Recent content by UR_Correct

Holy jeez, I know! He is rather obnoxious.

Aren't they proportional by a square? If you have a 0-5V PWM signal at some frequency, the duty cycle is essentially the percentage of that p-p voltage (e.g., 50% duty cycle gives an effective (I think this is the word. The voltage you see for all practical purposes) voltage of 2.5V, 75% duty...

I always teach kids to use RMS when you're dealing with power because then its P=VI* instead of P=1/2 VI*

Hello all! I am usually lurking and posting around the EE side of physics forums, but I have a project that deals with a little bit of mechanical stuff (please move this thread if I'm in the wrong place), and the mechanical aspect of engineering certainly isn't my forte. To be as superficial...

Thank you so much, vk6kro! This helped a lot, and I appreciate you taking the time to respond. PF FTW!

I've been doing a project with condenser microphones, and I came across a schematic (see attached). I was wondering what some of the components do. I know the 10uF cap across pins 1 and 8 are used to set the gain (just cap makes maximum gain) of the LM386. I was told the 470uF cap is used...

Don't assume Fourier is a beast that can be easily tamed! There is some intense mathematics involved in signal processing!

I don't know if size is a factor, but this site, http://www.trcelectronics.com/12-volt-power-supplies-mid-chassis-1.shtml was helpful when we needed a 12VDC supply with high current for a project. Since you want high power, it's hard to get too small in size, because, like everyone else said...

Hello all! I am about to graduate with a BS in engineering - electrical. For my major, it was required we take an introductory C# course. All I really got out of that was how to use for and while loops and if statements, and a little logic. There were topics on more involved stuff like...

Ahh, fish, I apologize. With the information you gave me, I felt confident that a stepper motor was what I needed. To be more specific, I'm doing a little project on my own for fun. I wanted to try to build a prototype to autotune a guitar string. My system will have a mic pick up the note...

@Schip: Thank you again! Yes, it was a little trouble getting there, but I'm glad I didn't quit like I wanted to. I've actually just been using a guitar to get signals, but when I don't feel like grabbing it, I just whistle with my mouth. Will there be any excess noise with a guitar note...

It's also hard to get zero crossings because my baseline is too noisy. Would this call for a filter? Maybe a low pass filter? I've had only the most basic DSP education. The class was mainly doing math (fourier, s-domain, z-domain transforms)

Thank you! Here is what I have so far. My Vcc is 5V, and I used an op amp and a variable resistor to get the baseline at 2.5V (quiet). I'm using arduino's UNO, so they have nice 10-bit resolution (1024) analog inputs, so I'm getting around 500 as a digital value for quiet. It does jump...

A PWM signal has a frequency and a duty cycle. The frequency is related to how long the period is. The duty cycle is usually a percentage related to the percentage of the period that the signal is on. For instance, a 1kHz, 50% duty cycle, 5V peak to peak (0-5VDC) signal looks like a square...

Hi all, I was wondering how I would go about reading sound frequencies with a controller. Would I need like a microphone and some secondary chip to convert the signal? Any help would be greatly appreciated. EDIT: I probably need a low frequency one, between 50-500 Hz