This thread is for the discussion of the Up/Down Fading LED circuit.
Circuit URL:
http://www.555-timer-circuits.com/up-down-fading-led.html
Circuit URL:
http://www.555-timer-circuits.com/up-down-fading-led.html
Up/Down Fading LED
- Thread starter Admin
- Start date
Hi,
Browsing through the circuits, I came across this one, which will be ideal for a modelling project I am building at present.
It is the Polar Lights kit of the spaceship Spindrift from the 1960s Irwin Allen TV series Land of the Giants.
However, the fade rate is too fast for my needs, it needs to be reduced to half (or more) of its current speed.
A couple of questions:
If I change the resistor (assuming the 33k resistor is the timing component) for a higher value, will that give me the result that I'm after?
For the project, the circuit will need to power up to four high-brightness LEDs.
Is this possible without modifying the circuit?
Sorry for the silly questions... I am returning to electronics after a long absence, and I can't remember what does what on a 555 circuit!
Many thanks,
Don
Browsing through the circuits, I came across this one, which will be ideal for a modelling project I am building at present.
It is the Polar Lights kit of the spaceship Spindrift from the 1960s Irwin Allen TV series Land of the Giants.
However, the fade rate is too fast for my needs, it needs to be reduced to half (or more) of its current speed.
A couple of questions:
If I change the resistor (assuming the 33k resistor is the timing component) for a higher value, will that give me the result that I'm after?
For the project, the circuit will need to power up to four high-brightness LEDs.
Is this possible without modifying the circuit?
Sorry for the silly questions... I am returning to electronics after a long absence, and I can't remember what does what on a 555 circuit!
Many thanks,
Don
Sigh... New to this stuff and trying to get this working. I have assembled and disassembled this 5 times already and get the same results. My LED stays lit and does not fade. RS did not have a 1/4 watt 33k so I got a 1/2 watt 33k. Initially I had my transistor in backwards, I did not read that the pins are viewed from the bottom.
I'm having a hard time making do of your breadboard.
Try building it like this.
I also made a Microsoft word document that contains both the circuit diagram and the breadboard layout in a neat, one page, file that is ready to print. This file is availbe online and you can download that here.
Or watch the Admins video
Try building it like this.
I also made a Microsoft word document that contains both the circuit diagram and the breadboard layout in a neat, one page, file that is ready to print. This file is availbe online and you can download that here.
Or watch the Admins video
I had the same problem as Terry, solid light with no fading. Re-worked the circuit after watching the vid and the best I could manage was a flashing LED. Changed the capacitor and voltage limiting resistor but no fade just a speeding up or slowing down of the flash depending on the value of the two components. The vid was helpful but instead of the music a description of the components and what was being done with them would be of more use. eg placing capacitor between this and that etc. Might sound daft but its not always obvious which hole the legs of the components are actually going in and this can mislead the would be builder instead of helping.
Konrad
Konrad
Awesome page!
Here is my problem,
Not using a led light it would be for audio.
For example when 12v applied to circuit, audio (if only used one of the two wires in audio RCA wire) I could adjust the timing from 0sec to 10sec and the audio would fade up only from level 0 to 100 and stay at 100 until 12v applied then it drops to 0 again.
When triggered the 1st time it goes from 100 to 0 and when triggered again 0 to 100 with in 10sec and stays at 100.
?
Thank you guys
Here is my problem,
Not using a led light it would be for audio.
For example when 12v applied to circuit, audio (if only used one of the two wires in audio RCA wire) I could adjust the timing from 0sec to 10sec and the audio would fade up only from level 0 to 100 and stay at 100 until 12v applied then it drops to 0 again.
When triggered the 1st time it goes from 100 to 0 and when triggered again 0 to 100 with in 10sec and stays at 100.
?
Thank you guys
This is a great circuit, thanks for posting
I was wondering how I can drive a higher power LED with the same, but only on a 5v power supply?
I have a 12v illuminated switch connected, but as it is 12v rated, it stays unlit for longer, it there a way I can provide it all 5v of my supply? Currently it is getting about 3.1v from the supply. I will then get longer illumination cycles, and greater brightness I guess?
Any help gratefully received!
I was wondering how I can drive a higher power LED with the same, but only on a 5v power supply?
I have a 12v illuminated switch connected, but as it is 12v rated, it stays unlit for longer, it there a way I can provide it all 5v of my supply? Currently it is getting about 3.1v from the supply. I will then get longer illumination cycles, and greater brightness I guess?
Any help gratefully received!
