A chip that sends a signal with more current or voltage, or over longer distances.
26
votes
1answer
868 views
How can I efficiently drive an LED?
I understand that I can not connect an LED directly to a battery because it will draw too much current. Thus, there must be something else in the circuit to limit the current. What options are there? ...
3
votes
1answer
4k views
Motor driver using only a 2N2222 transistor?
Is it possible to build a motor driver using only a 2N2222 transistor?
If yes, then how?
2
votes
2answers
711 views
Laser driver circuit
I like to build a laser pointer driver circuit that I can drive from an 8 bit uC. However, I like to get light output fairly constant. This requires for me to look at the photo detector (these lasers ...
1
vote
2answers
778 views
Need advice on microcontroler to switch relay on/off
I am trying to connect a relay (OMRON G2RL-2A DPST 12VDC) to my PICAXE 20x2 microcontroler. I also have an UNL2803A relay driver.
I managed to get microcontroler to work quite nice, so I don't have ...
10
votes
4answers
3k views
What is the purpose of “MOSFET driver” IC's
There are dedicated "MOSFET driver" IC's available (ICL7667, Max622/626, TD340, IXD*404).
Some also control IGBTs. What is the practical purpose of these? Is it all about maximizing the switching ...
8
votes
2answers
229 views
High Current Pulse on LED
According to Cree Inc Pulsed Over-Current Driving of Cree® XLamp® LEDs app note, driving LEDs with high current pulses can be performed as long as the following guidelines are respected:
Based on ...
6
votes
2answers
1k views
Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?
My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency.
The question: What ...
8
votes
5answers
661 views
PWM & output voltage
while 555 contest is long gone, I am still debugging my device, where I already abandoned 555 itself :-)
At the moment, I am driving PC fan from an PWM (30kHz) signal from atmel uC.
I am powering ...
5
votes
3answers
920 views
How can I effectively drive multiple LEDs with multiplexing?
I am interfacing my microcontroller (AVRmega32U4) to a 4x4 LED array. There are 2 control lines to operate columns (passed to a 2 to 4 demultiplexer) and 4 control lines to operate rows. I bring a ...
2
votes
2answers
273 views
Square Wave Voltage Level Shifting
I have a square wave signal of 300 KHz which is 0.2 V to 1 V. It is the output of FP5138 Non-Sync PWM Controller IC. I want to drive a PMOS with this square wave but with the levels shifted to ...
4
votes
2answers
808 views
Unipolar and Bipolar Stepper motors
I would like to universal stepper motor driver circuit. Is it possible for one circuit to be able to drive unipolar and bipolar motors with only a firmware change or do they require much different ...
2
votes
1answer
648 views
Power MOSFETs and Gate drivers
I'm trying to finally apply what I learned at university in the course of power electronics.
However I find that both that course and most of the books / online references are lacking on some points.
...
1
vote
2answers
152 views
LED Driver Sink Current
The specs of TI TLC5944 LED driver says "constant current sinking" capability is 60-mA.(LED Power supply voltage up to 15 Volts, and Vcc=3.0V to 5.5 V )
My understanding is if Sink current is low, ...
1
vote
2answers
2k views
Designing high-power LED driver with PWM
Update:
Provided I set up the PIC and program it correctly (planning on using this guide to interface it as a USB HID device), would this be a suitable configuration? I'm not entirely certain how I ...
1
vote
2answers
2k views
L298 Motor Driver spinning motor only one way :/
i just made a motor driver circuit on a veroboard to use with my arduino
but the problem is l298 spinning motor only one way.
here is the code
it was supposed to spin motor forth and backwards every 2 ...
