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

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1answer
35 views

Drive stepper motor with audio amplifier?

I am as a beginner in electronics contemplating how to build a motor driver for a stepper motor. From what I have read, the more sophisticated drivers will have a feature known as micro stepping ...
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0answers
40 views

looking for 300mA cree led driver circuit

I need help or need basic circuit of cree LED driver with the following info: Voltage input: 12v Output : 3.3v at 300mA Thanks for any help.
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3answers
46 views

IR LED for night vision LED driver necessary?

I am working on a project that requires a night vision camera. I have a small camera placed on the PCB and 4 IR LEDs placed around it to illuminate the dark room. The rooms are about 20-30qm. I have ...
0
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0answers
18 views

Triggering Problem in 100W LED driver

Why a triggering problem, 100 Watt Driver(volts @ 3ampers), instantly it switches On, but once it is off again it wont switch on.Why does this happens in a led driver. Is this due to capacitors ...
0
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1answer
69 views

Help with building a 3 Phase DC Motor Controller

I'm looking to design the power stage of a 3 Phase DC Motor Controller for use with the Emrax 268 motor. The maximum input battery voltage would be no higher than 300VDC and the maximum continuous ...
0
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0answers
30 views

Building a micro cnc machine

I am building a micro cnc machine, probably from 2 cd roms as the x and y axis and a floppy drive as the z, or 1 hard drive as the x, 1 cd drive as the y and 1 floppy as the z, but I am not sure how I ...
1
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1answer
43 views

5v dc drops to 2v when applied to L293d [duplicate]

I have a 5v dc supply generated from voltage divider and this 5v is used to drive L293d. But the problem is as soon as 5v supply is given to L293d the voltage drops to less than 2v. what could be ...
0
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1answer
46 views

Fail Safe for circuit, when input is removed

I have built a circuit which inverts the signal of a ULN2003A, it is in turn connected to a relay. It is possible for the ULN2003A output to be disconnected from the external circuit as it is remote ...
0
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1answer
67 views

Buck converter not working

I designed a buck converter on breadboard as shown in the picture. I am applying PWM from my microcontroller. I am not sure why this circuit is not working, I have spent so much time on it. Is there ...
2
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2answers
47 views

Inrush Current Booster

I probably need help more with terminology (and thus, how to find the answer that already exists) than with technology. My current hobby project is a low-power device — max current is 100mA at 5V* — ...
0
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1answer
24 views

Zener diode in stepper motor driver with TPL7407L

In TPL7407L's datasheet, there is a stepper motor driver schematic as below There is a zener diode denoted as "optional". However the 'COM' pin is connected to 'VSUP' directly. The 'optional' means ...
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0answers
32 views

driver for 3 x 30 watt leds in series

I am trying to build a lamp using 3 x 30 watt led, a heatsink and hook them up in series to a driver. I have 220 volts outlet (Europe). I am a newbie in electronics Can someone help me choose a right ...
0
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1answer
55 views

Timed Infrared or Infrared PWM Signals

We are trying to have a moving IR receiver pickup a specific IR-led for a range of IR-LEDs. The options we're looking at : Send and unique pwm signal from each different led, the moving object ...
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1answer
50 views

Trying to power a 100-watt Cree Xpe array as efficiently as possible with dimming

I've recently purchased a 100-watt Cree 30-module XPE multichip ...
0
votes
0answers
33 views

Can I connect my Innolux screen to Raspberry Pi 2 using TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout

Setup Raspberry Pi 2 TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout - Without Touch Innolux 5.6 LCM aSi TFT type LCD I am hoping to be able to connect the Pi2 to the Driver using a small HDMI ...
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1answer
51 views

Another DIY Led Question (Complete Newcomer)…sorry

I have 10 Bridgelux leds (forward voltage 3.5 to 4.5v, drawing 750ma max). I also have a 36v Mean Well HLG Driver, offering 1.12a. It seems to me that trying to run all 10 leds (in series) is ...
0
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1answer
47 views

Relay driver circuit with input referenced to positive

I built a standard relay driver circuit as shown in the first schematic here: It works as expected, but I now realized my input is between the positive terminal instead of ground. How can I adjust ...
0
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2answers
106 views

SPI Troubleshooting, Teensy, Arduino, and tri-state

I'm trying to get my SPI bus devices up and running on a custom circuit board that I've soldered together. Unfortunately, I neglected to add probe testing spots on this particular circuit board, and ...
3
votes
1answer
55 views

How to deal with analog pin drivers with output switching?

I'm trying to figure out if there's any way to affordably improve the performance of an analog pin driver that needs to be periodically isolated from its load, for the duration of self-calibration. ...
2
votes
3answers
65 views

Courses about deploying Linux on embedded systems

I am a new grad student in EE and am trying to take full advantage of my time here at the uni. I have always wanted to understand how to get Linux running on embedded platforms, but from the outside ...
0
votes
0answers
14 views

Individual Control of 4 DC Motors with 1 Motor Driver

I am trying to control 4 DC Motors with a position feedback signal, with access to only one of manufacturer's motor control driver boards. Since I don't need simultaneous control over all of them, I ...
0
votes
1answer
44 views

Minimize Current Sensing Loss in LED Driver

Design voltages and currents: Vo = 100V. Iout = 50mA. Po = 5W. R4 is the output current sense resistor. The reference voltage for the error amplifier is 2.5 V which implies that under the target ...
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1answer
61 views

High Power LED connected to Dry battery

I am new to electronics as i love working with circuits. I have 12V 6W SMD LED, which I want to attach with Battery Powered Driver which currently gives me from 10v-14v DC with 50mAmp. Shall I connect ...
1
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0answers
77 views

Discrete logic multiplexer

I posted a more in-depth outline of what I'm doing here, but basically I'm building this circuit (for n=3): The circuit displays an output based on the combination of three three-input DIP ...
0
votes
1answer
78 views

IRF540 power Mosfet 12 volt motor gate resistance

I have a IRF540 power Mosfet driving a 12 volt motor. Currently I am using a 100 ohm gate input resistor, It is working fine. What I want is the maximum gate resistor value that I can use and still ...
6
votes
4answers
578 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 ...
-1
votes
2answers
38 views

How to use Max3795 for driving VCSEL at 100 MHz?

i am trying to drive my OPV380 see datasheet( http://optekinc.com/datasheets/OPV380.pdf) with a square wave data at 100 MHz. i am using now a Max3795 ...
1
vote
1answer
210 views

How to install Altera USB master driver for Windows 8 (64 bit)?

I am trying to connect Altera Stratix 4 board with my PC in which Quartus 11.0 is per-installed. But my PC is not detecting USB JTAG connection from the board. What I am guessing is that, this ...
1
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2answers
153 views

LED glowing when the driver's ground is cut off

I made a simple circuit with a premade LED driver (Recom RCD-24-0.35), analog-dimmed by a MCP4921 DAC, which is controlled by a 3.3V microcontroller board. You can see the schematic below, Q1 is ...
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2answers
114 views

3.1 volt 400 mA laser driver

I've done quite a bit of searching here and on Google, but I think I still need help. Using either of these power supplies: 12V 1A or 5V 2A How can I build a circuit to drive a laser diode with ...
0
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0answers
53 views

Current spikes when driving stepper motors

I am trying to figure out appropriate values for a timeout mechanism provided by the DRV8811 stepper motor driver. While doing my research I came across a website that conveniently has a write-up ...
1
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1answer
39 views

Unified Driver model for low speed and high speed microcontrollers with limited and good memory

I am trying to develop an experimental RTOS. I am stuck in the driver layer design. I want to make the driver layer libraries friendly for the other layers but then again I would like to have high ...
0
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2answers
47 views

When a datasheet specifies output current is it per pin or aggregated for all pins?

When a datasheet specifies something like output current, as with the 74FCT244 or for example, is this referring to the aggregated output current between all pins or the capacity of a single pin ? ...
0
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1answer
32 views

clock drivers low current consumption

I am trying to drive a 30 pF load cap (1 pF times 30 or 2pF times 15 or so on) from a ring oscillator generated clock. The frequency I want is 250 Mhz. What is the best approach to keep the input ...
0
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2answers
135 views

How to reduce current

I need help reducing current in my motor driver. The chip is the L293D motor driver with output max 600mA. My stepper motors draw maximum 350mA per phase and operate at 12V, so I am concerned about ...
0
votes
1answer
70 views

Fan Control using Motor Driver, looking for suitable solutions

I want to control the speed of a fan (which is a 2-phase brushless DC motor). I am currently using a suitable power supply to run the fans. My source is a Data Acquisition device that outputs up to ...
0
votes
3answers
129 views

LSM9DS0 driver for MSP430

I am working on a project to interface LSM9DS0 with a MSP430. Looking for a driver in C / C++ that I can use as a reference design.
0
votes
1answer
36 views

Turn Stepper Motor Off when Idle

I was wondering if there is a way to cut power to my stepper motor when it is not in use. I dont particularlily need it to hold its position because in my setup it doesnt really need to torque agaisnt ...
1
vote
3answers
210 views

Does running parallel circuits for LEDs decrease their output?

Sorry if the questions here are elementary but my electrical knowledge is limited. I am planning to build an aquarium light fixture and I am having trouble grasping how to best use a driver. The ...
1
vote
2answers
175 views

Limit drawn current but not voltage (LED driver for 100W LED)

So I have serial connected 8 LiPo's with corresponding controllers to monitor the battery pack. Now, they deliver 32 volts which is precisely what I need but they deliver way to much amperage compared ...
0
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2answers
83 views

share eletromechanical buzzer between 2 mcu's?

I'm trying to 'share' a buzzer between 2 separate mcu's, one is on a multirotor flight controller (STM32 or Atmega328), the other is a module I'm adding that needs to use the same buzzer. diagram: ...
0
votes
0answers
40 views

Designing a motor driver for my robot

I'm new to electronics and i have a task at hand : to design a motor driver board for my turtlebot(an open source robot) . Having said that , im using a johnson gear side shaft motor that draws at max ...
5
votes
2answers
280 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 ...
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1answer
140 views
0
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1answer
71 views

Connecting two DC motors on a single driver channel

Is it a good idea to connect two DC motors on a single driver channel? Here are the motor specs: Operating Range: 6 - 12VDC · No load current: 40mA (6VDC) · No load current: 70mA (12VDC) · ...
0
votes
1answer
48 views

Per coil vs. per phase current

I'm working on a project using this stepper motor it is rated at 1.5 A/Phase current. Initially I planed of using this driver, so I checked if it can provide enough current for the motor. The website ...
0
votes
1answer
282 views

How does underdriving a powerful (eg. 50w, 100w) LED chip work?

My question concerns under driving an LED chip. Unlike quality brand chips (Bridgelux, Cree), in my experience, under-driving non-brand ones make things more long lasting and favorable. Using the ...
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0answers
85 views

Supply for autonomous car with sensors and DC motors

I'll be using the Guibot Motorduino for an autonomous car project. This includes L293D motor driver and 7805 voltage regulator. The other components: Multi-Chassis - Tank Version with two DC ...
0
votes
2answers
168 views

Why does my 24 volt DC servo motor run at 5 volt DC and not at 24 volt DC?

Why does my 24 volt DC servo motor move with 5 volt DC drawing 5 amps, but does not move with 24 volt DC? The power supply is 24 volt DC up to 10 amps. Datasheet are available for the DS4S servo ...
0
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0answers
65 views

Stacking DC-DC converters

I'm currently building a high-power LED driver to be powered from a 2.7V supercapacitor. To this end, I'm seeking a solution with high current rating (up to 3A, so ideally a controller IC rather than ...