Recent content by jla2125

Thanks for the help! I got it all figured out pretty quickly after that. If anyone's interested, here's how I did it programmatically: given circle's center points c1 and c2, and circle's radii r1 and r2: d_x = c_2_x - c_1_x d_y = c_2_y - c_1_y d_a = d_x^{2} * d_y^{2} a = ({r_1{}}^{2} -...

No freakin' way! I can't believe I didn't see that before! That circle trick's pretty neat. Now, about that algebra: which two equations do I need to solve to get the points? are you referring to the last two? Also, the last equation has a variable I haven't seen elsewhere: (y_2). What is...

Homework Statement So, it's my understanding that there must exist a line which is tangent to a given circle and intersects a given point in 2D space. I'm trying to find that line. Any form will do, but I'm currently aiming for the coordinates of the two points: the intersection point, and the...

Electronic Supply sites make me cry :( (A switch-related question) Ok so I've been going through Newark's site, trying my darnedest to find a tactile switch that A: does what I want, and B: has plastic switch caps of some kind that fit. To address item A, I need a tactile button that is...

There seems to be this kind of rather small zone of speed where it just generates really colorful patterns, and that's what I'm trying to go after.

I'm not sure I'm following you. Are you talking about connecting the pulse from a 555 timer to the motor itself? It's a 3-phase motor, so there's nowhere to connect that. It's driven by the LB11885 chip.

Yeah, my goal is to generally wreck havoc on the image, as opposed to slow it down. But, am I going about using the pot in the right way?

Hey, thanks for the reply! This helps a lot! Just to verify, when wiring up the pot, the edge pins (1 and 3) would go to ground and pin 43 respectivly, and the middle wiper pin would go to pin 32, correct? As for tricking the VCR, I only need to slow it down slightly. The VCR that I'm using...

I'm not trying to slow the tape down, but rather the read drum itself. Pin 32 of the LB11885 chip is the drum speed control pin, the description of which is as follows: "Control is the constant current control to which current return is applied from DRS." DRS isn't explained anywhere else in...

I'm trying to modify a VCR so that the big drum that scans the tape spins slower (for an art project...). It's a brushless DC motor that uses a special VCR-specific IC to control it, I believe. The chip is a sanyo LB11885 (http://www.semiconductor-sanyo.com/ds_e/EN7884A_d.pdf" datasheet). VCR...

will that form work for just about anything? IE: given: 1 = x1, 50 = x2, 182 = y1, 455 = y2: f(n) = x1 + (x2 - 1)*(n - y1)/(y2 - y1)

Hey! I have a really easy question here, but I still can't figure it out. I have a range of values from 182 to 455. I need a function that gives me back values from 1-50. IE, f(318) = 25. The numbers aren't critical, but I'd love a general equation to use for this kinda stuff. Can anybody...

Wow, thanks for all the help! I wasn't expecting such fast and knowledgeable replies! I just wish I could return the favor with more scientific knowledge :P So with my new understanding of my power supply, I've measured the following: 7 24V Tubes: 3.05A total 9 17V Tubes: 4.20A total 5 12V...

So, if I have 3 tubes, and two of them are rated for 0.6A and the other is 0.3A, I shouldn't put them in the same circuit?

If the heaters of those tubes are only 600 and 150mA respectively, why do they peg my power supply's current output meter? Is this because the supply gives them 12vdc, instead of 12vac? Or, if I current limit them, will the filaments still light up, so long as I give them time to warm up...