| Electronics > Beginners |
| Trying to understand voltage divider circuit |
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| Jwillis:
You can use a LM78xx series voltage regulator.If you need 5Volts A LM7805 is all you need and they're really easy to use and cheap.http://www.mouser.com/ds/2/149/LM7812-461970.pdf |
| Fungus:
It's very simple: The resistance of the part I drew the circle around is not equal to R2 therefore the voltage at the point in the middle won't be whatever the result of a calculation done with only R1+R2 gives you. |
| IanB:
--- Quote from: Youkai on April 26, 2018, 04:16:14 am ---Started looking into the power supply for this project. Went to the local thrift shop and found a wall adapter from something that supplies 12VDC and 500mA. My RGB LED strip runs on 12v. Also got a food saver vacuum that runs on 5v but I scavenged the barrel plug from that so I can have something to plug into. Pulled the plug out of the sealer and connected it to my adapter. Was able to power the segment of LED strip using this setup. Yay! Now I just need to get a voltage regulator and some transistors and start working on a circuit diagram. --- End quote --- While you are in the thrift shop, or anywhere else you can scavenge stuff, look for a 12 V USB adapter for use in automobiles. This contains a module that will take 12 V in and give a regulated 5 V out. If you are anything like me, you may have such a thing lying around in your junk pile. |
| paulca:
What kind of LED strip. How long? How many LEDs and more importantly how much current is needed? The RC component is probably a BEC (Battery eliminator circuit) usually a regulator 6V or 7V from 12-24V module for powering the radio gear from the main motor power pack LiPo. |
| Youkai:
--- Quote from: paulca on April 26, 2018, 06:47:09 am ---What kind of LED strip. How long? How many LEDs and more importantly how much current is needed? --- End quote --- It's going to be two of the segments of this: https://www.superbrightleds.com/moreinfo/flexible-led-strip-lights-color-changing/rgb-led-strip-light-flexible-custom-length-led-tape-light-with-9-smds-per-ft-3-chip-smd-led-5050/3502/ See this post for more information on the project: https://www.eevblog.com/forum/projects/borderlands-style-jewelry-box-research-thread/ |
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