All Questions
21
questions
2
votes
7
answers
182
views
Circuit to light up LED only once
I have a battery-powered product with an ON/OFF switch with two leads. I am looking for a circuit to shine a LED for a short duration each time the switch goes from OFF to ON. Power consumption and ...
- 465
1
vote
3
answers
176
views
Show polarity of magnetic pulse using two LEDs
I have made this simple circuit:
In response to a rapidly changing magnetic field (pulse), the LED blinks.
An example of the pulse is shown below:
Now I would like to have a circuit with 2 LEDs so ...
0
votes
1
answer
258
views
Capacitor based pulse generator
I want to make a simple circuit where LEDs are alternatively turned on. I have, say, 20 green LEDs and 20 red LEDs. The first half second, the red LEDs should be turned on, the next half second the ...
- 73
0
votes
0
answers
58
views
How Does Osram Measure Pulse Handling Capacity?
Looking at datasheets like the SFH4641 from Osram, I noticed the pulse handling capacity diagram, and although I hadn't really thought about it before, I don't know how they measure that. Niavely, ...
- 110
1
vote
2
answers
193
views
Pulse Dimming to 1-10V
I have a question about the dimming of Led drivers. I have a lot of LED drivers which can use pulse dimming or 1-10V dimming. One problem I have is that I realized too late that by using pulse dimming,...
1
vote
7
answers
4k
views
Is there a way to make an LED blink using a passive circuit?
I am trying to make a simple flashing LED toy to get a 5-year-old boy interested in electronics.
The LED should blink for the shortest time possible
Remain off for several seconds between flashes
The ...
- 886
2
votes
1
answer
83
views
ADC Selection Pulsed Measurement
I am planning to measure the voltage of an rgb LED pulsed with an ADC. The pulse is around 20ms long. The pulse is necessary so the self-heating is within reason so it won´t affect the any ...
0
votes
7
answers
18k
views
How can I light up 3 LEDs in sequence but only one at a time?
I have 3 LEDs in a row on a breadboard. I want to simulate a visual depiction of a current pulse by lighting up LED #1, then turning that off and lighting up LED #2, then turning that off and lighting ...
- 155
1
vote
1
answer
791
views
How can I add a digital pulse generator to a simple LED circuit?
I have a digital pulse generator in the lab (http://www.thinksrs.com/products/DG535.htm). I want to control a simple LED circuit (battery, resistance and diode) using this digital pulse generator.
I ...
- 111
5
votes
1
answer
4k
views
Designing a fast LED driver from scratch
I plan to build a LED driver that can pulse a high-power LED (3 W) down to the 100 s of nanoseconds pulse regime, yet also allows longer pulses (up to 100 ms) should be possible. The LED should be ...
- 51
0
votes
1
answer
119
views
Triggering a LED and interrupting it quickly (with a PIR sensor). What do I need for this?
I'm an artist working on a interactive installation. I'm a beginner in electronics and I'm feeling a little bit lost here, can you help me?
I have a 5v circuit with a PIR sensor activating a LED and ...
- 423
5
votes
3
answers
4k
views
High Power pulsed LED driving circuit
Hi, can anyone describe the operation of this circuit for me, in particular what the 10 ohm resistor is for.
It is meant to achieve a very high level of current through the LED.
Many thanks,
John
- 65
0
votes
1
answer
66
views
Power consumptions of the following 2 LED driving circuits
I have simulated the following two circuits that can drive and pulse the LEDs.The transient result is shown on the right.
The thing I am not sure is that which circuit consumes more power? My idea ...
- 49
6
votes
1
answer
17k
views
MS Surface power supply
I have a faulty Microsoft Surface power supply and I found a circuit diagram for it that I could use some help figuring it.
Specifications:
The LED is supposed to be on only when the Surface's Power ...
- 163
0
votes
3
answers
2k
views
how to close the circuit by relay with a pulse and my circuit stay closed until another pulse comes
I am new in this kind of stuff so please excuse me for my lack of knowledge and English Language :)
I have an old car and I want to make a circuit with an LED that lights when car is switched ...
- 11