Recent Topics

Switches and 12v regulated psus

by LayZ1307

I'm wanting to purchase either :
12v 3a switches or
12v 5a switches (more expensive same thing)

To replace something similar to this :

Power switch -1 pc (rated 250V 1A, for mounting hole 13x19mm)

The fact that his power switch is rated 1a makes no sense to me. Does this mean my 3a switch model could replace this switch in the same build? Or should I stick with 5a like the psu will be rated? (I have 5a and 30a psus both of which I want to switch on and off).

ToyREP Power Supply Cover
by thorgal
View Comment

Lab Power Supply

by Kanata

I have made a variable voltage power supply from an old computer atx, but as I am doing more precision electronics projects, I would Like to buy a Lab power supply.
I would like to spend about $100 - $150.
I would appreciate any advice before I buy one.

View Comment

Smoothieboard - static resets the printer

by CVMichael

I posted on the smoothieware forum, but the forum is not very active, and I am not getting any answers. So I thought to try it here.
The problem I have is that static electricity resets the Smoothieboard. So once I start printing I am afraid to touch the printer because there is a chance it might reset. This did not happen before with previous boards I used (Arduino, and RE-ARM that I used to have on the same printer). My printer is a custom build 400mm cube print area, T-Slot aluminum frame, and I have the ground wire attached to the aluminum frame.
Do I have to attach the ground to the Smoothieboard? how to fix this?

View Comment

Quick question about a step down 12Vdc-5Vdc converter

by butch82

Hi all, first post here.
I bought the step down converter you can see in the picture. I am trying to power my raspberry pi 2, although while I can correctly operate a fan connected with 2 DuPont connectors, when I connect the usb cable I can't get power from it.
To make my usb cable I dissected one I had laying around (which actually worker) and connected the two wires in it (it was for charging only, not data transfer) to the output pins of stepdown. I also tried to switch them to see if polarity was wrong but no way.
Of course I am experimenting with an old phone I had laying here, not with the actual raspberry, so it is safe by now.

What am I doing wrong ?

Raspberry_Pi Stepdown_Module usb
View Comment

3D Printer: Can a RAMPS 1.4 + Arduino run a RepRap SCARA?

by Bajicoy

Hi, building a RepRap SCARA from scratch, I have the mechanics down but I'm not so sure about electronics before I purchase them. Any help would be appreciated! (Or let me know if this is the wrong group to be asking this, no worries). Listed my anticipated hardware and you can answer any number of my questions, just link the number you're answering down below.

12V30A power supply + RAMPS 1.4 + Arduino Mega 2560 + 4 DRV8825 stepper drivers + ESP 8826 Wifi module, all for $40, if any of you have any alternatives to help me on a budget, feel free to let me know, I just want to be sure I'm not going to burn my house down when I start wiring fans and motors to it.

  1. I want to wire three 12V Fans on this printer, 1 V6 clone for the extruder and two radial cooling fans for the hot end. Diagrams online seem to show the RAMPS only has two 12V slots so I was wondering if I could directly wire the V6 clone fan to the power supply, seen it done on the FolgerTech i3 2020 but stop me if the smaller fans on clones can't handle this, the seller doesn't give a voltage so I am assuming what it is since it's an industry standard.

  2. Also, could I wire both of the radial cooling fans to the D09 slot rather than put one at D09 and the other behind the poly fuses? I just like the idea of controlling both of them from a single output and lets me put the V6 clone behind the poly fuses rather than directly to the power supply.

  3. Would four 2A Nema 17 stepper motors kill the printer? They're beefier than the usual 0.4A motors and I can get these stronger ones cheaper. Picked the DRV8825's specifically to handle current but I don't know how to do the math, 8A for motors + 12A for the heated bed + ??A for the hot end + 3 Fans + Wifi + etc, it makes me worry I should buy the more expensive 0.4A motors and sacrifice the good deal on a stronger printer.

  4. Could I plug a 32 Bit Arduino in as an upgrade later on or should I just get one and ignore the 2560? I don't want to buy something expensive and experimental for a baseline prototype either to burn it out or find out it can't be used. I will certainly look to upgrade the electronics down the road but that probably will be months after the start of the project.

Thank you for answering any of these questions! Feel free to shoot me any questions if I didn't provide enough information.

View Comment