All Questions
8 questions
2
votes
1
answer
128
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What size should I select for the resistor? I have led and SSR and 24VDC source [closed]
Could you please clarify this circuit with me? I have selected 90 ohms. Please let me know if I need to do something differently here.
R=(24-30.3)/20mA= 1035ohm and I select 1Kohm
I appreciate any ...
- 21
0
votes
0
answers
233
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Running a 3D printer, LED strip, and fan from a 24V PSU
I am working on a project to design an enclosure for my 3D printer. The enclosure is designed, but I am looking for some guidance/suggestions on the electrical side. I plan to add a few strips of 24V ...
1
vote
0
answers
91
views
LED circuit with an AL1793
I'm currently making my own light fixture, a multicolor Par light to be exact (and a few other types once this is successful). Now I'm trying to control a string of 6 multicolor LEDs. The circuit will ...
- 103
0
votes
2
answers
90
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Replacing LEDs connected to 24 VAC
I need to replace 2 blown LEDs in a keypad module. They are connected in series with a 240 ohm resistor to a 24 VAC supply. What LEDs should I choose? Something with a forward current of 100mA? Do I ...
1
vote
1
answer
408
views
Arduino RGBW 24v LED strip driver
This might not even be the right place for me to ask, but I hope somebody can help;
I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
- 11
0
votes
2
answers
4k
views
24V signal switching optccoupler
We have a robot, and it has 32 digital output, fed into a homemade PCB.
On the PCB we have optocouplers, which have a forward voltage around 1.2-1.3V.
So I need to drop the voltage a lot. That's why ...
- 121
0
votes
1
answer
1k
views
LED driver putting out more voltage than rated?
The Background
I bought a 200W magnetic LED driver with hopes of replacing the 40W Philips-supplied driver that came with my set of Hue Lily outdoor lights. Each fixture requires 8W at 24v. This new ...
- 103
2
votes
3
answers
1k
views
PWM Dimming 24v with 3.3v input
I am trying to dim a 24v led-strip with a 3.3v PWM-signal coming out of a ESP32. Currently I have this circuit:
But there is one problem. It works for dimming till ~40%. But when I turn the PWM off, ...
- 39