Timeline for Power supply oscillations when driving LEDs with microcontroller
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Sep 1, 2023 at 8:05 | answer | added | MOSFET | timeline score: 0 | |
| Sep 1, 2023 at 7:27 | comment | added | Citi | Hi Bhushan, I was first powering with a switching regulated power supply adaptor, thinking is was the adaptor I used a bench power supply but the same outcome. I tried adding a capacitor close to the power supply to the LEDs, but this did not help. Not sure why this happens since the leds are not pulling large amount of current | |
| Sep 1, 2023 at 6:59 | comment | added | Bhushan Waghe | Is your power supply is old one? if yes then might be there is any old part at output side of power supply which making such behavior. please check. | |
| Sep 1, 2023 at 6:44 | comment | added | Citi | Hi glen_geek, even when I use a regulated bench power supply I see these oscillations. Could it be how I'm driving my NPN transistor? Also, the 5v is at the end of the linear regulator clean output, I was worried that this oscillation might go through but not noticeable low-frequency oscillation like the input | |
| Sep 1, 2023 at 6:39 | history | edited | Citi | CC BY-SA 4.0 |
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| Aug 31, 2023 at 12:43 | comment | added | glen_geek | Can you describe that +9V DC power supply? For example, is it regulated actively (with transistors/chips)? | |
| Aug 31, 2023 at 10:06 | comment | added | user319836 | I don't see any oscillations. It looks more like a voltage source load regulation problem. | |
| Aug 31, 2023 at 8:53 | comment | added | Citi | I'm modulating the frequency from 0 to 50, perhaps I will place a decoupling capacitor close to the load starting with 100nf. | |
| Aug 31, 2023 at 8:48 | comment | added | Finbarr | Is this actually causing a problem? | |
| Aug 31, 2023 at 8:43 | history | edited | winny | CC BY-SA 4.0 |
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| Aug 31, 2023 at 8:32 | comment | added | winny | Please show your setup. Do you perhaps need more power supply decoupling close to your load? | |
| Aug 31, 2023 at 8:31 | history | edited | winny | CC BY-SA 4.0 |
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| Aug 31, 2023 at 8:10 | history | edited | Citi | CC BY-SA 4.0 |
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| Aug 31, 2023 at 8:01 | comment | added | Finbarr | Are they actually oscillations or just variation of voltage with load? Show us a scope trace. | |
| Aug 31, 2023 at 7:47 | history | asked | Citi | CC BY-SA 4.0 |