I'm filtering a 1020Hz 3.3V squarewave from a microprosessor using a 2 pole low pass butterworth filter. Thanks to TI for their filter pro! I would like the output frequency of filter to be a 1020Hz sine wave. I realize that if I select the cutoff frequency at 1020Hz that my sine wave will be...
Hi,
I'm designing a circuit that will take a square wave generated by a microprocessor and feeds it through a bandpass filter to get a sine wave. The application will be to provide a tone for morse code to a handheld ham radio on board a small satellite. Right now im considering remaining...
Hi, I'm working on a dust repulsion circuit that requires >3000VAC at about 5Hz. I know that there are florescent light bulb power supplies that go from 12DC to 1kV-->7kV. These are perfect except the output frequency is around 30kHz. I really need the 5Hz part. Any ideas? I would prefer...
Hi,
I'm looking for an easy to use and good debugging compiler for the MSP430 microproccessor. Price is not a key factor compared to the ease of use and usefulness of the libraries. Any recommendations?
Thank you in advance!
Windell
Hi, I've designed a pressure bottle that houses some electronics for an underwater robot. Although I predict that the electronics will remain sufficiently cool without much forced convection, I would like to install a 4" 12VDC computer fan inside the bottle to circulate the air. The fan would...
Hi, My goal is to fill a 50mil gap between a heatsink and instrument so that the gap is less thermally resistant. I've come up with two options. 1)use two thin thermally conductive pads with a piece of 6061 aluminum in the middle and 2)use a thick thermal pad. I've calculated the equivalent...
I'm trying to launch CFDesign from ProE. However, it is not listed on the applications list. Do any of you know how I could get CFDesign as part of that list?
Thank you very much!
Hi, I'm writing a program in C that creates a simple model of the forces within a tow cable being pulled through the ocean by a ship. In my force analysis I have three non-linear equations with three unknows. To solve for these unknowns I would like to use the Newton-Raphson method. I've found a...
Hi, I'm attempting to write as simple program to analyze the forces acting on a tow cable that is being pulled through the water by a ship. To serve as a very simple model, I want to assume that the ship is not moving up and down and the motion is in a single direction (only 2D motion, no...
Hi, I'm poting some UV LEDs in clear epoxy in which will be submerged in seawater. The UV LEDs will shine through the clear surface of the epoxy to prevent bacteria growth on the epoxy surface.
I would like to know the rate at which UV light is absorbed in the epoxy before it exits the epoxy...
Hi, I'm trying to determine if it would be more efficient to build an LED array out of "white" light emmiting LEDs or use Red, Green, and Blue LEDs to make white light. Assume that I already know about the different voltage drops of the different colored LEDs and that I have a solution for that...
Aloha, I'm searching for a liquid or oil that has an index of refraction close to the index of refraction of air. I'm not sure if this is possible. I know that highly pressure tolerant cameras exist today for underwater applications, but they are rather costly. I would like to keep costs down by...
I'm searching for a circuit that would turn on the LEDs in an LED array one at a time. For example, if the LEDs were lined up in a line, the LEDs would light up from left to right or right to left or whatever the order may be. It would be nice if circuit allowed it so that the lighting speed...
Aloha,
I've been working with Boston Gear to find a right angle shaft non-backdriveable worm gear reducer. The best choice they have to offer is a two stage worm gear reducer that weighs 28lbs. The first stage has a worm lead angle of 8.47deg and the second stage has a lead angle of 14.23deg...
Aloha,
I would like to use an simple optocoupler to pull a pin to ground on a stepper motor driver. I have little electronics experience and I heard that there might be a need for pull up or pull down resistors when using an optocoupler.
Question 1:
I'm looking for simple typical application...
Aloha,
I'm using a microprocessor to send TTL step and direction signals to a motor driver. The max current that the microprocessor can drive is about 6mA. The motor driver's step and direction inputs draw 16mA of current through its step and direction pins.
It is obvious that I cannot send...
Hi,
I'm trying to find a motor that has a brake. When the motor is energized I would like the brake to disengage. When no power is provided to the motor, I would like the brake to engage. Basically I need a motor that brakes when no power is offered to it.
I would prefer the motor to be a...
Do any of you have experience using 6 lead UNIPOLAR steppers with a gecko drive?
The manual doesnt really say is the gecko drive is for bipolar or unipolar motors. The following is an excerpt from the manual.
"4-wire, 6-wire and 8-wire motor may be used. When 6-wire motors are used, they may...
Aloha,
I'm think about purchasing two unipolar steppers from EAD motors. Where can I purchase a simple power supply that provides at least 24 volts and can supply over 6 amps of current for two steppers.
Mahalo Nui Loa,
Windell
