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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2answers
339 views

Is it a mistake in AD725 and other datasheets?

During my research of the RGB video and encoders I see two ways chip manufacturers/circuit designers treating the outputs (several examples below): AD725 (Analog devices): capacitor then resistor ...
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1answer
41 views

CC driver led project

I have a lot of (new) LED light strips from a job I was on. These light strips were in 2x4 fixtures. As a project I would like to use these as undercabinet lights. But the CC driver that comes with ...
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34 views

Bad headphone driver resistance

I have a pair of ATH-M50 headphones where the right side has stopped working. I took them apart and measured the resistance at the L/R terminals on each driver. The good one measures about 35 ohms ...
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2answers
140 views

What's the voltage transfer characteristic of this power driver circuit?

[Exam problem for an instrumentation course] Can anyone help me understand how this circuit works? I'm not too familiar with power circuits... This somewhat reminds of a BJT class B amplifier (but ...
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2answers
221 views

TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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63 views

Triac Driver Datasheet - LED Trigger Current

Looking at the datasheet for MOC30xx (here: http://www.farnell.com/datasheets/1806097.pdf) I see the following note on p4 under the table outlining the respective LED Trigger Currents of the various ...
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1answer
77 views

VNH5019 Motor Driver reverse polarity protection

So I managed to fry one of these drivers. It was rather simple - It was end of the day, and I plugged the power supply in reverse polarity (24V), and it blew up. Now, I wondered - How come there is ...
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2answers
285 views

Is it possible to get a floating power supply to power multiple MOSFETs

Hey guys this is my first post on stack exchange so please go easy on me! I have a hobby project where I was trying to make a few batteries go in series using a micro controller and a floating power ...
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1answer
44 views

GAN FET gate current requirement

I'm looking for advice in making sure the FET driver I've chosen is capable of driving the FETs I've chosen with turn on time as low as possible. I'm going to use the LMG1210 and EPC2020 with 12V ...
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0answers
168 views

HIP4086 Driver Failing After Connecting to BLDC Motor

Update: A Renesas Tech pointed me to the documentation for the HIP4080, which is basically a two leg version of the HIP4086, but with much more thorough documentation. I now have three working ...
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3answers
490 views

Incorrect operation of the Allegro A3941 driver

I use the Allegro A3941 driver in these modes: At very low duty cycle (<10%)PWM motor consumes 0.05 A and produces a squeak. If you increase the PWM duty cycle of the PWM to 10% the squeak ...
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1answer
532 views

Where to begin with programming an audio interface driver?

I'm designing my own mic/line preamp (the analog portions) and would like to have it interface with a computer in a send-return fashion as well (like any typical audio interface). I've noticed that ...
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1answer
1k views

When do you need buffers/drivers on buses in a microprocessor design?

I was browsing Microprocessor Interfacing Techniques and found this pharagraph: The microprocessor's buses must connect to every memory and peripheral input-output chip in a system. All MOS ...
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3answers
527 views

Mosfet Driver - High Side Output Problem

I've been trying to make a 3 phase inverter to drive a BLDC motor. Mosfets : IRF3205 Driver : IR2101 Supply voltage for FETs and drivers : 12V BLDC : https://media.digikey.com/pdf/Data%20Sheets/...
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1answer
64 views

driver for IR led board

I'm installing a cheap IR led board like this. Do they need any kind of driver? Or just a 12V power supply switched with a relay (to power on/off) If so, is there any kind of consideration I need ...
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1answer
393 views

Push-pull output stage and driving circuit function

simulate this circuit – Schematic created using CircuitLab Hello, what is the exact purpose of the C3 and C4 capacitors, two diodes and R3 and R4 resistors in this circuit used to drive the ...
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1answer
100 views

Multiple power supply potentials

I am making a Project with an Arduino driving a stepper motor with a driver board. USB will still be connected to send commands over serial. EDIT: I am building an EggBot driver board for my Arduino ...
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0answers
35 views

Need to find out one “a-Si TFTLCD” driver

I need to work with one 5" TFT LCD working with STM32 MCU, So I find out one 5 inch TFT LCD wich in seller website don't have written anything about isn't the driver. The LCD specification in web ...
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0answers
64 views

stepper motor driver heats up

I have this motor driver design set up on a breadboard for a bipolar stepper motor. I was able to drive the motor forwards and backwards for about 5 minutes. I realized that two of the P mosfets were ...
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2answers
177 views

Turning off the LM3914 dot/bar display driver per the datasheet

I'm designing a circuit with an LM3914 dot/bar display driver and want to shut off the entire bank of LEDs based on conditions in the circuit. I'm having some difficulty turning off the driver from ...
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0answers
75 views

Is it possible to drive a capacitive touch screen work as a touch simulator? [duplicate]

I want to simulate a finger touch/move/etc. on capactive touch screen. Obviously using a robot arm and stylus pen is a solution, but it was expansive and the structure was too complex. It would be ...
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1answer
169 views

Driving a motor backwards and forwards using mosfet and Arduino pin safety

So I want to drive a motor from a handheld drill/screwdriver. And I have managed to get it going using the first schematics, and using pwm to control the speed. The Zener diode is there to protect ...
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1answer
520 views

Driving a butterfly package DFB laser

I want to drive a DFB laser in a type-2, 14-pin butterfly package. The manufacturer has provided limited information on how to bias the laser diode and could not get any information on the reference ...
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1answer
93 views

Mystery Diode in Schematic - MPQ8039 HALF BRIDGE DRIVER

The below image shows four example schematics for the the MPQ8039 Half Bridge Driver. Three of the four examples show a diode connected between the DRV pin (Gate Drive Supply Bypass) and the BS pin (...
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1answer
469 views

How does torque control work in three phase motors?

For a project I am working with a three-phase AC brushless motor, connected to a motor driver. The driver allows digital control over the motor in position, velocity or torque modes. Below are a few ...
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1answer
52 views

Need to know the binary lower bit change impact in circuit

for example if i need 99 decimal number need on output, and ima giving binary digit of 01100011 in Nexperia part and iam replacing that part with Texas part, what is the effect on the circuit can u ...
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2answers
350 views

Drive a resistive heater from a low power IC

I'd like to drive a resistive heater using an IC operating at 3.3 V. The heater may need to dissipate up to 18 W, and will be powered by a 28.8 V battery. The IC is able to generate PWM signals, but ...
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1answer
201 views

Why do my servos break?

I'm messing around with some servos and one by one they stop working. I've got a Raspberry Pi to which I connected a pca9685 servo driver board which in turn connects to 3 of these cheap servos. I ...
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1answer
65 views

RS485 Rx signal connected with two drivers

I wonder why is RS485_Rx is connected with two line drivers while RS485_Tx is connected with only one line driver. Is this some mistake in the schematics or is it some standard circuit for RS485?
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2answers
206 views

MAX232 vs TRS202EC Line Drivers

I have used MAX232 as UART serial line driver using 5V power supply. Now I have come across TRS202 chip in a circuit. It also run with 5V power supply. Does this chip has some special difference or is ...
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1answer
98 views

Error Amplifier Gain

I was studying the "SG3525" IC and its functions, and I encountered this issue: In the "Error Amplifier" section of the Datasheet, there is a parameter that named "DC trans-conductance" which it is "...
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2answers
292 views

Is it appropriate to use the TB6621 or DRV8871 motor driver for powering 12V 1 amp motors?

I'm looking to make an Arduino powered rock crawler with 4 motors (want independent control of each wheel, also need to reverse). I'm looking into buying 12V DC motors that seem to have about a 1A ...
2
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1answer
68 views

J-Link programmer in Windows 8 don't work

I use the J-Link programmer in Windows 8. A few days ago, my programmer hanged and the LEDs stayed silent, and I, with the help of the Internet, was again using the SAM-BA software to install the ...
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1answer
367 views

Trying to increase amperage of Arduino Uno digital pin (20mA) to control a cabinet lock that is rated at 12v / 2A

I am trying to use my Arduino Uno to send power from one of its digital pins to a cabinet lock, the cabinet lock is "fail-secure," so you send power to it to unlock ...
0
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1answer
159 views

eeprom driver code c++ overlapping

im trying to write driver for EEPROM (24LC64): page size: 32 byte capacity: 8KB (64Kbit) definition code: ...
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1answer
46 views

Transforming a supply power [closed]

For a recent project i need to power a certain element with .7 amps and 5 volts. my input power is 5 volts, but i need to calculate a circuit for decreasing current. I looked for answers on google and ...
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1answer
655 views

USB Device that acts like a printer [closed]

Our client uses some third party software and devices for their internal work. They print 600 pages per shift and now they wanted to eliminate paper usage without changing their existing systems. ...
5
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1answer
820 views

Does a MAX485 need decoupling capacitors?

I am designing a small device with two MAX485 chips. Do they need the decoupling capacitors on the 5V power?
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2answers
1k views

What register or setting can control the brightness of an ST7735 based 1.8" TFT Display?

I'm using a KMR-1.8" display which uses a ST7735 driver and it is working ok with the Adafruit_ST7735 library. The problem is the display is very dim once the library has initialized. If I reset ...
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0answers
74 views

Do I really need motor drivers for a quadcopter? [duplicate]

I am planning to build a quadcopter, so I searched about motor drivers, then I thought "Do I really need a motor driver?", I mean the only thing I want to control is the motors' speeds, so won't ...
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1answer
89 views

How to change ferrite core of transformer

we want to replace EE20x10x6 ferrite core to FED 25 to reduce height of transformer.This is for LED driver ,we have all data for EE20x10x6 means turns for input,output,and auxiliary winding with ...
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2answers
509 views

How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
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1answer
1k views

Potentiometer min and max value

I purchased several of these to drive high power LEDs on a custom project : https://www.amazon.com/gp/product/B019W4C5IE/ref=ppx_od_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 These LEDs are to be ...
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2answers
75 views

What is an example of driver and receiver chips for a PCB?

I am watching some tutorials on signal integrity and the instructor keeps referring to a driver and a receiver. I am a little confused what exactly this would be when designing a PCB is the driver ...
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1answer
82 views

Can a power surge have a different effect on a led driver when floating?

I have a LED driver which has 3 connections on the AC side , L,N and ground. In the event of power surge, can there be a difference in effect if the GND connection of the LED driver is floating or ...
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2answers
2k views

Driving a 4-wire Hard Drive Motor

After reading many contradictory accounts of the "proper" method, I would like to clear it up: what is the correct method for driving a 4-wire, star configuration hard drive motor? What I have ...
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1answer
384 views

Driving MOSFET with 5V PWM for 12V fan speed control

I came up with this circuit to control a 12V 6A fan's speed, with a 5V PWM from another circuit. I'm not sure if it's going to work (I'm not very experienced nor knowledgeable in electronics) and I ...
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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 ...
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0answers
47 views

Not All I/O Pins Work for Nixie Driver on Arduino MEGA and ATMEGA1284PU

I am tearing my hair out, and help would be immensely appreciated. I am developing a nixie RPN calculator. I am using nixies being driven by K155ID1 nixie drivers, connected to an ATMEGA1284PU. I ...
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1answer
2k views

What methods exist to introduce dead-time in a MOSFET H-bridge? [closed]

What methods exist to introduce dead-time in a MOSFET H-bridge? (to prevent shoot-through) (other than software methods, or using MOSFET driver ICs with internal dead-time generators)

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