Re: Dual extrusion TB6560 controller
To me that's one of the hidden advantages of a "real" fuse. You don't get into the cycling process. You also get a much better ability to interrupt a dead short (high current fault). The question...
View ArticleRe: MendelMax 1.5: No power to Arduino when RAMPS is connected
Take a look at the SD card adapter. Make sure there are no blobs of solder between pins. Double check where you were plugging the adapter in. It's very easy to get moved over one pin the wrong way on...
View ArticleLooking To Buy DIY Reprap Kits : Hadron Ord bot or others.
Hello, I am new to the board and find this place very helpful. I wanted to issue a request for Hadron Ord bot Kits or others. Looking for ramps1.4withlcd etc. End stops/wireless/mechanical. Stepper...
View ArticleRe: Ramps 1.4 Arduino Mega 2560 Scripting software
I too am having issues with the coding part. The Marlin software that i use was corrupted by me accidentally when I first got it. Then I uploaded the correct script for the prontface software I am...
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
Thank you very much. Your suggestions are welcome. Technical specifications, schematic and software details have been added to the documentation of the campaign. Take a look
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
Thanks for putting up the schematic !!! One thing I notice - you do not have a diode in series with the +5V 7805 regulator input. If you power the board from USB, and have no voltage on the +12, the...
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
I do wonder why a lot more boards aren’t using the Atmel AT90USB1286, the Native USB interface is very appealing
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
Hi folks, thanks for the very good comments that you have all made. I did consider putting an input protection diode but in this case I am relying on the diode within the the lm7805, the input diode...
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
The USB transfer rates are incredible with this device. You can transfer gcode files to the uSD card reasonably quick to make it a useful feature. As opposed to going through the FTDI USB serial...
View Articledesign firing circuit for thyristor
The supply is 220v 50Hz ac.I need 80V DC output voltage .For this i need to fire the thyristor at 80 degree.The main problem is to fire the thyristor at 60 degree .please sugest me the firing circuit....
View ArticleGen 7 board, AVR 1.5 board, steppers not turning/working
Hello, I just had an issue with the MCP 2200 which got resolved(needed to update Win XP sp2 to Win XP sp3). I can upload firmware and monitor everything well. The issue i have is following: after...
View ArticleRe: Dual extrusion TB6560 controller
But then the question comes to my mind: why would you use 12V anyways? If I change the whole board to 24Volt, what needs to be changed? The 7805 can handle 24V, and fans can run on 5V?
View ArticleRe: How many Nema17's could an A4988 run?
With higher voltage driving the motors you could also wire them in series. You might get a bit less speed but total torque would be better. Or some combination of series and parallel.
View ArticleRe: Dual extrusion TB6560 controller
I'm reconsidering the fuses and reverse protection diodes on my design. It seems to me that with polyfuse the reverse protection diode on the heater output will burn out and burn the board long before...
View ArticleRe: Dual extrusion TB6560 controller
In my humble opinion the diodes are not working as reverse protection diodes. I'll take the diodes out, for they only cost money and don't provide any extra functionality. 12 Amp car fuses are hard to...
View ArticleRe: RAMPS for Due!
Quick update... I have been massively busy with work so not a great deal of progress. The hardware is still working ok, at least no smoke. :) I am waiting on a board from Geetech to see what they are...
View ArticleRe: Dual extrusion TB6560 controller
There are several things that get called reverse protection diodes. One is the diode that protects the 7805 from an un-powered supply line. That one very much does do it's job. Leave it out and the...
View ArticleRe: RAMPS for Due!
Oh, I've fixed the inverted heaters problem in APrinter. I don't think there's anything now preventing it from running on a real RAMPS-FD. @bobc If you find some time could you give APrinter a test on...
View ArticleRe: How many Nema17's could an A4988 run?
Series wired motors can (but may not) get you into some interesting damping issues. I'd stick with parallel wired stepper motors.
View ArticleRe: design firing circuit for thyristor
If you fire the SCR at 80 degrees on a normal sine wave you will get everything *greater* than 80V rather than everything less. The normal approach is to trigger a one shot with the zero cross of the...
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