A chip that sends a signal with more current or voltage, or over longer distances.
5
votes
1answer
50 views
Is mVtt the same as mVpp?
I am designing a driver circuit for S/PDIF, and in a couple different places, like this one, it specifies an amplitude of 500 mVtt. I'm not familiar with those units, and googling gives me nothing. ...
0
votes
2answers
62 views
How to drive 32-by-32 (or more) LED matrix?
I have a matrix of 32-by-32 LEDs that I need to control using a driver. The largest driver that I found was a 16-by-16 driver by Linear Technology, and there is no driver that goes higher than ...
2
votes
1answer
59 views
Searching for standalone unix development board to connect DC motors
I though a bit about the board and came to the conclusion that it may be more intelligent to use a stand-alone component which provides serial ports and an unix os which I then can control over the ...
3
votes
0answers
49 views
SPI transaction timeout linux device driver
I am stucked for last 3 days at a point if anyone have any info regarding it then please do share...
I am working on eink device driver with msm8960 qualcomm chipset.
...
3
votes
1answer
70 views
DC Motor driver interfacing problem Atmega32 Board
simulate this circuit – Schematic created using CircuitLab
I want to drive 24V/5A DC motor with Atmega32. So bought motor driver having 24V/20A rating. But i am facing some issues :
...
2
votes
1answer
47 views
Is NRTL approval required for the sub components I purchase and assemble into a final product in order to sell the product in USA?
I manufacture a lighting product made up of components I purchase and then assemble into a housing and heat sinks that my company manufactures. The components I assemble include an electrical driver/ ...
1
vote
1answer
81 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 ...
0
votes
2answers
56 views
USB Lamp, controlled by linux driver
I want to build a simple USB lamp (maybe colored LED lamp) which will be controlled by PC. So, actually, i want to get practice in linux kernel modules development, but i need to get appropriate ...
0
votes
3answers
109 views
Inexpensive programmable RGB LED driver/IC/solution?
My desire is to have a simple setup with a dial device (ideal would be a 3 click dial with 3 distinct settings but an analog dial would also be appropriate) whereby position 1 would display a color ...
3
votes
1answer
128 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
...
1
vote
0answers
38 views
Parallel, low noise motor driver design with L293D [duplicate]
I'm designing a very basic motor driver circuit for 12V DC brushed motors to be connected with my microcontroller. The motor needs to be driven in forward and reverse
My objective is to do that with ...
1
vote
2answers
105 views
Controlling a Servo with a TLC5940 (calculating PWM setting)
I'm trying to control a few servos and a bunch of RGB-LED from an arduino board. To do that I'm going to chain together a few TLC5940 chips. The issue I'm trying to resolve at the moment is what PWM ...
0
votes
1answer
32 views
TLC59116 (Y59116) maximum output current
I bought this IC (http://www.ti.com/lit/ds/symlink/tlc59116.pdf) to power a few RGB leds. I was under the impression that it could drive up to 100ma per channel, constant current. However in practice ...
1
vote
1answer
67 views
Non-inverting version of EL7232? (High-frequencey 3-state DIP driver/buffer)
I'm driving a large number of parallel UART inputs from a single UART output, at 2 Mbit. Currently, I'm driving with a Atmega32u4 using a 70 Ohm current limiting resistor (which in theory would allow ...
4
votes
1answer
163 views
LED driver circuit interfering with 555 timer?
Below is a circuit I put together that uses a 555 timer and an LED Driver:
But the strange thing I see is that the timer does not follow the 1.1*R*C equation. The led remains lit for much longer.
...
1
vote
0answers
89 views
Can I add dimming to a high voltage LED driver
I have an LED panel with 288 LEDs. Two banks of 144 in series. The voltage at the input of each string is 450v and the rated output of the panel is 36W. Currently, there is no dimming capability and I ...
0
votes
1answer
92 views
Questions about connecting a passive infra-red sensor to the USB port
So, we are linking a sensor to a computer via USB, using a female USB connector and male USB wires. The sensor is connected to a circuit with 3 pins, vcc, ground, output signal. If I would want the ...
2
votes
0answers
122 views
How to make your own EL Wire (electroluminescent wire) inverter
I would like to make an EL wire (electroluminescent wire) inverter because I can't seem to find a commercial inverter that can drive the right length of wire from the batteries I would like to use: ...
0
votes
1answer
34 views
Setting up an IBL2403 motor driver
I received an shiny new IBL2403 the other day:
However, I've been having difficultly using the EasyMotion Studio software that comes with it.
When I try and set up the driver for the first time, ...
1
vote
3answers
158 views
L293D Question About Grounding
I am using the L293D to run two motors, and am controlling it via an ATmega328.
I am a bit confused about how grounding works. I was following this tutorial, and searched this question a lot, but am ...
2
votes
2answers
219 views
Choosing a MOSFET for solenoid control via Arduino
I'm trying to drive a solenoid I took off an old pinball machine with an Arduino.
The pinball machine ran on 25 V AC and I've found that the solenoid was 2 Ω online (so 12.5 A). The Arduino puts out 5 ...
1
vote
0answers
116 views
Undervoltage lockout for small-power MOSFET gate driver
I am developing a battery switch-over circuit which is made of two lanes of the depicted circuit. Operation voltage range is from 3V...12V. Only one lane should be enabled at a time which is governed ...
1
vote
1answer
115 views
Efficiently driving 8 low-current Optocouplers
I'm looking to drive a bank of eight FOD4216 random phase triac drivers. I'm looking specifically at the (insanely expensive, $3!) Fairchild FOD4218, which needs 1.3mA to switch. 8 * 1.3 = 10.4 mA ...
5
votes
1answer
169 views
High Side and Low Side MOSFET Driver… with low supply voltage
I need to drive a pair of N channel MOSFETs, one on the high side of the load and one on the low side of a load. Most ICs I can find for this application require 10V+ supply voltage to get the the ...
-4
votes
1answer
69 views
The mosfet driver function in high and low side [closed]
the mosfet gate need high voltage in order to turn on the mosfet as well? What is the different in High and Low side of MOSFET? Why there will having a high and low side ? Is there any affect ?
2
votes
1answer
259 views
What is the function of a MOSFET driver in an H-bridge?
What would happen if I didn't use MOSFET gate a driver, and simply connected the MOSFET gates directly to the logic outputs of a microcontroller? I am quite confused about the need of a MOSFET driver.
...
2
votes
1answer
85 views
Input rated current for easydriver 4.4
I am using easydriver 4.4 to control stepper motor. Easy driver takes input voltage from 7 to 30V. I fed 20V 3.0A to easydriver, but i got it burnt (easydriver)*. Is 3.0A too much for easydriver ? ...
1
vote
1answer
41 views
TLC5926 With No Load
I've read here that running the TLC5940 with no load can cause some issues with it drawing excessive power. The TLC5926 is a constant current driver rather than a PWM driver. It seems to me that since ...
2
votes
1answer
114 views
PWM & NUD4001 LED driver
Today I tried to build a small circuit which basically consists of three NUD4001 LED driver, three n-Channel FETs and a RGB Power LED from SEOUL. I don't have the exact specs ready but the main specs ...
0
votes
1answer
410 views
Arduino Leonardo doesn't get auto-detected in Windows 7 (64bit)
I recently purchased an Arduino Leonardo to control my Sumo robot. I plugged it in to my friends computer and was able to use the Arduino IDE to upload code to the board and run a simple wheel-test ...
20
votes
5answers
824 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 ...
2
votes
1answer
97 views
PWM drivers of Shift registers that are not open drain?
I am need of a 16 channel PWM Serial based LED driver, or serial in – parallel out shiftregister. I had been looking at TLC5940 and TLC59025 respectively.
But for my current set up the ouptuts ...
2
votes
1answer
104 views
How do I know the resistance of a logic level MOSFET transistor?
I have recently gotten into the microcontroller scene, and I have been stumped with a question all day. My microcontroller's GPIO pins cannot handle more than 20ma; I want to connect a MOSFET ...
3
votes
1answer
66 views
What is the fixed-on interval with regards to stepper motors?
I am using a stepper drive board to control a stepper motor. It has settings for for fixed-on time when using the open-loop PWM control method.
According to the API description:
...
4
votes
2answers
119 views
2 different batteries in single circuit
I need to use a SN754410 motor driver with a 4.5V microchip and 12V motor all running on batteries.
I want to power the microchip with 3x1.5v AAA batteries. The motor requires 12V and I want to use a ...
1
vote
2answers
178 views
Developing hardware in FPGA with LED Driver Chip
I asked related TI TLC5944 LED Driver questions here, here and here
Actually initially I was supposed to simulate the following design. I had to simulate the driver functionality also (as the driver ...
1
vote
2answers
344 views
Use Raspberry Pi Gpio Header as Memory Mapped Interface
Raspberry Pi is really an interesting device for its support of so many features in such a small and simple formfactor. If the GPIO expansion header can be accessed in the same way as a normal ...
26
votes
1answer
921 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? ...
2
votes
3answers
142 views
Drive Fight on 7400 Series
I'm currently designing a 7400 series circuit to drive LEDs from a set of shift registers (74595). Each shift register's tri-state input is wired to the output of a 2:4 decoder (74139), and the ...
4
votes
3answers
193 views
Why are the pins on the official arduino motor shield so long?
Here is the Official Motor sheild website.
The shield has pin connectors at the bottom that are 2x longer than on any other shield I've seen. Why is that?
2
votes
4answers
922 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 ...
0
votes
2answers
115 views
Low Frequency, High Voltage Oscillator
I am trying to create a speed control for a brushless AC motor, like those used in fountain water pumps. Since the speed of the motor is determined by the line frequency I want to make a low ...
3
votes
1answer
383 views
Why is my constant current source (LED driver) pulsing?
I bought a current source to try to power some high brightness LEDs. The LEDs take 350mA so I found a current source on digikey that matches that and ordered it:
...
1
vote
1answer
183 views
Half Bridge Controller not working
Please be gentle, as I am a bit of a noob when it comes to these things.
I am attempting to use an IRS2186 to control 2x IRF3205s in a half bridge configuration (datasheets below). I am using a known ...
1
vote
1answer
136 views
High voltage H-bridge diode
i'm designing a varable-frequency drive with 2 H-bridges based on IR2108 half-bridge drivers. I want it to drive a 220v single-phase motor. Reading the datasheet i got a little confused on choosing ...
0
votes
1answer
473 views
How to use a SN75441 h-bridge in conjunction with an arduino
I am trying to use a SN75441 h-bridge in conjunction with an arduino in order to drive a DC motor forward and backward. Let me describe the setup and then the problem I am encountering.
I have an ...
3
votes
1answer
191 views
Driving servos using microcontroller and current limiting
I am new to electronics and would like to design a PCB that uses an Atmel microcontroller, and powers three servos. I was thinking of designing the PCB with a single power supply.
The servos I have ...
2
votes
1answer
189 views
BLDC Motor Driver Losses
That was a pdf when originally uploaded, but am now going to try to zoom in on the sub-circuits. Please let me know if there's a better way to do this.
I'm trying to make a PIC-based BLDC motor ...
6
votes
3answers
535 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 ...
0
votes
2answers
214 views
Reading from SPI flash more than 35 bytes causes driver timeout and results to corrupt
I have connected SPI flash to my linux board (imx 233 based) running in it's SPI bus.
I have configured kernel, and SPI bus and flash chip to it.
The flash is currently on a breadboard. Before ...
