i´m from germany and i need help.

i will use 36 leds OSRAM SFH485P in serial wired, 3 leds / block .

Durchlaßstrom
Forward current
IF 100 mA
Stoßstrom, tp = 10 ms, D = 0
Surge current
IFSM 2.5 A
Verlustleistung
Power dissipation
Ptot 200 mW

SFH485p LED DATA

for the power i used a atx powersupplier with 5 volt (red cable)

our electronic partner sell me for this wired 12 resistors with the color BROWN BLACK BROWN GOLD (100ohm !?!?!)
he says, this is okay…

i try this, but no lights to see
then i have build a test wired with only 5v + 3 leds and 1 resistor -
Also, no lights in IRcam…

First Question: 5V to low? I hav fear, for killing the leds when i try 12V.
Second: whats wrong? hmm..
YES, i´m a noob in electronic hardware, i´m php programmer ^^

please tell me a correct wired plan when “time is on your side”.

and sorry for my crazy english.

I’ve got a standard 13.8V - 20 A power supplied.
I want to try to test my webcam, so I made a little circuit of 8 leds SFH845P and a 18 Ohm resistor (thanks to ledcalculator.net)

So my webcam is working great ! But my leds are very bright at the beginning and then the intensity of the infrareds are getting down. I even killed the last led before the resistor.
I have very little knowledge as you can see because I have probably made a huge mistake but can figure out what ... before wiring everything I want to be sure of what I am doing .

I plan to build a circuit with 84 leds, results on led calculator seems clear for me but maybe I should use another power supply.

Many thanks,
Cédric

pqlabs.com

Lumatek 400w electronic ballast

I’m new to the multi touch world.

How would I power 4 lasers with my computer’s power supply 5V line.
I know it can give me max 1A. My lasers are rated at 3.2V and people says that they use 40mA.

I thought about wiring my lasers in parallel like this:

What resistor should I use?

btw, I have basic understanding of electronics, it’s just because I want to make sure that I won’t toast them. After all you guys have more experience with Aixiz lasers then me.

Thanks

Do you think it is good idea to use 5V power supply from computer SMPS for lighting Lasers. The lasers are the one recommended on peauproductions.com (http://peauproductions.com/docs/aixiz_780_laser_ds.pdf)

so Tell me will this configuration will good enough or I have to used some thing else ,if yes then tell me also which one ?

ALSO tell me any online shop so I can get them very quickly(in very less sipping time)

-Gary

You can see a full list by searching for various electronics related terms : http://webcast.berkeley.edu/new_search.php?search_value=circuits&category=all&type=both&courseid=&semesterid=&submit=Search

For electronics, Berkeley has the following Courses available for FREE!!:

EE 42/EE 100 Introduction to Digital Electronics

EE 42 - Spring 2008 - This course serves as an introduction to the principles of electrical engineering, starting from the basic concepts of voltage and current and circuit elements of resistors, capacitors, and inductors. Circuit analysis is taught using Kirchhoff’s voltage and current laws with Thevenin and Norton equivalents. Operational amplifiers with feedback are introduced as basic building blocks for amplication and filtering. Semiconductor devices including diodes and MOSFETS and their IV characteristics are covered. Applications of diodes for rectification, and design of MOSFETs in common source amplifiers are taught. Digital logic gates and design using CMOS as well as simple flip-flops are introduced. Speed and scaling issues for CMOS are considered. The course includes as motivating examples designs of high level applications including logic circuits, amplifiers, power supplies, and communication links.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978507

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EE 40 Introduction to Microelectronic Circuits
10:00-11:00 AM | 10 Evans
Instructor Constance Chang-Hasnain

EE 40 - Fall 07 - Fundamental circuit concepts and analysis techniques in the context of digital electronic circuits. Transient analysis of CMOS logic gates; basic integrated-circuit technology and layout.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978488 (2007)

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EE 240 Advanced Analog Integrated Circuits

EE 240: Advanced Analog Integrated Circuits - Spring 2006. Analysis and optimized design of monolithic operational amplifiers and wide-band amplifiers; methods of achieving wide-band amplification, gain-bandwidth considerations; analysis of noise in integrated circuits and low noise design. Precision passive elements, analog switches, amplifiers and comparators, voltage reference in NMOS and CMOS circuits, Serial, successive-approximation, and parallel analog-to-digital converters. Switched-capacitor and CCD filters. Applications to codecs, modems. Lectures available as streaming video at webcast.berkeley.edu/courses.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978279

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EE 241 Advanced Digital Integrated Circuits

EE 241: Advanced Digital Integrated Circuits - Spring 2006. Analysis and design of MOS and bipolar large-scale integrated circuits at the circuit level. Fabrication processes, device characteristics, parasitic effects static and dynamic digital circuits for logic and memory functions. Calculation of speed and power consumption from layout and fabrication parameters. ROM, RAM, EEPROM circuit design. Use of SPICE and other computer aids. Lectures available as streaming video at webcast.berkeley.edu/courses.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978280

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EE 247 Analysis and Design of VLSI Analog-Digital Interface Integrated Circuits

EE 247: Analysis and Design of VLSI Analog-Digital Interface Integrated C - Fall 2006. Architectural and circuit level design and analysis of integrated analog-to-digital and digital-to-analog interfaces in CMOS and BiCMOS VLSI technology. Analog-digital converters, digital-analog converters, sample/hold amplifiers, continuous and switched-capacitor filters. RF integrated electronics including synthesizers, LNA’s, and baseband processing. Low power mixed signal design. Data communications functions including clock recovery. CAD tools for analog design including simulation and synthesis.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978361 (2006)
http://webcast.berkeley.edu/course_details.php?seriesid=1906978451 (2007)

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EE 231 Solid State Devices

EE 231: Solid State Devices - Spring 2006. Physical principles and operational characteristics of semiconductor devices. Emphasis is on MOS field-effect transistors and their behaviors dictated by present and probable future technologies. Metal-oxide-semiconductor systems, short-channel and high field effects, device modeling, and impact on analog, digital circuits. Lectures available as streaming video at webcast.berkeley.edu/courses.

http://webcast.berkeley.edu/course_details.php?seriesid=1906978281

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So there’s not really any excuse for not being able to solder a few simple led’s together now is there!