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

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2
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3answers
53 views

When is an analog input amplifier needed?

I'm reading in values that are coming within the ADC's Vref range... 2.5V. Why do all of the datasheets recommend driver amplifiers and what is the purpose of this if the voltage is in range? Is this ...
1
vote
1answer
32 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 ...
0
votes
0answers
59 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
vote
1answer
43 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 ...
1
vote
2answers
73 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 ...
0
votes
2answers
83 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 ...
0
votes
1answer
89 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 ...
0
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2answers
29 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 ...
0
votes
1answer
43 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 ...
0
votes
1answer
82 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 ...
0
votes
0answers
29 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 ...
1
vote
2answers
145 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, ...
0
votes
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 ...
1
vote
2answers
55 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:
2
votes
1answer
106 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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
2answers
263 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 ...
1
vote
2answers
102 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, ...
0
votes
2answers
113 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 ...
2
votes
2answers
162 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
votes
4answers
382 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
votes
0answers
152 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 / ...
1
vote
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 ...
0
votes
1answer
159 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 ...
2
votes
1answer
215 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 ...
0
votes
1answer
334 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 ...
1
vote
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
votes
2answers
77 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
420 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
vote
1answer
169 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 ...
0
votes
0answers
165 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 ...
-2
votes
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
vote
3answers
203 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
votes
1answer
514 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
votes
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
vote
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 ...
0
votes
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
vote
1answer
286 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 ...
0
votes
2answers
100 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
votes
2answers
279 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
votes
4answers
967 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) ...
1
vote
2answers
331 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 ...
1
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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, ...
0
votes
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? ...
3
votes
2answers
416 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
votes
1answer
243 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 ...
14
votes
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 ...