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

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3answers
384 views

Light LED light?

I would like to mount 10 or 20 white LED on a thin rod, about 2 m long - and around 3 mm in diameter. I will need to accept various compromises for conflicting requirements, but I try to understand ...
0
votes
1answer
76 views

why my LEDs burned with the right driver?

I am trying to connect, in parallel, 18 LEDs that have these specs: LED size: 10mm; Voltage: 3.2V - 3.4V; Current: 20mA. Driver Type/Model: MeanWell LPC-20-350 (datasheet: ...
0
votes
0answers
22 views

Multiplexing Stepper motors [on hold]

I am looking to reduce costs on a current design that has 16 controller boards and 32 drivers. I have 32 NEMA 17-sized hybrid stepper motors that I need to control in groups of four. I.e. send a ...
0
votes
1answer
46 views

Arduino LED Cube 8x8x8 with a Led Driver (TLC5940NT )

Me and a group of friends need to make a college project and decided to do a LED cube that can graph mathematical functions. We do not know how to code very well, and are very new to Electrical ...
0
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2answers
29 views

Hi Drive MOSFET waveform for charge controller

I have designed a charge controller using the BQ24650 IC from Texas Instruments. Although I am outputting the correct voltage, the hi drive waveform is not the square-shaped waveform I was expecting. ...
1
vote
1answer
48 views

Drive 8 Stepper motor simultaneous with different motion?

I have the need to drive 8 stepper motor together and with different motion behavior for each. Could I just get away with 8 stepper control board (easy driver) + an Arduino with enough pin to get the ...
0
votes
1answer
24 views

Loading new drivers

Suppose I'd like to make changes to the drivers of ADXL345 for SPI by building on https://github.com/analogdevicesinc/no-OS/tree/master/drivers/ADXL345 How should the updated drivers be loaded? Should ...
0
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3answers
82 views

Op-Amp based guitar direct box

I successfully built an active DI box using this circuit (image posted below), everything went fine and I'm happy of the result. Parts List ...
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1answer
102 views

BLDC motor waveforms

I'm trying to drive a brushless motor (BLDC) with an ATMEGA328p I use Timer0/1/2 to generate 3 different PWMs @ 62Khz. First I tried (only absolute values) $$A = \sin(T)$$ $$B = \sin\left(T + ...
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2answers
82 views

Led's in series light power degradation with strange results

I am doing life cycle test for 7 led's connected in series with current limiting resistor.(picture for reference) I am measuring light power(mW) with Thorlabs photo resistor for each led. Led's ...
0
votes
1answer
41 views

Transistor based relay driver for DC motor is not working with 12V-8A DC motor?

I am trying to run a 12V-8A DC motor from pic microcontroller output pin via relays(28V-30A output rating). It only starts for a split second and stops. Where as small DC motor runs perfectly on the ...
1
vote
1answer
62 views

Why is this a bad MOSFET/Driver for a Tesla Coil, what does one look for in a good one?

MOSFET: http://ixdev.ixys.com/DataSheet/99175.pdf Driver: http://www.irf.com/product-info/datasheets/data/ir2183.pdf What factors should one consider in selecting a good MOSFET/Driver combo, and ...
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0answers
18 views

H-Bridge driver misfiring and referenced to >VCOM?

Circuit below. Circuit is a full-bridge with IR2183 drivers being operated at 12V. Measurements were taken with reference to GND at JC2. Hey, take a look at this stuff, HIGH SIDE IN RED, LOW SIDE IN ...
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vote
1answer
60 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 ...
0
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0answers
65 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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votes
3answers
53 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
20 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
votes
1answer
91 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 ...
1
vote
1answer
51 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
votes
1answer
57 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
votes
1answer
80 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
votes
2answers
54 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
votes
1answer
36 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
45 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
votes
1answer
59 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 ...
0
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1answer
58 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 ...
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votes
0answers
60 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 ...
0
votes
1answer
54 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
votes
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
votes
2answers
162 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
56 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
69 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
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0answers
16 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
52 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 ...
-1
votes
1answer
69 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
vote
0answers
92 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
110 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
628 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
41 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
372 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
vote
2answers
161 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 ...
1
vote
2answers
140 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
votes
0answers
69 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
vote
1answer
46 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
votes
2answers
49 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
votes
1answer
35 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
votes
2answers
171 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
80 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
159 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
38 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 ...