Led circuit help
Led circuit help
(OP)
Sorry for my handicap in electrical circuits. I have a 24Vac circuit that I need an led to turn on and off at specific voltages. The voltage will start out at 0VAC as voltage rises to 24vac I need the led to turn on at around 21.6vac. If voltage falls I do not want the led to turn off until it reaches 19.5vac. If anybody can help with this problem it would be appreciated.





RE: Led circuit help
As you seem to be in an idustrial environment from your login handle, you may get (almost) exactly what you want off the shelf if you Google "trip amplifiers". Various companies make them in rugged packages which have standard mounting formats such as DIN rail, etc. You may have to rectify/smooth your a.c. signal to d.c. for an input signal though.
If you really must build this as a home grown circuit you should realise it's failry complex topic and could get difficult to discuss here from first principles. Start by Googling for operational amplifier comparator circuits. There are various ways you can use one or more op-amps with hysteresis to trigger or trip at a certain voltage. You can build a "window detector" with two comparator circuits, which covers the voltage range you want, programmed with different value resistors.
RE: Led circuit help
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RE: Led circuit help
RE: Led circuit help
What is the maximum limit of current draw allowable from your AC signal for this solution ??
RE: Led circuit help
RE: Led circuit help