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

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1answer
29 views

Current Controlled Output Using PWM

I am looking to control a proportional valve with a PWM signal that will correlate into exact current amounts (for example a 25% duty cycle will output 200mA, and a 90% duty cycle will produce let's ...
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0answers
54 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
1
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1answer
42 views

High and Low Side Driver vs. Half-Bridge Driver

Please excuse me for what I am about to say as this type of area is all completely new to me. I am currently attempting to construct an H-bridge (which is a primer to my attempt in constructing a ...
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2answers
72 views

Can I use a dual high-side low-side gate driver as a dual low-side driver?

Some background: I am building a 350 VA DC to AC inverter, partly for my own curiosity, but mostly for a senior design project for my bachelor's. What I have with me is monolithic dual high-and-low ...
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2answers
80 views

Can the output of two 15-amp motor drivers be hooked up in series to achieve a 30-amp tolerance?

I had a cheap 15-amp motor driver that I bought on eBay. You can see product details here. I was planning to use this motor driver to power my robot, which uses two 24v wheelchair motors. Then I ...
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1answer
87 views

L298N damaged? What to do?

I'm trying to control a DC motor with the L298N motor driver and it worked for a brief moment. I've used the setup mentioned in this video tutorial, but someone in the comments said that with this ...
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2answers
28 views

Differential Driver Maximum Output Voltage Swing

I'm trying to understand how BTL driver on TI's DRV8662 Piezo Haptic Driver (datasheet) works. What I am confused about is how a 200Vpp output signal can be generated from a driver that only has rails ...
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1answer
42 views

Writting Joystick drivers for ARM Cortex [closed]

I need to write a driver for Xbox360 joystick controller, using its module and everything. The idea isn't just take the code, I'm really interesting in the theory behind it. Does anyone have any ...
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1answer
80 views

Motor/driver for smoothest and most constant speed

Which type of motor/controller can maintain the smoothest and most constant speed in the range 300 - 1000 rpm with minimal vibration? ie: low cogging torque, etc. I have an application in mind which ...
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0answers
28 views

Problem with microstepping mode and A4988POW

I'm trying to use the A4988POW stepper driver in 1/16 micro stepping mode to drive a stepper motor with low stepping frequency (~ 10 steps/s) for tacking an astronomical telescope. However in this ...
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2answers
134 views

Circuit to dim 40A/12V LED chain with PWM (Arduino output)

We have about 170 feet of LEDs (12VDC, 2.88W/foot) wired up in one chain. Currently they are driven by two switching power supplies (12V/27A). We'd like to control the whole chunk of them together, ...
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0answers
51 views

Multi Channel High Current LED driver

I am working on my capstone project in electrical engineering and I am looking for a RGB LED driver that can operate 350mA LEDs. I am using 9 RGB LEDs and I would like to get a multichannel LED ...
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2answers
52 views

Explain how this LED driver circuit will work - is there any way to turn on the LED?

Is there any way to turn on the LED in the below figure? You can apply different voltages at the diode input:
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1answer
104 views

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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2answers
80 views

Increasing the PWM voltage level from 1.8V to 3.3V

I need PWM pulses of 3.3V, and my micro-controller is giving 1.8V PWM signals. I have a voltage source of 3.3V. One way I am thinking is to use two cascaded inverters(like NOT-GATE) using MOSFETs. Is ...
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0answers
63 views

A4973 DC motor driver design considerations

I'm dealing with a motor driver circuit connected to a microcontroller (ATmega328). The load is a brush DC motor running at 12V nominal voltage. I need to detect when the motor is stall and for this ...
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2answers
242 views

linear-control 12V DC fan with 5V low-current (Arduino)

I am trying to control a 12V DC computer fan ... without PWM for longer life and less high-frequency sound emitting Controlled by 5V positive voltage coming from the arduino after a DAC Using a ...
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2answers
101 views

Weird behaviour of logical mosfet in proteus

I'm trying to drive a P-Mosfet logical from a 2-3Decoder 74HC238, the problem is whatever the Input to the MOSFET's gate, I always get a high output on the drain. Kindly find the attached schematic, ...
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2answers
111 views

Re-design for common anode instead of common cathode

I have a very simple circuit, and I want to use a tri-color LED to indicate which 1 of 3 outputs is on. I currently have a design that works for a common cathode 4-pin LED. However, I have easier AND ...
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2answers
159 views

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 ...
2
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4answers
357 views

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 ...
2
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0answers
146 views

How to drive 400W of High-Powered LED's in parallel / series?

I want to create a luminaire (a lighting unit) comprised of the following: 5 Nichia LEDs running @ 70.2W / 39V / 1.8A 6 Cree LEDs running @ 2.2W / 3.2V / 700mA 14 Cree LEDs running @ 1.61W / 2.3V / ...
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0answers
61 views

Problem when connect ProPIC2 and USB to Parallel port adapter

I have a ProPIC 2 programmer which needs parallel port (DB25) to work but I don't have in my notebook that port (SO: Windows 8), so I'm using a USB-Parallel adapter. When I connect the device it ...
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1answer
151 views

Driving High Power LEDs with this circuit

I've just completed building this circuit (thanks alexan), times 3 for each RGB channel. R1 = 4.7k R2 = 1K R3 = 10K Q1 = BD140 Q2 = BD139 This circuit is used to power 4x20mA RGB LEDs in ...
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1answer
205 views

Is there a way to reset an arduino to factory settings?

I tried to make custom library for my Leonardo to work as a native gamepad, but as it turns out, it isn't as easy as it looks. After i got some code of core arduino and imported it, everything ...
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1answer
327 views

Alternative to easy-driver (or adafruit motor shield ) on breadboard [duplicate]

I'm up to implementing bipolar stepper drivers with STEP and DIRECTION inputs just as like easydriver and pololu stepper drivers but that on breadboard.Earlier I was using L293D to do that , but it ...
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1answer
108 views

Magnetic coupling of inductive loads

I have been working a little bit on a hobby project of mine involving inductive power distribution. I have never done anything like this before and before I hook things together I would like to avoid ...
2
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2answers
76 views

How to “auto-disconnect” from rs485 bus when power off

I have many devices on a RS485 bus. When I disconnect power from one device, the rest of the (powered-on) devices seem to communicate with each other just fine. At least it seems to be working today. ...
7
votes
7answers
335 views

Mosfet Driver not driving mosfet

I have the following circuit: The MCP1402 MOSFET driver should be driving the BUK7Y13 N-channel MOSFET at 12V, but I'm seeing a much weaker signal which oscillates around 0.7V, preventing the gate ...
2
votes
3answers
411 views

Cheap 4 digit 7 segment display driver

Can anyone recommend a cheap ( less than $4 ) driver chip capable of driving a 4 digit, 7 segment display with the center colon? I'm very familiar with the likes of the MAX7219 and similar but they ...
1
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1answer
166 views

Switching a ULN darlington array from TLC5940 driver?

I feel this is going to be a stupid question- TLC5940 is a 16-channel, constant-current sink LED driver. ULN2004A is a high-voltage high-current Darlington transistor array. Since the TLC5940 is ...
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0answers
163 views

How to drive a 16x16 common cathode dual colour multiplexed LED matrix?

I tried using specialized LED drivers at first but found they're pretty much all made for common anodes since they switch on the low side. So I came up with the following transistor-based driver ...
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1answer
78 views

Led grow lights

I need some advice regarding high powered LED chip and boost step up/down modules. Firstly can a boost device be used with constant current drivers to reduce forward current to chip? I have a 72w ...
1
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3answers
200 views

Always ON high-side MOSFET driver

In a high voltage application (30-40V) am looking to drive a high side MOSFET which is sometimes required to be some for considerable amount of time (hours or days). [Edit] It is shown in the block ...
0
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1answer
510 views

Proper Windows 8-64 bit driver for Arduino Yún (Yun)

I am trying to setup Arduino environment under Windows 8-64bit running on VMWare Fusion 6.0.2 host machine. I connect the Yun to my windows machine and the device get detected under windows but ...
2
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0answers
98 views

Controlling a treadmill motor

I'm recycling some spare parts of an old treadmill for a new project. I have the motor with its driver board, the elevator piston and the controller board. All works out of the box, but I need to ...
1
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1answer
48 views

Using a Logic Analyzer for Device Drivers (low level)

Sort of a follow up to this question: http://stackoverflow.com/questions/19760764/learning-to-write-low-level-drivers-linux/19761953?noredirect=1#comment29386523_19761953 For example I want to take a ...
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0answers
63 views

Daisy chain 8bit & 16bit shift register/led driver together possible?

Is it possible to daisy chain a 16bit shift register with a 8bit shift register? E.g. I would like to connect a STP16CP05(16bit) led driver with a STP08CP05 (8bit) to save three connection pins from ...
1
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1answer
283 views

3.3v and many Leds: LED brightness?

I'm using a Teensy 3.0 which outputs 3.3v 100mA. I would like to connect many leds (probably 100…). Obviously I fear that the brightness of all the leds will be lower than I like to. I'm using the ...
5
votes
2answers
154 views

Automatic swinger from spare CD drive

An idea that comes to my mind to swing a baby swing automatically is using a CD drive eject - close function , I have several such drives I dont use and I dont want to use a computer to do the ...
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2answers
97 views

Electric vehicle power component selection help

I need your advice on high power device selection. I'm working with a similar application to this schematic, with the descriptions being in this forum. Without reading through the dozens of pages ...
2
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2answers
277 views

AC coupled gate drive

I am trying to get a MOSFET/IGBT driver to work for almost a year. The last efforts utilizing a bipolar Totem pole driver failed without mercy. For some time I studied alternatives and came to AC ...
4
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4answers
935 views

H-bridge driver circuit

I am trying to use the IGBT driver IR2184 to drive a H-bridge made of powerpack CM100DU-24F. Here is the circuit I built: simulate this circuit – Schematic created using CircuitLab a) ...
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2answers
328 views

Powering 11 x 10 watt LED array

I am building a LED array and am unsure of if I have been given bad information. I was told i can use a PC PSU to power my LED array safely using resistors and rheostats to dim them. After doing some ...
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0answers
139 views

Why is my H-Bridge driver coupling low input into the high side?

I have struggling for about a week with this problem and I am not sure how to fix it , so stack exchange community please help :). Ok so basically I am making a h-bridge using 4-N channel mosfets, ...
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1answer
214 views

4,5V 650nm laser, will I need a driver?

I just bought a package of 100 laser diodes on eBay: http://www.ebay.com/itm/110887381932?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 My first question is: Will they need a driver? ...
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2answers
412 views

Boot strapping Vs Charge pump

When driving a high-side MOSFET, we have the option of either bootstrapping or using a charge-pump. Assume that my operating frequency is very high. Which method I should go for to drive the high-side ...
4
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1answer
241 views

LED driver problem

I am using an LM324 and three TIP122 transistors to drive three 40V 40W led's. The problem I am having is the LED's don't shut of all the way (a very dim glow remains). If I use only one op amp (out ...
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3answers
2k views

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 ...
2
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2answers
2k views

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 ...