 MHz. I ...