Quotethe_digital_dentist Some automotive relays have shunt rectifiers built in- if the relay has a polarity marking that may be why. Check the relay's spec sheet. Just checked it, no rectifiers or polarity markings, just a common mech relay. Quotethe_digital_dentist I'd probably look for a diode that's intended to be used as a rectifier in a power supply, not a small signal switching diode lby mato84 - Reprappers
I read the post, but it only talks about a solid state relay, I have an automotive relay, which, if I understand correctly, needs a diode to protect the board from emf spikes from the relay´s coil, which leads me back to the original question of this post.by mato84 - Reprappers
That´s right, I meant a 7805 regulator (those three legged thingies look all the same to me ). So, do I increase the voltage on the psu, and see if the volt. regulator can take it? maybe adding a heatsink?by mato84 - Reprappers
Well, yes indeed, I´m using a Mk2b dual power, and also, I´m using a piece of cork under the bed, and a piece of cork on top while I wait for the thing to heat up, which, again, takes it´s time to do so. I´ts interesting what you are saying about turning up the voltage. I do have a chinese led psu, and I tuned it to 12v. The thing is, a while ago my voltage regulator on my arduino blew up becauseby mato84 - Reprappers
Well, I´ve checked the voltages with a multimeter, and it´s 12v or so pretty much everywhere, with the bed hot and cold. It´s taking around 40 min to get to 95c.by mato84 - Reprappers
With all the noise the printer makes, I don´t mind the clicking very much. What do you mean I don´t need the diode?by mato84 - Reprappers
So yeah, the title says pretty much everything... I was thinking of speeding up my heatbed heating time and I read that a relay is the way to go. I happen to have a 12v 30a car relay and a 1n4148 diode in my spare box, and I wanted to use it as a flyback diode. Btw, I have a ramps 1.4 and a 12v 30 amp psu. Thanks a lot!!by mato84 - Reprappers
Yes! Absolutely sure. As a matter of fact I recall leaving the z endstop wires connected to the ramps board, and only unplugging the molex connector that goes to the endstop pcb board. I´ll attach a couple of images of the endstop. However, since my symptoms match what you are describing, is there anyway to test the 5v regulator on the arduino and finding out if indeed it was a miswired endstop?by mato84 - RAMPS Electronics
So...a weird thing happened to me the other day, I was printing a new z axis endstop support (my endstops are the ones mounted in a pcb board, the ones with three wires.), everything is plugged in normally, then, when homing the z axis, and as soon as the endstop clicked, everything shuts down, and the printer disconnected from repetier. My first thought was that I probably plugged the wrong z enby mato84 - RAMPS Electronics