Timeline for Is this 12 volt LED circuit correct?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Jan 22, 2015 at 6:13 | comment | added | alphasierra | 6. Yeah, get rid of that. That's dangerous. 8. The whole point is that a switching constant current regular it doesn't dissapate the power. Look up the difference between a switching and linear supply. | |
| Jan 22, 2015 at 6:07 | comment | added | alphasierra | 3. Voltage isn't the whole story. Power is the real parameter you're interested in in this case. | |
| Jan 20, 2015 at 6:16 | comment | added | Fraser Dunn | If you put your computer mouse over the "circuit" tag a response of "This tag is nearly useless. ..." I think this is an exception. Don't you think? I love studying other people's design schematics. | |
| Jan 20, 2015 at 6:00 | comment | added | Fraser Dunn | Much thanks alphasierra for your detailed input. Glad I asked all those questions I learned so much! Drawing Amps, use a constant current LED driver, limit those Amperages, check project for heat dissipation and a fan no matter the voltage required, power supply should NOT get hot when there is NO load, refreshing my mind and setting my mind on electronic parlance words, “555”, “potentiometer”(not heat efficient here in this project),“foreward drop”,”FET”, ectcetera. | |
| Jan 20, 2015 at 5:59 | comment | added | Fraser Dunn | You could use the Q and /Q outputs of a 555 to drive some FETs to alternately run two separate circuits. >>> 8. I was hoping alphasierra you would say that. | |
| Jan 20, 2015 at 5:58 | comment | added | Fraser Dunn | 8. I would need to look further as to why a constant current regulator would be more efficient in dissipating heat as a potentiometer. MOSFET and a 555 timer sounds good for a dimmer although I wonder if switching on/off repeatedly damages the LED bulbs and/or any other components. Money, Expenses is all part of design. Even 4 cents saved daily multiplied by a manufacture of 10,000 units is $14.64 per unit per year. Total $146,400.00 saved for the world. | |
| Jan 20, 2015 at 5:56 | comment | added | Fraser Dunn | No. There's a 100x difference between the two. 7. That’s a simple answer. Been a long time since I constructed a project. | |
| Jan 20, 2015 at 5:55 | comment | added | Fraser Dunn | 6. It’s an old power supply for an outdated portable analog TV. It literally can cook food during operation. Burns my hand holding it to the point I have to let go of it. | |
| Jan 20, 2015 at 5:55 | comment | added | Fraser Dunn | 5. Thank You this is IMPORTANT! Amperage is increasing. Need the right power supply to fit the amp loads! | |
| Jan 20, 2015 at 5:54 | comment | added | Fraser Dunn | 4. That looks to me like a compete answer thank you alphasierra: components specification(design), environment(hot, humid, wet, dusty, lack of air flow, electronic components near a hot electronic component, an earthquake 11.0, etcetera), heat sinks(wire grade, parts grade). | |
| Jan 20, 2015 at 5:53 | comment | added | Fraser Dunn | 3. I’m surprised to learn that even a 12 volt project may require a fan. I therefore presume that even 1.5 volt projects such as a wrist watch may need a fan. Must look a little further into this topic. | |
| Jan 20, 2015 at 5:52 | comment | added | Fraser Dunn | 2. Thank You alphasierra I shall aim(plan) to add a constant current LED driver to the schematic. This will keep the LEDs at “proper” illumination and emitting colour. | |
| Jan 20, 2015 at 5:51 | comment | added | Fraser Dunn | Depends on what the LEDs are rated for. The left branch LEDs have a forward drop of 11.8V, and the right branch drops 10.8V. The limiting resistors at the bottom of each branch should restrict the current to 1A, so make sure your LEDs are able to handle that current. >>> 1. Thank You alphasierra I shall make sure the LEDs that I purchase have this restricted to a certain amperage such as 1A. | |
| Jan 19, 2015 at 7:17 | history | answered | alphasierra | CC BY-SA 3.0 |