I've been searching and searching and cannot find something to fit my need. I want to slowly ramp my leds on and then when the power goes off slowly ramp down. I'm using a meanwell 60-48d with a 9 volt wall wart right now. The ramp times only need to be about 10-15 seconds. Each meanwell powers a 50 watt led chip (33volt @about 700mA). I can't find any type of circuit for that much of a power hog led. Most circuits I see are for 12 volts or less. I only want to do this so my discus stop freaking out when the lights turn off and on abruptly. Thank you.
I do have a couple 555 timers and a few hundred resistors and capacitors. Any input would be great.
Bump: I also have a few npn transistors too.
You "just" need to apply a 1-10V analog signal to the dim circuit.
That model was the first driver I used and dimming it is one of the reasons I went w/ LDD's and 5V PWM
Works fine w/ things like the Apex..not so well w/ things like Typhons, Storm(x), or any Aduino based controllers..
There are dozens of builds for Aduino and a handful of cheapish PWM controllers
your best bet is converting the 5V PWM to 0-10V analog.
Keep in mind it won't dim to zero (10% is your lowest stable setting) so your light will still "jump" to 10%.
Also requires a secondary timer to shut it off fully..
That said what you need is 1)Typhon.
2)on/off timer and a circuit like this:
DON'T think you can use a Typhon 10V PWM..won't work..
There are some pre-made boards to do this as well ..but I have no guarantee what does or doesn't work.
As I said above, cut my teeth on this but at the time didn't want to add more active circuitry (separate power supply to transistor/opamp) and stubbornly wanted all passive components..
'Almost" got it..long story..
Gave up went to LDD's never looked back.........
looking at that thread again pretty sure this is fully functional w/ any 5v pwm..
basically smooth the pm w/ a r/c circuit and double the voltage...