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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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 ...
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4
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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 ...
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2
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Motor driver using only a 2N2222 transistor?
Is it possible to build a motor driver using only a 2N2222 transistor?
If yes, then how?
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2
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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]. ...
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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 ...
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4
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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
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3
answers
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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 ...
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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
4
answers
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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 ...
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2
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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 ...
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votes
1
answer
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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 ...
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2
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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 "...
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11
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2
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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 ...
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5
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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.
...
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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 ...
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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 ...
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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 ...
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1
answer
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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-...
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4
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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. ...
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2
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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 ...
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4
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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....
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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 ...
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1
answer
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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 ...
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votes
1
answer
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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 ...
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6
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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?
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4
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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 ...
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5
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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 ...
- 50.2k
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3
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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....
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5
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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-...
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4
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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 ...
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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 ...
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1
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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 ...
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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 ...
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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 ...
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1
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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
1
answer
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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
...
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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 ...
6
votes
4
answers
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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 ...
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votes
1
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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.
...
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5
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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-...
4
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3
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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!
...
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3
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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 ...
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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-...
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votes
1
answer
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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 ...
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2
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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 ...
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2
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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 ...
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votes
1
answer
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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 ...
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4
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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 ...
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3
votes
1
answer
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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 ...
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3
votes
3
answers
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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 ...
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