Recent content by William123

Wow, that's expensive. I think I could motorize regular lever type spool valves for a lot less. That seems to be the only reasonable solution at this point. I have seen some current controlled flow control valves, but they take a long time to adjust so it's not a practical solution for this project.

Hi I'm a novice when it comes to hydraulics but I want to be able to make use of it in future projects. I thought building a small scale excavator might be a fun project to start with. However I'm a bit confused when it comes to the valves that will control the different motions. From what I've...

Hello I came across this video on youtube where a guy was switching a lightbulb on and off with an arduino and a relay (). I was bothered by how he left out the phase wire (look at the image at 4 mins and 53 sec in). People mostly seem to be complaining about how he is breaking the ground...

Really good suggestions. Thanks!

Thanks for the article, I'll read it tomorrow when I have more time. An internship like that must be absolutely golden. I'm moving to Gothenburg this summer to start studying computer science (which is not without some electrical engineering but maybe not so much about AC mains circuits) and...

Sure Yes it is. I've only built low voltage DC driven things before. I'm more on the arduino side of things. I didn't know that the transformer rating determines the chassi material but it makes sense now that I think about it. The transformers I have been looking at are from china (aliexpress...

Hello The Chinese were kind enough to send me a "music mixer" (XH-M164) and apparently these sell for about 8-11 dollars so I thought I might as well build something cool with it. I found an amplifier aliexpress (http://bit.ly/2nTD8VX) and the recommended transformer for that is a 32v 200VA...

You're right. I forgot that the formula gives you the minimum cap value, 1µF should work fine then :) I think I'll just build it as figure 5B shows, but with a L7812 +12V regulator and 1uF caps. What I need is basically this: 2x IR2110's 4x 1uF caps 2x -1N2074A- This one is not on ebay so I'll...

I found a really good pdf that covers a lot about gate drivers and the bootsrap method: http://www.infineon.com/dgdl/an-978.pdf?fileId=5546d462533600a40153559f7cf21200 I'm not sure where to find the values of Icbs (leak) and VMin, which they use to calculate the appropriate capacitance of the...

Hey again Can anyone tell me how to determine exactly what MOSFET driver I need? Let's say I had two IRL7833 on the high side and needed a driver to switch these. The voltage threshold is about 2V and that means that the driver must give it about 24 + 2 = 26V. Or is it not really about the...

Thanks for that pdf! Golden. I don't fully understand the schematic at the end but everything else was clear. It is a little sad that having the skills to make something doesn't pay off The capacitor and gate driver are added to trigger the high side MOSFETs then. I don't know if I want to...

Can't the Arduino control a logic level MOSFET on its own? I could add pull-down resistors and a delay between the forward and reverse state and then just pray that the Arduino doesn't fail. I don't know any other way to do it. Okay, that's clever. I could have used these instead but there are...

I thought I'd give you an update. My Arduino UNO arrived shortly after my last post and I realized that I can use that to read the receiver's PPM signal and convert that into PWM and feed it into an H-bridge to power the motor. So this is where I am now...

Hello I'm trying to radio control a 24V 250W DC motor using Arduino. Instead of buying a real RC ESC I thought I might as well build an H-bridge myself and learn something along the way. I was thinking that I can use some logic level MOSFETs like the IRL7833 or something similar (this one is...

Thank you for linking astroflight again. I found this http://www.astroflight.com/rcpwm2v. Ingenious. These are very cheap on ebay aswell. A cheap solution would be a PWM to constant voltage signal converter and a motor controller that uses a pot. I will look into this tomorrow.