Simple status lamp for 120 VAC circuit using LEDs
Simple status lamp for 120 VAC circuit using LEDs
(OP)
I have a DC load bank that I use often, it is operated via a microcomputer control card that is prone to failure.
I am trying to design a simple board to replace the microcomputer with 12 toggle switches to control 12 120VAC solenoids, which is what the microcomputer board is supposed to do when/if it works. The board is for backup, while the controller is being repaired or stuborn.
In my haste to simplify the problem and solution, I was reminded by a coworker that a "Pretty" status light would be necessary since people can't look at the position of a toggle switch and determine it's state...... I left that alone....
I need a simple solution to add a status indicator, the voltage is 120VAC, and I'm limited to 24-28 AWG wiring, so I don't want to alter the circuitry too much. A small device with little power consumption that turns on when the toggle is closed and turns off when open.
This should have been easy...... I read the post about the 120 VAC LED and power supply, but I need to limit the voltage drop to the solenoid and I don't want a huge power consumption to create heat problems.
Can an LED with a blocking diode and a resister in parallel achieve this? Is there a better way?
Thanks
Doorman352
I am trying to design a simple board to replace the microcomputer with 12 toggle switches to control 12 120VAC solenoids, which is what the microcomputer board is supposed to do when/if it works. The board is for backup, while the controller is being repaired or stuborn.
In my haste to simplify the problem and solution, I was reminded by a coworker that a "Pretty" status light would be necessary since people can't look at the position of a toggle switch and determine it's state...... I left that alone....
I need a simple solution to add a status indicator, the voltage is 120VAC, and I'm limited to 24-28 AWG wiring, so I don't want to alter the circuitry too much. A small device with little power consumption that turns on when the toggle is closed and turns off when open.
This should have been easy...... I read the post about the 120 VAC LED and power supply, but I need to limit the voltage drop to the solenoid and I don't want a huge power consumption to create heat problems.
Can an LED with a blocking diode and a resister in parallel achieve this? Is there a better way?
Thanks
Doorman352





RE: Simple status lamp for 120 VAC circuit using LEDs
http://members.misty.com/don/nitelite.html
If you want to spend a little, you can buy rocker and push/push switches with neon indicators built in.
Mike Halloran
Pembroke Pines, FL, USA
RE: Simple status lamp for 120 VAC circuit using LEDs
Go to any of the electrical supply places.
Or on line:
www.alliedelec.com
www.mouser.com
www.newark.com
www.ledtronics.com
I would look for switches that have built-in indicators. A light comes on in the switch when the switch is turned on. Find one that fits your present switch cutout and just replace the existing ones - no further fabrication.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Simple status lamp for 120 VAC circuit using LEDs
Don't forget:
1: a rectifier/diode in antiparallel to the LED to provide a path for the negative "wave".
2: a series resistor to limit inrush current when switching on.
3: a resistor in parallel to the capacitor to discharge it when switching off.
Best Regards,
Benta.
RE: Simple status lamp for 120 VAC circuit using LEDs
Could be such a simple thing as transients from the solenoids that upsets the board or kills one of the drivers.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Simple status lamp for 120 VAC circuit using LEDs
Benta suggestion might also include.
4. Do not use a polarized capasitor.......
RE: Simple status lamp for 120 VAC circuit using LEDs