Questions tagged [driver]

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

Filter by
Sorted by
Tagged with
146
votes
4answers
70k views

How can I efficiently drive an LED?

I understand that I can not connect an LED directly to a battery because it will draw too much current. Thus, there must be something else in the circuit to limit the current. What options are there? ...
56
votes
5answers
19k views

Why would one drive LEDs with a common emitter?

I've seen tutorials aimed at beginners suggest the way to drive an LED from something without enough current drive is this: (option A) but why not this: (option B) Option B seems to have some ...
22
votes
4answers
31k views

How diodes protect H-bridge DC motor driver?

I don't really understand how these diodes in this circuit and similar circuits (like driving a relay circuit) protects the controller circuit from the energy stored by the inductance of the coil. I ...
7
votes
2answers
22k views

Motor driver using only a 2N2222 transistor?

Is it possible to build a motor driver using only a 2N2222 transistor? If yes, then how?
49
votes
2answers
13k views

Why are USB devices slower than 480 MBit/s

Motivation With a signaling rate of 480 MBit/s USB 2.0 devices should be able to transmit data with up to 60 MB/s. However today's devices seem to be limited to 30-42 MB/s while reading [Wiki:USB]. ...
3
votes
4answers
20k views

Voltage Controlled Current Source integrated circuit? Exists?

Does anyone know of a Voltage Controlled Current Source IC? Or do you know how I can build one with as few other components as possible taking up a minimal amount of space? current range needed is ...
26
votes
4answers
43k views

What is the purpose of “MOSFET driver” IC's

There are dedicated "MOSFET driver" IC's available (ICL7667, Max622/626, TD340, IXD*404). Some also control IGBTs. What is the practical purpose of these? Is it all about maximizing the switching ...
6
votes
3answers
10k views

Best way to control 130 - 140 LEDS with Arduino Uno 32/64 bit led drivers?

I am new to electronic prototyping and had a few questions. I need to control 132 LEDs individually. I want to make 3 rows ( 2 rows of 60 and 1 row of 12) I think i can matrix them but i would still ...
4
votes
4answers
28k views

Build an H-Bridge Motor Driver with 4 N-Channel MOSFET

I have bought 4 N-Channel MOSFETs to build an H-Bridge Motor Driver. My Motor drive and my power supply voltage is 12v. My TTL logic voltage is 5v as I want to speed up/down the motor with uC PWM. Now ...
3
votes
4answers
16k views

How can I drive 12v LEDs from my Arduino Nano?

Background I am building a scale RC helicopter and ordered a bunch of 3mm LEDs to give it some nice navigation and strobe lights which I plan to drive with an Arduino Nano. Problem is that I goofed ...
14
votes
2answers
10k views

What is MOSFET gate drive capability and why do I care about it?

Someone told me that this circuit has "poor gate drive capability": simulate this circuit – Schematic created using CircuitLab What exactly does that mean? I tested it with an LED as a load ...
8
votes
2answers
14k views

Totem Pole Output Driver

I was wondering if someone could explain what a totem-pole output driver is? I have seen the term mentioned in connection to the inner circuitry of an AND gate (consisting of transistors) and in ...
3
votes
4answers
26k views

How to decrease the motor Speed without losing the maximum Torque

I am using MDS40A motor driver(http://www.cytron.com.my/viewProduct.php?pcode=MDS40A&name=SmartDrive40) to drive a power window motor (12V, brushed motor) similar to the one at (http://www.cytron....
6
votes
2answers
3k views

Laser driver circuit

I like to build a laser pointer driver circuit that I can drive from an 8 bit uC. However, I like to get light output fairly constant. This requires for me to look at the photo detector (these lasers ...
4
votes
1answer
3k views

how to control constant current led driver output with pwm?

i want to control brightness of led series with constant current power supply. but when i connect the power supply output to pwm controller and led series, i cant control the brightness because power ...
4
votes
4answers
4k views

Driving relay directly from optocoupler, what is best?

I'm designing a smart socket using an ESP-32 and a mechanical relay that can drive 5A at 240VAC. Following typical relay driving circuits, I would like to use an optocoupler between the MCU and relay. ...
4
votes
1answer
2k views

How do I find out which current/voltage to use for an unlabelled LED panel?

I have a 600mm x 600mm LED panel with 576pcs 3014-type SMD LEDs in some unknown configuration/topology (edge-lit, similar to this one here: http://i01.i.aliimg.com/wsphoto/v0/1990066259_5/Wholesale-...
3
votes
2answers
11k views

Weird ULN2003 to 7-segment behaviour in Proteus

I'm trying to drive a 7-segment common anode, in the following connection, however there is no output the comes from the ULN2003 at all, its like when it gets a 0 in the input, it gives a tri state ...
9
votes
5answers
14k views

Best way to control 75 LEDs with Arduino

I need to control 25 groups of 3 LEDs or 25 RGB LEDs. Each group will be dismissed from the uC by up to 20 cm (about 8 inches). 20 cm is very safe assumption but I think it will be 10 cm or less. ...
5
votes
1answer
1k views

Is it possible to run a stepper motor only with a L293D at reduced current?

I would like to drive my stepper motor (1.4A rated current, 3.5V, 2,5 Ohm coil resistance). I only own some L293D drivers but I think I will burn it if I just wire the motor to the driver without some ...
2
votes
2answers
3k views

Need advice on microcontroller to switch relay on/off

I am trying to connect an OMRON G2RL-2A DPST 12 VDC relay (G2RL relay datasheet) to my PICAXE 20x2 microcontroller. I also have a ULN2803A relay driver (ULN2803A datasheet). I managed to get the ...
1
vote
1answer
317 views

MCU 3.3v to 5v Relay Driver, MOSFET or BJT

I couldn't find a definitive answer. What's more suitable to drive a 5v relay from a 3.3v MCU, a MOSFET or a BJT Transistor? NPN or PNP? I will be using a Schottky SS34 as flyback diode. Relay ...
0
votes
1answer
295 views

Basic circuit voltage question - Using a driver to control a stepper motor

I'm pretty new to electronics. I'm using an Adafruit ESP8266 microcontroller connected to a L293D motor driver to power a bipolar stepper motor. I'm struggling to understand the various voltage levels ...
14
votes
5answers
19k views

Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?

My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency. The question: What ...
19
votes
3answers
36k views

Is it possible to drive a stepper motor greater than 1000 rpm?

How could I achieve this? What are the stepper motor facts and principless that I have to keep in mind to design a circuit to achive this goal? Are there any readymade/open source alternatives and ...
29
votes
6answers
64k views

How to drive brushless motor with Arduino?

Is it possible to drive a brushless motor directly with Arduino? Or should I revert on controlling a brushless motor ESC with PWM pulses?
8
votes
4answers
9k views

How can I effectively drive multiple LEDs with multiplexing?

I am interfacing my microcontroller (AVRmega32U4) to a 4x4 LED array. There are 2 control lines to operate columns (passed to a 2 to 4 demultiplexer) and 4 control lines to operate rows. I bring a ...
13
votes
4answers
8k views

Help wanted with Vacuum Fluorescent Display (VFD)

In a box with old components I found a 16 character, 19-segments Futaba VFD: I would like to use it for "something" but I haven't the foggiest how to drive such a display. Even the filament is an ...
8
votes
4answers
11k views

Adjustable linear led driver? Linear, not PWM

I'm working on a product that requires an led to output currents varrying from 0mA to 350mA and as many possible levels in between (~1000 would be sufficient I suppose). I CANT output a PWM signal to ...
8
votes
1answer
4k views

High Current Pulse on LED

According to Cree Inc Pulsed Over-Current Driving of Cree® XLamp® LEDs app note, driving LEDs with high current pulses can be performed as long as the following guidelines are respected: Based on ...
3
votes
1answer
5k views

I²C bus buffer vs extender P82B715 vs. P82B96

while searching for a way to use the I²C bus for distances about 5m I found these 2 chips P82B715 and P82B96. I'm wondering which one I should use (I know this is up to me). So my question is which ...
10
votes
5answers
3k views

PWM & output voltage

while 555 contest is long gone, I am still debugging my device, where I already abandoned 555 itself :-) At the moment, I am driving PC fan from an PWM (30kHz) signal from atmel uC. I am powering P-...
7
votes
1answer
2k views

Is turning off MOSFET too fast, bad?

As far as i understand turning off a MOSFET too fast, is bad, as high drain-source dv/dt can cause ringing through: a) biasing Parasitic NPN and: b) charging the GS capacitor through DG capacitor, and ...
6
votes
3answers
16k views

How to drive high powered LEDs as efficiently as possible

I have come across some very high powered LEDs. Datasheet for LEDs http://www.cree.com/led-components-and-modules/products/xlamp/arrays-nondirectional/xlamp-cxa2011 My question is: for these high ...
4
votes
3answers
7k views

BJT, resistor, and diode work but ULN2803 does not

I am trying to control some 5V relays with a mC. At first I went with using a BJT, a 470 ohm resistor, and a 1N4004 diode to control each one of the relays. Each mC output pin is 5V, 40ma. This ...
3
votes
4answers
19k views

Can I drive a low voltage stepper motor with an A4988 driver?

I have this stepper motor with the following specs: Model: 17HS4417 Rated voltage: 2.55V Rated current: 1.7A Phase resistance: 1.5 ohms Phase inductance: 2.8Mh Holding torque (min): 40N-cm. Detent ...
3
votes
1answer
1k views

Is there a standard for writing device drivers for microcontrollers?

I have written device drivers for microcontrollers using AUTOSAR. But I was interested in knowing if there are other standards for device drivers. I am planning to write for TIVA TM4C123GH6PM. It has ...
2
votes
2answers
804 views

Square Wave Voltage Level Shifting

I have a square wave signal of 300 KHz which is 0.2 V to 1 V. It is the output of FP5138 Non-Sync PWM Controller IC. I want to drive a PMOS with this square wave but with the levels shifted to (Vin-12)...
2
votes
1answer
3k views

Why does turning a MOSFET ON too fast cause ringing?

Going though app notes, I can understand that turning it off (i.e. when drain-source voltage is increasing) can cause ringing due to parasitic NPN and also drain-gate capacitor which can charge the ...
1
vote
4answers
14k views

How to convert a digital signal from 5V to 24V?

I have an industrial application where I have to interface a microcontroller output which gives a digital signal (0V to 5V) on its outputs and I want this signal to control a relay which takes (0V to ...
8
votes
2answers
4k views

Unipolar and Bipolar Stepper motors

I would like to universal stepper motor driver circuit. Is it possible for one circuit to be able to drive unipolar and bipolar motors with only a firmware change or do they require much different ...
6
votes
1answer
675 views

Higher current LED driver for persistence of vision display

Project needs We need an inexpensive LED driver IC that: Can source or sink at least 15mA/LED Has an SPI-like interface (not I2C) Has a separate latch pin Has at least 256 grayscale intensities ...
5
votes
1answer
4k views

Power MOSFETs and Gate drivers

I'm trying to finally apply what I learned at university in the course of power electronics. However I find that both that course and most of the books / online references are lacking on some points. ...
2
votes
2answers
566 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 ...
1
vote
3answers
2k views

Problems driving leds with the MM5450

First what is my final goal: to drive 24 RGB LEDS using a microcontroller connected serially to a Micrel MM5450 LED driver. It would be nice to be able to drive all of them individually (72 LEDs), but ...
1
vote
1answer
1k views

Question about laser driver

If you go to this link you see a nice laser driver for a small laser...didn't he mean to put that diode in series with the + and - or is it supposed to be parallel and I"m just not understanding for ...
1
vote
1answer
240 views

What's the purpose of diode between high side and low side supply voltage of IR2110?

What's the purpose of the diode between VCC and VB?
1
vote
2answers
971 views

Galvanic separation between a microcontroller and a motor driver

Is it possible to achieve galvanic separation between a microcontroller and this driver . It's a dual full bridge driver and I'm going to parallel it's outputs (consequently the inputs and the sense ...
0
votes
1answer
2k views

Square Wave Voltage Level Shifting (Take 2)

After my question before, I tried to design a circuit with zener diodes and transistors for this issue. It seems to work in simulation. Am I overdoing it? Are there any other simpler ways to do this, ...
0
votes
3answers
2k 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 ...