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

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34 views

Is it possible to manipulate my WCDMA modem's code? [on hold]

I have a WCDMA data card (WCDMA modem) that is used for Internet connectivity. Unfortunately it has been designed so proprietary that I cannot connect to any WCDMA other than the one who branded my ...
0
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1answer
33 views

Additional current source for large LED-7-segment-display

I have two sets of LED-7-segs. Each with 4 Digits, all 4 inch tall. One set CC, the other CA. Combined they consume some smooth 1.68A / 1.4A according to the data sheets. That is manifold the ...
4
votes
4answers
785 views

How does a Line Driver actually works?

So I've searched for days for information about the 74HC244 line driver. As always, the Datasheet provides raw and not very good information about the actual component :) (I mean, it gives us the ...
0
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1answer
62 views

Sending Signals over a Coaxial Cable [closed]

Recently I've been trying to understand how multiple signals can travel along a coax cable. Indeed, I have already read "How are multiple signals propagated in a coaxial cable?", but it doesn't seem ...
0
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1answer
46 views

Stepper motor driver differences?

I have recently used a H bridge to control a small stepper motor obtained from a DVD drive and now want to look into controlling something larger, for example large Nema 23 steppers. From reading ...
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2answers
33 views

Usage of WS2821

I got a buck load of WS2821a, and I was wondering, can I use it for something else than driving LEDs? TechSpec: http://www.world-semi.com/uploads/soft/140305/1-140305102109.pdf Can it be used for: ...
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0answers
28 views

Can DRV8837 be used to drive two DC motors in all four ways?

Knowing that some motor drivers do not perform well under low input voltages, I have found that this works well; but how do I drive motors in the following four ways: ...
0
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0answers
30 views

Driver needed if controlling other devices?

I want to control several other devices with my beaglebone black. Now I was thinking if I need a driver or something else to prevent my beaglebone from getting burned or similar damage. The output ...
0
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1answer
92 views

Stepper motor is heating up?

I am using stepper motor for my CNC machine. Its model number is EM284 STP-42D221-01 by Shinani Kenshi. I don't know any specs of this motor; neither voltage rating nor current rating. I don't even ...
0
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1answer
72 views

Two different outputs from same type of IC's

Hello Electrical engineering community. I am using motor drivers to get 5v to 12v and I am controlling each motor with each IC L293D. Each motor driver is controlling each motor and the outputs is ...
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1answer
64 views

How big of CC driver do I need?

I am making a grow light. I have 72 3-watt LEDs on an aluminum sheet. 10 blue 62 red. They are wired in series. How big or how many watts LED driver do I need to power the light? I have 100 watt CC ...
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2answers
77 views

What's wrong with this IR2110 pulse transformer driver?

I'm trying to drive two MOSFETs through a pulse transformer. I'm using the "Power Supply Cookbook – Second Edition" book from Marty Brown. According to the book the formula to calculate the number of ...
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0answers
61 views

Modifying LED driver

A friend of mine gave me an LED driver that drives 30-36V and 3 amp in the output. Is there any way I can modify that to get 20-22V and 4-4.4 A to power a new LED I got? I live in Argentina, and ...
0
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1answer
21 views

Drive Stepper Motor using parallel Port

im having a little difficulty to drive this kind of motors using parallel port..have googled loads tutorials but unfortunately couldnt found any color codes or types of motors i have..i cannot even ...
2
votes
2answers
84 views

Push-Pull driver for low side mosfet — is it a good idea?

I want to build an H-bridge to control a 36V dc motor (or possibly 48V but lets stick to 36V for now) The electronics that will control the H-Bridge (logic, etc) will run from a 12V ...
2
votes
4answers
149 views

Pulse Detection

I have the following simple LED driver. I over drive LED much beyond its current limits in terms of current. (50mA @ 25% duty cycle with an RMS current around 12mA). In this case the circuit ...
1
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1answer
148 views

Do these LED's have a constant current driver built in?

I bought these LED's of eBay and connected them all (5) in parallel with a 4.7Ohm series resistor each. This should have given me a total current draw of 1.7A. However, when I measured it, I was only ...
2
votes
1answer
96 views

Combining LC filters

I would like to add an EMI filter to a high power LED driver. The datasheet of the driver suggests an LC filter for the power line as shown below. However I would like to use more than one driver ...
0
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2answers
64 views

Controlling LEDs [duplicate]

I am needing to control about 75 Infrared LED's individually of each other (can turn each on and off) through the use of the program LABVIEW. Originally I was thinking of using multiplexers to ...
-1
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1answer
53 views

Are LED drivers inter-switchable?

MR16 type LED bulbs need their halogen counterparts' driver replaced due to low power consumption and they require an "LED driver" that can deliver the necessary wattage. On the other hand, LED ...
0
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1answer
86 views

Can I control multiple stepper motor drivers from one controller?

I need to drive 6 stepper motors in open loop with 1/4 microstepping. The application requires all 6 motors to move by the same number of steps at the same time. There are no sensors of any kind on ...
2
votes
1answer
59 views

Electromagnet for string vibration

I recently read a lot about guitar sustainers, for those who don't know what are they - it is basically an electromagnet with an amplifier. It takes an input from pickup, amplifies it and then ...
0
votes
1answer
153 views

Running a low voltage stepper motor with a A4988 and 5V power suply

I got this little car I built using two of these motors and A4988 drivers. It was running with a 12V power supply, but I'm trying to get it on a battery and running for about 8 hours. thought I could ...
2
votes
2answers
140 views

Sourcing current with sink LED driver

I'm using an existing keypad with 8 LEDs that source power. I was hoping to use and LED driver of sorts, but all of the ones I find only refer to sinking power. Is it possible to use these drivers to ...
0
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2answers
89 views

How do you perform circuit calculations for the darlington pair

I need to know what formulas or set of calculations would be used to figure out the base resistor and load resistors when hooking up a darlington pair as my datasheet for the ds2003 does not provide a ...
1
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1answer
53 views

Beagleboard USB Packet sniffer

I had picked up a beagleboard a few weeks ago and had then looked into the USB sniffer project that had been created a while back. (https://gitorious.org/beagleboard-usbsniffer/) I understand that ...
0
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1answer
102 views

Beep patterns generator

I would like to generate the following beep patterns using a piezo buzzer: Single long beep Two short beeps Single short beep Is there any specific chip I can ...
0
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0answers
59 views

AC Linear Actuator Driver for Arduino

For experimental purposes I want to build a 1-axis Polar Tracker and use an Arduino as a PLC unit. As I know it's necessary to use an Opto-isolator to prevent high-voltage from affecting low-voltage ...
2
votes
3answers
114 views

Parasitic Capacitance and AC Coupling

I was reading on Capacitive Coupling a bit and become confused when reading the Parasistic section, specifically regarding two claims. If a high-gain amplifier's output capacitively couples to ...
0
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0answers
49 views

Calculating power draw for LEDs and driver (TLC5941)

I am designing a backlit keyboard with 61 white LEDs. These will be individually driven by a TI current limited PWM driver (TLC5941). LEDs: 61 x Osram LCW JNSH.PC (Datasheet) Drivers: 4 x Texas ...
0
votes
1answer
98 views

Simple high side driver for multiplexed 7-segment displays?

How can I best drive and switch high side power (for multiplexing) between the 7 displays with as few components as possible, for under $2. I am trying to simplify a design. I have a custom board ...
1
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1answer
150 views

LED driver circuit help needed

Please help me figure out which inductor to use from this datasheet. Sorry - it's in Chinese as this is an Asian sourced IC and not sold in the US. (Use google translate if necessary - but, the ...
-1
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2answers
89 views

Can a few inexpensive components light a white led from 2 AAA alkaline batteries? [closed]

Please help with finding an energy-efficient LED driver circuit for 2 AAAs(all the way down to 2V), for example for this LED: ...
0
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1answer
129 views

Why is a resistor put before the gate of a transistor?

In most of the H-bridge driver circuits I've come across so far, there's a resistor in the path of the signal to the gate/base of the mosfets/BJTs, like in the images below why is it put there ? ...
0
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3answers
131 views

Hot MOSFET DC-DC Boost Converter

What: I'm designing a DC-DC Boost converter for a solar panel maxmimum-power-point-tracker (MPPT). Setup: I'm using a TPS2819 MOSFET driver connected to a FQD16N25C N-MOSFET. The TPS2819 is driven ...
1
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0answers
68 views

Driving, feeding and similar terms in electronics

My technical background isn't very strong, and I often hear about one circuit "driving" another, or "feeding" it. Although, intuitively, I believe I understand the concept, I am not sure I would be ...
0
votes
2answers
97 views

Can I use a LED Driver to control a Solenoid?

I have on order an LED driver and I want to use it as a simple 12v DC output to control a Solenoid Valve. The Driver says Constant Current & Constant Voltage. I obviously don't want 1A pumped ...
8
votes
1answer
283 views

Severe ringing when high side MOSFET in half bridge circuit switches on

I have designed a PCB (intended as a prototyping building block) that has a IR2113 high and low side gate driver driving two IRF3205 (55V, 8mΩ, 110A) power MOSFETs in half-bridge configuration: ...
-1
votes
1answer
81 views

How is possible to connect 3x 100w led lights to a 300w led driver?

Could you explain if is possible to connect 3x lamps of 100w to 300w led driver? The led driver specification is: constant current, 27-36v, 9A. The lights: 1x, 27-30v, 3.5A, and 2x, 30-36, 3A. So, ...
1
vote
1answer
153 views

Porting Linux drivers specifically I2C

I am developing an I2C driver for an accelerometer. My objectives (actually it's the restriction I have as per the project guidelines given in my institute): use Linux flavour of operating systems ...
1
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2answers
182 views

Peak current limiting motor

I've got a motor driver which can take 3A. But my motor seems to draw more than 3A as peak current when it's been turned on. And I would like to get rid of that since it blew up my motor driver a few ...
0
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0answers
64 views

How to connect SINAMICS V60 driver to RaspberryPi

I have a Siemens motor with SINAMICS V60 driver (10A). Here is the Getting Started Manual (28MB PDF) . I want to connect this driver to the GPIOs of my raspberry Pi board. The purpose is to control ...
0
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0answers
59 views

3x CAT4101 parallel with CREE LEDs

I've tested the LEDs with one CAT4101 and they work great, but now it's time to dial it up a notch. I've now got three CAT4101's wired up in parallel to give me 3A to drive two 10W CREE LEDs in ...
1
vote
1answer
109 views

Can a Solenoid be driven from one of the pins of a Servo controller?

Would it be possible to operate a solenoid (e.g. this Plastic Water Solenoid Valve - 12V - 1/2" Nominal, suggested for use with "a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive ...
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votes
2answers
122 views

Is it a bus or driver? [closed]

A responsible designer has decided that we have a bus on the right and a buffer on the left. Do you think the same?
2
votes
1answer
113 views

Something better than an H-bridge to drive motor?

Is there something better than an H-bridge to drive two motors using the ATmega8 with a 7V power supply? My teacher said the H-bridge overheats and is bad. Is there a better solution? For instance: ...
0
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2answers
44 views

Driving TEC below rated voltage

Can a TEC driving IC such as the MAX1979 rated for TEC voltages up to 6V be used to control a 12V TEC - can TEC work under their rated voltage, with the amount of heat moved controlled by current, or ...
0
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1answer
58 views

DRV8835 OCP false trip?

I built a simple motor driver circuit using Texas Instrument's DRV8835 motor driver IC. The IC is driven in IN/IN mode, (the mode pin is left unconnected, pulled down by the internal resistor). VM is ...
2
votes
2answers
561 views

Why use stepper/DC motor driver?

Why use or implement a DC/stepper motor controller? Is it not possible to connect the motor directly to an MCU output pin without the driver?
1
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1answer
99 views

How to choose a correct LED PWM driver?

I would like to control an RGB LED via a (vendor specific) microcontroller. However its maximum output current is 60mA whereas my LED requires 100mA. I have seen number of LED driver solutions with ...