A chip that sends a signal with more current or voltage, or over longer distances.

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19 views

Current spikes when driving stepper motors

I am trying to figure out appropriate values for a timeout mechanism provided by the DRV8811 stepper motor driver. While doing my research I came across a website that conveniently has a write-up ...
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1answer
21 views

Unified Driver model for low speed and high speed microcontrollers with limited and good memory

I am trying to develop an experimental RTOS. I am stuck in the driver layer design. I want to make the driver layer libraries friendly for the other layers but then again I would like to have high ...
0
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2answers
30 views

When a datasheet specifies output current is it per pin or aggregated for all pins?

When a datasheet specifies something like output current, as with the 74FCT244 or for example, is this referring to the aggregated output current between all pins or the capacity of a single pin ? ...
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1answer
31 views

clock drivers low current consumption

I am trying to drive a 30 pF load cap (1 pF times 30 or 2pF times 15 or so on) from a ring oscillator generated clock. The frequency I want is 250 Mhz. What is the best approach to keep the input ...
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2answers
67 views

How to reduce current

I need help reducing current in my motor driver. The chip is the L293D motor driver with output max 600mA. My stepper motors draw maximum 350mA per phase and operate at 12V, so I am concerned about ...
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1answer
42 views

Fan Control using Motor Driver, looking for suitable solutions

I want to control the speed of a fan (which is a 2-phase brushless DC motor). I am currently using a suitable power supply to run the fans. My source is a Data Acquisition device that outputs up to ...
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0answers
22 views

What motor driver should I use? [closed]

I'm getting 3 of these motors for a holonomic drive system on a robot (probably balancing on a ball). They have a 5A stall current and 300ma free-run at 12V. I'm having trouble finding the right ...
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3answers
60 views

LSM9DS0 driver for MSP430

I am working on a project to interface LSM9DS0 with a MSP430. Looking for a driver in C / C++ that I can use as a reference design.
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1answer
34 views

Turn Stepper Motor Off when Idle

I was wondering if there is a way to cut power to my stepper motor when it is not in use. I dont particularlily need it to hold its position because in my setup it doesnt really need to torque agaisnt ...
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3answers
145 views

Does running parallel circuits for LEDs decrease their output?

Sorry if the questions here are elementary but my electrical knowledge is limited. I am planning to build an aquarium light fixture and I am having trouble grasping how to best use a driver. The ...
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2answers
79 views

Limit drawn current but not voltage (LED driver for 100W LED)

So I have serial connected 8 LiPo's with corresponding controllers to monitor the battery pack. Now, they deliver 32 volts which is precisely what I need but they deliver way to much amperage compared ...
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2answers
57 views

share eletromechanical buzzer between 2 mcu's?

I'm trying to 'share' a buzzer between 2 separate mcu's, one is on a multirotor flight controller (STM32 or Atmega328), the other is a module I'm adding that needs to use the same buzzer. diagram: ...
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0answers
28 views

Designing a motor driver for my robot

I'm new to electronics and i have a task at hand : to design a motor driver board for my turtlebot(an open source robot) . Having said that , im using a johnson gear side shaft motor that draws at max ...
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2answers
114 views

Voltage spikes when driving DC motor with N-channel MOSFET

I'm trying to drive a DC motor (12V, 100W) with MOSFET IRFP054N. PWM frequency is 25 kHz. Here's the schematic: I know DSEI120-12A is not the best diode for this but I don't have any better right ...
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1answer
116 views
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1answer
33 views

Connecting two DC motors on a single driver channel

Is it a good idea to connect two DC motors on a single driver channel? Here are the motor specs: Operating Range: 6 - 12VDC · No load current: 40mA (6VDC) · No load current: 70mA (12VDC) · ...
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1answer
37 views

Per coil vs. per phase current

I'm working on a project using this stepper motor it is rated at 1.5 A/Phase current. Initially I planed of using this driver, so I checked if it can provide enough current for the motor. The website ...
0
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1answer
121 views

How does underdriving a powerful (eg. 50w, 100w) LED chip work?

My question concerns under driving an LED chip. Unlike quality brand chips (Bridgelux, Cree), in my experience, under-driving non-brand ones make things more long lasting and favorable. Using the ...
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0answers
70 views

Supply for autonomous car with sensors and DC motors

I'll be using the Guibot Motorduino for an autonomous car project. This includes L293D motor driver and 7805 voltage regulator. The other components: Multi-Chassis - Tank Version with two DC ...
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2answers
97 views

Why does my 24 volt DC servo motor run at 5 volt DC and not at 24 volt DC?

Why does my 24 volt DC servo motor move with 5 volt DC drawing 5 amps, but does not move with 24 volt DC? The power supply is 24 volt DC up to 10 amps. Datasheet are available for the DS4S servo ...
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0answers
62 views

Stacking DC-DC converters

I'm currently building a high-power LED driver to be powered from a 2.7V supercapacitor. To this end, I'm seeking a solution with high current rating (up to 3A, so ideally a controller IC rather than ...
0
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1answer
63 views

LED Backlight driver output current

Our LCD has 10 series white LEDs for backlight with total Vf of 15V and current of 40ma. The backlight circuit is designed with SC4509. As per the datasheet its recommended output voltage is 20V and ...
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1answer
74 views

Analog/PWM Dimming signal for a LED driver (LIPO battery low-voltage cut-off)

I am using a 4S LIPO-battery and a commercial constant current LED driver to drive a LED setup. Data Sheet for the driver To avoid abusing the LIPO battery, I would like to build a low-battery ...
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0answers
51 views

Design considerations for internal PC parts

I'm designing a PWM fan controller. It will be interally mounted inside a PC and will take power from the normal 4 pin Mate-N-Lock ("molex") connector. The on-board MCU and LCD will draw power from ...
3
votes
6answers
311 views

MOSFET PWM switch jamming on - why?

The circuit presented here is sized to switch 100W at a minimum pulse width matching 250Hz. But actually it's currently only being asked to switch around 10-20W. The load is an array of LEDs. Q1 ...
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1answer
61 views

Comparison of the efficiency of DC motor current limiting / control methods?

I'm using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
1
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1answer
80 views

Driver for triac

Can you explain this schematic: Especially part where are optotriac and triac. I can't understand why if turn on optotriac \ then main triac will be open. Because I made a real scheme and ...
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1answer
31 views

What does shutdown mean for the IR2184

I'm trying to understand & design a circuit using two IR2184 half bridge drivers and some n channel mosfets to create a full H-bridge to control a motor. Reading the datasheet for the IR2184 it ...
2
votes
2answers
193 views

What LED driver IC options do I have to build a two-cell driver for a 3 W LED?

I need a very small and light 3 W flashlight/headlamp for a kind of specific purpose. I want to use two AAA Eneloop cells. In the datasheet there is discharge curve at 1.6 A, so I guess I ...
0
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0answers
50 views

Reference Current for many LED drivers

I am developing a project in which I need to control many LEDs simultaneously. Therefore, I am using many TLC5940PWP LED Drivers (which are driven themselves by small microcontrollers connected by an ...
0
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1answer
113 views

Beaglebone Black PWM Driver for 12VDC 1.05A Motor | Drive from Positive Side

I have several 12VDC 1.05A pumps I am using in my hombrew system which I would like to drive via PWM on my BBB. Each one will have a hall effect flowmeter attached so that I can get flowrates, totals, ...
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0answers
68 views

adjustable current driver for high power LED

I am trying to driver 3 high power RGB LED "Edixeon RGB" I want the current to be able to vary from 0 to 350 mA I am using three classical linear circuit, one for each color, with a current sensor ...
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1answer
207 views

Controlling 90 LEDs using one WS2811

I wanted to build a circuit where i would be able to control 90 LED's using one WS2811 and have a total of 60 WS2811. In this circuit I hope to connect 30 LED's per channel, there is no need for me ...
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1answer
37 views

Output Pin of Burleigh PZ-150 Amplifier Driver Analog High-Voltage Power Supply Unit

I have found a Burleigh PZ-150F Analog Amplifier Driver. However I could not locate the manual. What connector cables are compatible with the output port of this amplifier? It seems there are two male ...
0
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1answer
80 views

Choosing a high-power LED Driver IC [closed]

I need an LED driver to power one (or more) high-power LED(s) for a torch. Design requirements: Efficiency is paramount, since the power source is either a battery or a supercapacitor. Must be able ...
0
votes
1answer
61 views

How does this motor drive circuit work?

The Drive terminals are connected to a PWM signal generated by an arduino micro controller. The purpose of this circuit is to isolate the arduino from the motors to avoid too much current being drawn. ...
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0answers
86 views

Help identifying a voltage regulator

I'm trying to build a portable screen so that I can watch movies around my apartment if I need to move away from my TV screen (think a WiiU gamepad or a tablet). I have many raw components and I think ...
1
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3answers
75 views

Can I get constant current at the output of a buck convertor (to drive a LED)?

I want to drive a LED with a buck converter circuit as shown in the schematic below. In order to keep the circuit simple, the system will run open-loop (i.e.; there won't be any voltage or current ...
0
votes
1answer
115 views

Additional current source for large LED-7-segment-display

I have two sets of LED-7-segs. Each with 4 Digits, all 4 inch tall. One set CC, the other CA. Combined they consume some smooth 1.68A / 1.4A according to the data sheets. That is manifold the ...
4
votes
4answers
841 views

How does a Line Driver actually works?

So I've searched for days for information about the 74HC244 line driver. As always, the Datasheet provides raw and not very good information about the actual component :) (I mean, it gives us the ...
0
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1answer
102 views

Sending Signals over a Coaxial Cable [closed]

Recently I've been trying to understand how multiple signals can travel along a coax cable. Indeed, I have already read "How are multiple signals propagated in a coaxial cable?", but it doesn't seem ...
0
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1answer
105 views

Stepper motor driver differences?

I have recently used a H bridge to control a small stepper motor obtained from a DVD drive and now want to look into controlling something larger, for example large Nema 23 steppers. From reading ...
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2answers
62 views

Usage of WS2821

I got a buck load of WS2821a, and I was wondering, can I use it for something else than driving LEDs? TechSpec: http://www.world-semi.com/uploads/soft/140305/1-140305102109.pdf Can it be used for: ...
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0answers
29 views

Can DRV8837 be used to drive two DC motors in all four ways?

Knowing that some motor drivers do not perform well under low input voltages, I have found that this works well; but how do I drive motors in the following four ways: ...
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0answers
32 views

Driver needed if controlling other devices?

I want to control several other devices with my beaglebone black. Now I was thinking if I need a driver or something else to prevent my beaglebone from getting burned or similar damage. The output ...
0
votes
1answer
182 views

Stepper motor is heating up?

I am using stepper motor for my CNC machine. Its model number is EM284 STP-42D221-01 by Shinani Kenshi. I don't know any specs of this motor; neither voltage rating nor current rating. I don't even ...
0
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1answer
84 views

Two different outputs from same type of IC's

Hello Electrical engineering community. I am using motor drivers to get 5v to 12v and I am controlling each motor with each IC L293D. Each motor driver is controlling each motor and the outputs is ...
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votes
1answer
90 views

How big of CC driver do I need?

I am making a grow light. I have 72 3-watt LEDs on an aluminum sheet. 10 blue 62 red. They are wired in series. How big or how many watts LED driver do I need to power the light? I have 100 watt CC ...
0
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2answers
188 views

What's wrong with this IR2110 pulse transformer driver?

I'm trying to drive two MOSFETs through a pulse transformer. I'm using the "Power Supply Cookbook – Second Edition" book from Marty Brown. According to the book the formula to calculate the number of ...
0
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0answers
70 views

Modifying LED driver

A friend of mine gave me an LED driver that drives 30-36V and 3 amp in the output. Is there any way I can modify that to get 20-22V and 4-4.4 A to power a new LED I got? I live in Argentina, and ...