Recent content by sherrellbc

I was using the sense of the line to determine the position vector, as you mentioned. I know that DB is not a vector, but if you normalize DB and then multiply the resulting vector by the magnitude of the F along that cable then you effectively have deduced the components of the force. My...

I am consistently getting this wrong. To me, in the picture below, it would make sense that the structure would be pulling downward, and the cable BD would be pulling upward - thus the system is in equilibrium. However, the solution to this problem show the force being applied downward...

Thank you, I have actually been looking for something like this.

What? That equation must be used in conjunction with the internal resistance of the winding. I was speaking only of the inductance at this point but later elaborate with respect to the series resistance. The equation is wholly valid regardless of a DC or AC application. In DC, the current...

I understand what an H-Bridge does, but your comment was vague with regards to what should not be turned on at the same time. I know that, in its more basic form, an H-bridge gives two paths of conduction to run a motor bi-directionally depending on which set of transistors is on.

What are you referring to here? What should not be turned on at the same time? Are you referring to the two transistors through which current is conducted to drive the motor? Where might I find documentation regarding what you are describing here (level conversion/shifting .. and?) ?

Assuming we are talking about a basic configuration like this: Voltage across a coil is: L*di/dt It seems that, even when turning, the current is constant and the voltage would be zero across the coil. Consequentially, the entire voltage that exists across the motor would be a proportional...

Well, sure but I did not mean it like that. I was just implying that the motor is 3V max and I was running it a bit under that as to not push its limits. Perhaps I should have used better phrasing. What do you mean by "driver voltage level conversion."? It seems that the AND gates, when both...

The datasheet defines Vih as "input high voltage" which appears to be the threshold by which after this voltage the AND gates shown in the schematic above will register as "HIGH." What does the logic for an AND gate have to do with transistor biasing and voltage drop across them? Also I am a...

The datasheet defines Vih as "input high voltage" which appears to be the threshold by which after this voltage the AND gates shown in the schematic above will register as "HIGH." Where do you find that Vs = Vih + 2.5V ? Also I am a bit rusty on my transistors, what does Vce(sat) represent...

How do these LEDs conduct ? With this board: the associated schematic is: P1 (with pins 1 and 2) represents a motor. OUT1 and OUT2 are the conduction paths. LEDs L2 and L1 will illuminate depending on which way the H-Bridge is conducting. My question is how are is that the...

So, I have been long struggling with getting a L298 motor driver I have to work. I figured it to be more compact than wiring up all the protective diodes myself so I purchased this: Where the board simply supplies a regulator, protection diodes, and a filter capacitor. Anyway, I have gotten...

As far as I know a short circuit is a short circuit regardless of situation. That being said, the supply would definitely be shorted - although the damage would be a function of its protective circuitry.

I was going to suggest this very same thing. In general a great way to multiplex.

At the very bottom of the wiki page on flyback diodes there is a derivation of the current in the circuit diagram that is the first image in my original post. Where is shows that the voltage across the inductor is the voltage across the diode and resistor.