Questions tagged [driver]

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

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59 votes
5 answers
21k 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 ...
Phil Frost's user avatar
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24 votes
4 answers
37k 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 ...
Mehrdad Kamelzadeh's user avatar
7 votes
2 answers
24k 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?
gomek's user avatar
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53 votes
2 answers
16k 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]. ...
Chris's user avatar
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3 votes
4 answers
22k 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 ...
Peter Clyde's user avatar
28 votes
4 answers
51k views

What is the purpose of "MOSFET driver" ICs

There are dedicated "MOSFET driver" ICs available (ICL7667, Max622/626, TD340, IXD*404.) Some also control IGBTs. What is the practical purpose of these? Is it all about maximizing the ...
6 votes
3 answers
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 ...
user17100's user avatar
5 votes
4 answers
29k 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 ...
Mehrdad Kamelzadeh's user avatar
3 votes
4 answers
18k 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 ...
Matt Cashatt's user avatar
1 vote
2 answers
2k views

Is it necessary to use a pull down resistor with this BTS7960?

I have an Arduino Nano controlling a BTS7960 that is 10 meters away. I have one 24V power supply. Both the Arduino and the BTS7960 get 5V through a an LM2596 step down converter. The BTS7960 "...
Snaier's user avatar
  • 11
16 votes
2 answers
11k 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 ...
Phil Frost's user avatar
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2 votes
1 answer
9k 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 ...
Microsoft Linux TM's user avatar
11 votes
2 answers
17k 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 ...
rrazd's user avatar
  • 1,677
9 votes
5 answers
15k 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. ...
Maciek Sawicki's user avatar
6 votes
2 answers
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 ...
Frank's user avatar
  • 2,842
5 votes
1 answer
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 ...
angaran's user avatar
  • 163
5 votes
1 answer
4k 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 ...
amin's user avatar
  • 53
4 votes
4 answers
14k 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. ...
Max's user avatar
  • 547
4 votes
1 answer
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-...
Ned64's user avatar
  • 143
3 votes
4 answers
34k 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....
Robert's user avatar
  • 113
3 votes
2 answers
13k 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 ...
andre_lamothe's user avatar
3 votes
1 answer
1k views

Driving MOSFET from MCU with BJT

1- What is the purpose of D1 in this circuit? 2- Can i connect the PWM output of MCU to Vi through a diode, to protect the MCU from 12V supply of the drive circuit? (e.g. if Vi got accidentally ...
Microsoft Linux TM's user avatar
2 votes
2 answers
4k 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 ...
Dumbo's user avatar
  • 3,274
1 vote
1 answer
626 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 ...
Luna's user avatar
  • 41
0 votes
1 answer
377 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 ...
Yogi12's user avatar
  • 75
30 votes
6 answers
65k 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?
tuupola's user avatar
  • 1,657
15 votes
4 answers
9k views

Help wanted with vacuum fluorescent display (VFD)

In a box with old components I found a 16 character, 19-segment 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 ...
stevenvh's user avatar
  • 146k
14 votes
5 answers
21k 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 ...
Anindo Ghosh's user avatar
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13 votes
3 answers
12k 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 now....
Simon G.'s user avatar
  • 231
10 votes
5 answers
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-...
BarsMonster's user avatar
  • 3,307
9 votes
4 answers
10k 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 ...
samoz's user avatar
  • 1,181
8 votes
2 answers
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 ...
PICyourBrain's user avatar
  • 3,715
8 votes
1 answer
5k 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 ...
TRISAbits's user avatar
  • 1,368
8 votes
3 answers
17k 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 For these high powered LEDs, how ...
Mike's user avatar
  • 593
8 votes
4 answers
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 ...
Peter Clyde's user avatar
7 votes
1 answer
3k 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 ...
Microsoft Linux TM's user avatar
6 votes
4 answers
22k views

How to interpret the stepper motor voltage requirement?

I have a 8HS11-0204S stepper motor and need to match a driver to it. HERE it says that the recommended voltage for driving it is 12-24V. But if you open the (feeble) DATASHEET, it says that the rated ...
I have no idea what I'm doing's user avatar
6 votes
4 answers
3k views

Multiplexing a Circuit

Frankly, I'm overwhelmed with this circuit that I have to start building in lab tomorrow. Last week we built an octal decoder that takes a 3-bit binary input from 000 to 111 and displays a unique ...
JGill's user avatar
  • 75
6 votes
1 answer
717 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 ...
angelatlarge's user avatar
  • 3,621
5 votes
1 answer
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. ...
user51166's user avatar
  • 860
4 votes
3 answers
470 views

MOSFET driver blows out in half-bridge DC motor PWM controller

EDIT: I've redone the MOSFET circuit diagram; it now represents what my actual layout is. I wanted to spare myself redrawing the circuit but ended up confusing everything, I hope it's clearer now! ...
Solmyr999's user avatar
  • 149
4 votes
5 answers
454 views

Relay coil fast demagnetisation

In the past few days, I've encountered an application note on the Maxim Integrated website about rapid demagnetisation of an inductive load: https://www.maximintegrated.com/en/design/technical-...
Kamal Moussafir's user avatar
4 votes
3 answers
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 ...
Alexis K's user avatar
  • 2,719
4 votes
3 answers
24k views

How to use N-channel MOSFET as high side switch (non-buck switching)

I have an application with some constraints for which it feels difficult to find a solution. load current more than 10A, so N channel MOSFET is preferred; working voltage is a bit high, between 50-...
Spark's user avatar
  • 41
3 votes
1 answer
797 views

Suppression diode for relays in ULN2803A

I want to make a simple 8 chanel relay multiplexer. My choice for driver IC at the moment is ULN2803A and for relays it is a 12v DC DPST relay. I read in ULN2803A datasheet that it contains ...
Dumbo's user avatar
  • 3,274
3 votes
2 answers
2k views

Motor drivers and kickback diodes

I am considering buying one of the hbridge drivers referenced in the below tutorial, but when I looked at the comments underneath the second hbridges sparkfun page, kickback diodes were referenced and ...
a sandwhich's user avatar
3 votes
2 answers
2k views

Flyback transformer - ambiguous schematics and other issues

I'm currently using this schematic for a flyback transformer: (source: eleccircuit.com) As you can see, there's a big problem - neither the schematic, nor the website describing it, give the value ...
Alex Freeman's user avatar
3 votes
3 answers
4k views

MOSFET Driver Failure

I'm having trouble with TC4421A MOSFET drivers in a new PWM DC Heater design blowing. The 12V power supply used during testing is capable of 25A. While doing my initial testing, I started off with ...
MotoDan's user avatar
  • 61
3 votes
4 answers
22k 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 ...
Paul's user avatar
  • 777
3 votes
1 answer
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 ...
chi_n_me's user avatar