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  1. D

    Portugal says hello!

    Well, as requested by hakzaw1 I'm reviving the welcome post so people know that I am somewhat back!!! After 5 years I will hopefully finish my High current / Low voltage DC-DC "PSU" and share with you all! Hooray! :D
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    808nm "lethal" supply

    Hello everyone! Well, I know, this post is oooolddddd, but I decided to make a huge return, first of all, I am really sorry for the delay (well... It's been a few years! > hey in he beggining I told it could take 4 to 5 years! Kinda nailed it!) but I just wanted to tell you that this project...
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    808nm "lethal" supply

    Well thanks for the tip! Anyway, even if this isn't the right resistor value you just pointed me the right place to look for! I tought they were more expensive but it seems not..! :) Anyway, before I buy those, I'll use what I have. Only yesterday I've realized that I only need 10, about 5 per...
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    808nm "lethal" supply

    Ok, after a while struggling with my "prusita" (prusa + mourita) :wave: yay! on wich I did some improvisations with some alluminium profiles I've had here for a while (that I've used for the former co2 laser cutter), I've finally bought the parts needed for this project. Well.. some resistors...
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    808nm "lethal" supply

    Hello guys! I know I've been away for a while but, now that I've got a new job things became a little harder to do, also there is another thing that is taking my time. Finally my 3D printer project is "almost" over, I can print parts and I've been dedicating my time to it, I know it's a...
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    808nm "lethal" supply

    If this is not the "final" it is almost there... a tweak here, a tweak there... :)
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    808nm "lethal" supply

    Hello there! It's nice to see so many constructive critics, well, I don't have much time since I've got a new job (hurray!). I will first start by saying that my baby is already waiting for me in the Post Office... my friend needed my signature so I couldn't pick it up today, anyway, also my...
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    808nm "lethal" supply

    Leodahsan I'm @ Portugal..! Lisboa..! =)
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    808nm "lethal" supply

    Well here it is updated, I'm messing around with the TTL part trying to figure out a few things first. Anyway, the circuit seems pretty stable I tried to create a zener diode voltage reference but that seemed to eat up my current once I started the circuit, I didn't want to move R4 so I decided...
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    808nm "lethal" supply

    Hey there! Well, I have followed your advice and now I have a nice and clean 1.33v on the opAmp drive side. I have added a zener diode to reference the voltage and then use the pot to regulate the current by using that voltage as reference, the Vg at the FET dropped to about 7.34 volts wich is...
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    808nm "lethal" supply

    Ok, after fiddeling a little bit more with the circuit this is how I've got it to work properly and without having insane voltages over the FET. I've added C2 to allow the circuit to "ramp up" the circuit (by slowly increasing or decreasing Vg at FET) untill the laser is fed to the desired...
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    808nm "lethal" supply

    Hum... I have used this FET because of the current it can handle, it can handle about 100A @ 40v, the Vg min is 2V and Vg max is about 20v. The way to solve the "voltage issue" on Vgate is by probably adjusting R4 and R3, I'll give it a try, I'm hoping not to sacrifice too much current, if...
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    808nm "lethal" supply

    Well... you were right, those were Voltage Followers -.- . After reading a bit more I came up with this circuit, in simulation it works a charm. (ISIS Proteus 8) I wouldn't call it final, since I will need an oscilloscope to checkout the wave-forms coming into the load input, this is supposed...
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    808nm "lethal" supply

    Hey guys, what do you think of this one, note that I've used the same circuit but with a different approach, the sense resistor is R4, if I place the load Before Q2*the*circuit*won't*be*ok. Am*I*going*a*better*way...
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    808nm "lethal" supply

    Hi all, and thanks for all these responses wich I'll obviously take into account! I will try to answer everyone at my best, here goes! Well, the main purpose of this project is to create an oxygen assisted XYZ plotter to cut sheet metal and other materials, I've always been a sucker for...
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    Portugal says hello!

    Will do and still I am! :) Currently studying drivers and power supplies... Let's see where this goes to..!
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    808nm "lethal" supply

    Hey there, my first post into trying to show something productive!! :) Well, I've recently purchased a bar diode, it has about 60W peak power, don't worry, until my safety glasses arrive I will only blow up a few load resistors trying to build this "thing" aka PSU to power it. :drool: The idea...
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    Portugal says hello!

    Thanks Greenlander! "Ora obrigado!! :) Folgo em saber que há malta portuguesa por aqui!" - Trans: "Well thanks, I'm glad to know there is portuguese people around here!" Well, fresh as meat I am! :D Yes, I'm near Lisbon and the epicenter was somewhere near Algarve a few months ago, bad luck...
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    Portugal says hello!

    Hello, My name is Ricardo, I live in Portugal (that little square on Western Europe that looks like a face (for those who are terrible at geography)) :), this is my second post though, but I've never really wrote anything useful here. Well, like I've mentioned on the other post (about linear...
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    How laser diode drivers work; An Explanatory Thread

    Hello, My name is Ricardo and this is essentially my first post! So, hello to all and I hope I can learn a little more! I've read a lot meanwhile, but this post got a lot of my attention and just "got me confidant" to dig into the laser world a little more. :) I have owned a water-cooled 40W...




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