El 23/09/2020 a las 6:08, rhor...@gmail.com escribió:> I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights. >We did that many years ago with a small microcontroller and a triac, it worked very well. The application was sunrise/sunset simulation in a city small-scale model. -- Saludos Miguel Giménez
Slow fade-in circuit
Started by ●September 23, 2020
Reply by ●September 23, 20202020-09-23
Reply by ●September 23, 20202020-09-23
On Wednesday, September 23, 2020 at 4:22:12 AM UTC-5, whit3rd wrote:> On Wednesday, September 23, 2020 at 1:20:28 AM UTC-7, rhor...@gmail.com wrote: > > On Wednesday, September 23, 2020 at 12:39:09 AM UTC-5, whit3rd wrote: > > > LED fixtures that take 110VAC are all different types and designs, and while some come with dimmer > > > options, not all do. > > I am aware, thanks. Non-dimmable bulbs do not work well with dimmers. 'Big surprise. It is easy enough to buy dimmable LED bulbs. > No, that's not the only option; you can get LED light fixtures that accept low-voltage controls, and safely > wire in something that does the brightness slew limiting that you want. > > <https://www.superbrightleds.com/moreinfo/led-panel-light/2ft-x-2ft-recessed-led-steel-troffer-light-40w-5000-lumens-dimmable/5837/> > > The dimmer input accepts a zero-to-ten-volt signal.You are not reading what I wrote. These are CEILING FANS in a HOME THEATER. Alternate fixtures are not an option; they are part of the ceiling fan. The dimmer must be considerably smaller than a matchbox so it can fit in the bell housing.
Reply by ●September 23, 20202020-09-23
On Wednesday, September 23, 2020 at 4:39:52 AM UTC-5, Miguel Giménez wrote:> El 23/09/2020 a las 6:08, rhor...@gmail.com escribió: > > I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights. > > > We did that many years ago with a small microcontroller and a triac, it > worked very well. The application was sunrise/sunset simulation in a > city small-scale model. > > -- > Saludos > Miguel GiménezA microcontroller would present a number of problems, one of which would be supplying power. Although there are certainly solutions to provide 5VDC from 120VAC, they tend to take up a good bit of space. An analog device able to work directly from 120VAC is a better solution.
Reply by ●September 23, 20202020-09-23
On 9/23/2020 7:01 AM, rhor...@gmail.com wrote:> On Wednesday, September 23, 2020 at 4:22:12 AM UTC-5, whit3rd wrote: >> On Wednesday, September 23, 2020 at 1:20:28 AM UTC-7, rhor...@gmail.com wrote: >>> On Wednesday, September 23, 2020 at 12:39:09 AM UTC-5, whit3rd wrote: >>>> LED fixtures that take 110VAC are all different types and designs, and while some come with dimmer >>>> options, not all do. >>> I am aware, thanks. Non-dimmable bulbs do not work well with dimmers. 'Big surprise. It is easy enough to buy dimmable LED bulbs. >> No, that's not the only option; you can get LED light fixtures that accept low-voltage controls, and safely >> wire in something that does the brightness slew limiting that you want. >> >> <https://www.superbrightleds.com/moreinfo/led-panel-light/2ft-x-2ft-recessed-led-steel-troffer-light-40w-5000-lumens-dimmable/5837/> >> >> The dimmer input accepts a zero-to-ten-volt signal. > You are not reading what I wrote. These are CEILING FANS in a HOME THEATER. Alternate fixtures are not an option; they are part of the ceiling fan. The dimmer must be considerably smaller than a matchbox so it can fit in the bell housing. >Wow, what a pain in the ass. Guy said nothing about ceiling fans in the original post. Imagine showing up looking for free work and barking orders simultaneously. Wanna bark orders at least have the decency to pay someone for the privilege. IOW get a grip, pal.
Reply by ●September 23, 20202020-09-23
On Thursday, September 24, 2020 at 12:10:11 AM UTC+10, bitrex wrote:> On 9/23/2020 7:01 AM, rhor...@gmail.com wrote: > > On Wednesday, September 23, 2020 at 4:22:12 AM UTC-5, whit3rd wrote: > >> On Wednesday, September 23, 2020 at 1:20:28 AM UTC-7, rhor...@gmail.com wrote: > >>> On Wednesday, September 23, 2020 at 12:39:09 AM UTC-5, whit3rd wrote: > >>>> LED fixtures that take 110VAC are all different types and designs, and while some come with dimmer > >>>> options, not all do. > >>> I am aware, thanks. Non-dimmable bulbs do not work well with dimmers. 'Big surprise. It is easy enough to buy dimmable LED bulbs. > >> No, that's not the only option; you can get LED light fixtures that accept low-voltage controls, and safely > >> wire in something that does the brightness slew limiting that you want. > >> > >> <https://www.superbrightleds.com/moreinfo/led-panel-light/2ft-x-2ft-recessed-led-steel-troffer-light-40w-5000-lumens-dimmable/5837/> > >> > >> The dimmer input accepts a zero-to-ten-volt signal. > > You are not reading what I wrote. These are CEILING FANS in a HOME THEATER. Alternate fixtures are not an option; they are part of the ceiling fan. The dimmer must be considerably smaller than a matchbox so it can fit in the bell housing. > > > Wow, what a pain in the ass. Guy said nothing about ceiling fans in the > original post. Imagine showing up looking for free work and barking > orders simultaneously. Wanna bark orders at least have the decency to > pay someone for the privilege.It's rather unrealistic ambition. He wants to control ten watts or more at 110V AC - about 100mA - and wants the whole thing in a package smaller than a matchbox, and simple with it. You can get quite a lot of surface mount components into that sort of volume, but it would need some reactive components, and ones that can cope with that kind of power tend to be a bit on the bulky side. -- Bill Sloman, Sydney
Reply by ●September 23, 20202020-09-23
On 2020-09-23, rhor...@gmail.com <rhorerles@gmail.com> wrote:> On Wednesday, September 23, 2020 at 4:39:52 AM UTC-5, Miguel Giménez wrote: >> El 23/09/2020 a las 6:08, rhor...@gmail.com escribió: >> > I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights. >> > >> We did that many years ago with a small microcontroller and a triac, it >> worked very well. The application was sunrise/sunset simulation in a >> city small-scale model. >> >> -- >> Saludos >> Miguel Giménez > A microcontroller would present a number of problems, one of which would be supplying power. Although there are certainly solutions to provide 5VDC from 120VAC, they tend to take up a good bit of space. An analog device able to work directly from 120VAC is a better solution.NTC thermistor, as used to soft-start projector lamps and such. (It'll get hot in a ceiling rose, set it on fire and burn the house down, but that wasn't covered in the spec either :) -- Ian "Tamahome!!!" - "Miaka!!!"
Reply by ●September 23, 20202020-09-23
On Wednesday, 23 September 2020 05:08:15 UTC+1, rhor...@gmail.com wrote:> I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights.Variac & microwave turntable motor. At least if they already ran off a variac that would be one quick easy approach. NT
Reply by ●September 23, 20202020-09-23
rhor...@gmail.com wrote: =========================> I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights. >** So called "Dimmable LEDs" are not all the same nor dimmable by usual means like triac dimmers or a variac. Most are designed to use a "trailing edge dimmer" that chops the AC wave in the reverse sense to a triac. The circuit inside the lamp uses this clue to control the LED current. See fig 1 for a schematic of such a dimmer. https://sound-au.com/project157.htm .... Phil
Reply by ●September 24, 20202020-09-24
On 9/23/2020 6:57 PM, Phil Allison wrote:> rhor...@gmail.com wrote: > ========================= > >> I need a simple circuit design for a slow fade-in AC dimmer. In a dark theater, suddenly turning on the lights is a somewhat unpleasant experience. I want a simple circuit compatible with 110 volt dimmable LED lights that will slowly ramp the light output over a period of about 5 seconds or so. I have found a number of simple designs that would work for 12VDC LEDs, but none for 110VAC dimmable LED lights. >> > ** So called "Dimmable LEDs" are not all the same nor dimmable by usual means like triac dimmers or a variac. > > Most are designed to use a "trailing edge dimmer" that chops the AC wave in the reverse sense to a triac. The circuit inside the lamp uses this clue to control the LED current. > > See fig 1 for a schematic of such a dimmer. > > https://sound-au.com/project157.htm > > > .... Phil > >These show some promise, the size seems good, it has the 0 to 10 volt control. I have now idea what the impedance of the 0 to 10 volt control is, so not sure how easy it would be to control with an RC. Price is right. Not sure how it reacts to applying AC with the control held at zero. Might need a big resistor or see if these can be modified for 12V operation> https://www.1000bulbs.com/category/25-36-volt-hardwire-constant-current-led-drivers/ 12v-36v unit> https://www.1000bulbs.com/product/209386/HAT-10032.html Here's a 12V unit, but it's a little longer, 4.25" x 1.5".> https://www.1000bulbs.com/product/100980/LEDF-ACA12V12H10M.html Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Reply by ●September 24, 20202020-09-24
