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variable rise and fall light timer

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wemcg

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I need a circuit with a variable rise time then a variable constant on time, then a variable close time. Circuit to be used on 120V AC.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
wemcg said:
I need a circuit with a variable rise time then a variable constant on time, then a variable close time. Circuit to be used on 120V AC.

You don't give anywhere near enough information - for a start what is it to control?, what time span do the three sections need?, and what do you mean by 'a variable rise/close time' - do you mean you want it to fade up and down slowly?, and if so, is it for an incandescent light?.
 

wemcg

New Member
Nigel Goodwin said:
wemcg said:
I need a circuit with a variable rise time then a variable constant on time, then a variable close time. Circuit to be used on 120V AC.

You don't give anywhere near enough information - for a start what is it to control?, what time span do the three sections need?, and what do you mean by 'a variable rise/close time' - do you mean you want it to fade up and down slowly?, and if so, is it for an incandescent light?.

This will be for an incandescent light. Yes I would like it to fade up and down. Would like to be to vary the fade time for both and the time that it stays on. The time for the 3 states would be from 1 to 5 minates.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
wemcg said:
Nigel Goodwin said:
wemcg said:
I need a circuit with a variable rise time then a variable constant on time, then a variable close time. Circuit to be used on 120V AC.

You don't give anywhere near enough information - for a start what is it to control?, what time span do the three sections need?, and what do you mean by 'a variable rise/close time' - do you mean you want it to fade up and down slowly?, and if so, is it for an incandescent light?.

This will be for an incandescent light. Yes I would like it to fade up and down. Would like to be to vary the fade time for both and the time that it stays on. The time for the 3 states would be from 1 to 5 minates.

I would suggest using a PIC (or other micro-controller), by feeding zero-crossing signals into the PIC it could do the fading up and down as well as the timing. You could do the adjustments either by buttons, switches, or potentiometers.
 
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