HP printer won't power up

Started by W. eWatson in sci.electronics.basics7 years ago 4 replies

The printer has a power plug that goes into the printer. There are three female sockets recessed in the plug. I would guess the center one is...

The printer has a power plug that goes into the printer. There are three female sockets recessed in the plug. I would guess the center one is ground. pin 1 to 3 is 32v dc pin 2 to 3 is 30v dc pin 1 to 2 is 2v dc A LED on the adapter is growing green. Does this seem normal? Is there a way to diagnose otherwise?


why are stepper motors so hard to turn?

Started by Anonymous in sci.electronics.basics4 years ago 16 replies

I took apart an old inkjet printer and was surprised the stepper motor has such resistance to it, if it's just an iron gear rotor. What gives?

I took apart an old inkjet printer and was surprised the stepper motor has such resistance to it, if it's just an iron gear rotor. What gives?


USB-to-Serial ??

Started by Jim Thompson in sci.electronics.basics8 years ago 12 replies

Further cleaning up in the office found an odd cable... USB on one end, what looks to be serial on the other?? Was there such a thing. My...

Further cleaning up in the office found an odd cable... USB on one end, what looks to be serial on the other?? Was there such a thing. My cable collection was sort of hilarious, I don't know why I kept some things for so long... I must have tossed 20# of parallel port printer cables ;-) ...Jim Thompson -- | James E.Thompson, CTO ...


OT: Print to TEXT File

Started by Jim Thompson in sci.electronics.basics8 years ago 17 replies

Is there a program around that is actually capable of "printing" to a text file? The Wimpows Generic/Text "printer" mostly results in a...

Is there a program around that is actually capable of "printing" to a text file? The Wimpows Generic/Text "printer" mostly results in a garbage file. Mainly what I'm after is something that can "print" a text-mostly web page into a text file. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innov...


Arduino choices

Started by Ivan Vegvary in sci.electronics.basics8 years ago 23 replies

Want to buy an Arduino. Too many choices that I don't understand. Prices = all seem to be nearly the same. Arduino will be used by a small...

Want to buy an Arduino. Too many choices that I don't understand. Prices = all seem to be nearly the same. Arduino will be used by a small group of high school students to build a "p= ick and place" robotics arm. School has a 3D printer and a laser cutter. = We also have lots of motors and servos from VEX robotics kits. We could us= e the VEX controllers but I would like the students t...


Fresnel lens?

Started by AK in sci.electronics.basics1 year ago 7 replies

I am trying to maximize the amount of light that a red laser produces when it hits a cadmium photo cell. I went from a photocell with a small...

I am trying to maximize the amount of light that a red laser produces when it hits a cadmium photo cell. I went from a photocell with a small area to one with about double the area. I salvaged this from a laser printer and was wondering if that clear thing is a fresnel lens? [IMG]http://i64.tinypic.com/29w0bwi.jpg[/IMG] Am also trying to figure what that clear led is.? There is a ...