Classic Circuits You Should Know: High Power LED Strobe Light
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- เผยแพร่เมื่อ 28 ก.ย. 2022
- Classic Circuits You Should Know: High Power LED Strobe Light
in this video we use a 555 timer with both adjustable frequency and duty cycle as a clock driver for a MOSFET switched 10W LED Strobe.
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Finally! I've been looking for a strobe circuit like this for so long, but all I could find were basic blinking circuits. Thank you.
One day, I will remember your saying "something about your drain and source".
That flasher works great, simple, effective and bright. That could be part of an intruder blinding system. Someone walks onto your porch and a bunch of those 10 watt LEDs fire off in all directions blinding the intruder. Then, a can of pepper spray fires it's contents.
Almost Friday, have a great PRE-weekend. ☮
And if that doesn't work, an automatic bucket of cow dung, to the intruder's head!
Classic 555 circuits rule!💪🏼
Great video
Nice 👍
Paul Thank you, I got it.....
Good job done
it is interesting. It is not bad to show the waveform, duty cycle and frequency range with an oscilloscope. Thanks
I just watched your 555 timer led dimmer video and was wondering if it was possible to do that circuit in conjunction with the 74hc595 shift register(s) to control the brightness of the all the leds (multiple 7-segment displays) at once? Anyways love your videos! Always makes me ponder.
I have always wondered how they do the multi random pattern shows. I figure multiple chips and each chip has specific timing characteristics within in
We used to make led eyes for our haunted house with 555’s. The l.e.d’s were on for a few seconds and then would “blink” off for a fraction of a second.
Fun
Love the 555
Well that's going to cause Halloween Seizures. :)
why mosfet and not a bjt or jfet?
current
You lost me on the duty cycle. Is this just limiting the output voltage of the 555 to act as a "dimmer" switch so to speak. If you took that out of the circuit, would the led would just run at one intensity?
duty cycle time on vs time off
@@learnelectronics ok. is that not the same then as the frequency, off and on, number of flashes per second etc?
second diode (cathode up) goes to ground? please check it, looks like voltage divider low end goes to GND will not work, it will not trigger Atomic Device😂
did you watch the video??? it works.
@@learnelectronics I exactly copied the schematic in the video, if the second diode is connected to the bottom half of the voltage divider ( which is connected to ground/or so it seems) then it does not work, it works if the voltage divider is isolated from the ground.
Why can’t you get a 50% duty cycle with a 555 timer?
you can, but not with two equal value resistors, that will give you about a 66% duty cycle. You would need to calculate optimal resistor values. This goes back to an old saying a professor used to say "If you cant make it precise, make it adjustable."
@@learnelectronics That was what I discovered - apparently the capacitances of some transistors inside the 555 timer may also have influenced the duty cycles as well - as well as just make it adjustable. You can almost certainly cheat if you must however.
PAUL, The LED is a 10 watt LED? the 555 timer output pin can't source more than 500mA, so where is the high current coming from when VCC is +5vdc and the 555 output pin is max under 1 amp so it cant be 10 watts? please explain on paper in a video lesson
I'm putting 9 volts into the 555 timer. The high current is coming through the MOSFET. The LED is drawing current directly from the VCC rail. It passes through the LED and then the MOSFET switches it on and off. So it is the MOSF at the handles. The high current The only thing the 555 timer is doing is acting as a clock source outputting pulses onto the gate of the MOSFET
@@learnelectronics The LED would also needs to be a high wattage LED to handle the high current? you have to find a high wattage LED?