I have a setup of 6 RGB diodes in parrallel, each diode has seperate resistors for each color.

My problem is, when i connect the diodes on a 12v supply, all leds and every color works, but when i connect the diodes on my speakers, green and blue dont work on 1 diode, red works on all.

What could posibbly cause this problem? If leds work normaly if connected to 12V, but 1 doesnt work if connected to speaker.


closed as unclear what you're asking by winny, PeterJ, Voltage Spike, nidhin, JYelton Oct 10 '17 at 17:10

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    \$\begingroup\$ Why on earth are you connecting LEDs to speakers? \$\endgroup\$ – Polynomial Oct 8 '17 at 16:35
  • \$\begingroup\$ Thats besides the point but yeah.. i want them to "puls" by the beat. And yeah i know thats not how you do it but ok... \$\endgroup\$ – FlawlezzJaxy Oct 8 '17 at 16:37
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    \$\begingroup\$ Use the schematic editor that comes with this site and add two schematics: (1) The 12 V schematic; and, (2) your speaker schematic. I think that if you put some work into your question here, that you will get some work back in the form of a useful answer. \$\endgroup\$ – jonk Oct 8 '17 at 16:48
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    \$\begingroup\$ It would be the considerate thing to do as it would require less guessing on our part, fewer questions, etc. It's up to you, though. You do what you want. \$\endgroup\$ – jonk Oct 8 '17 at 16:54
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    \$\begingroup\$ There is a schematic button on the editor toolbar. It's easy to use. You need to supply part numbers and links to the datasheets for the LEDs. \$\endgroup\$ – Transistor Oct 8 '17 at 20:09

Your RED are probably not working at full current and BG may be backwards damaged or just not enough audio power, but have 50% higher voltage threhold.

To get the same brightness, they have to be equally efficient and with 12V into 8 Ohms that is 18 watts of audio power.

If they are not ESD protected or back-front connected inparallel, then worry about reverse V damage>-5V

  • \$\begingroup\$ This is an interesting answer. 1. Red leds seem to work at full power almost all the time. Its the first time i hear about backwards damage, it could be a posibility. 2.I tried changing volume to max still one diode didnt work. 5 leds work 1 not, i do not think its a problem with power. But the waird thing is that on 12v all 6 GB work. 3. How to know if they r ESD protected? How does backfront parrallel look like? 4. I fixed it by changing the one diode and now all 6 work on audio. But im interested to know about ESD and reverse V dmg \$\endgroup\$ – FlawlezzJaxy Oct 8 '17 at 17:41
  • \$\begingroup\$ MOST LEDs are not ESD protected unless there are two Leds , 1 for each polarity. I only buy ESD protected types when avail. Others can add a shunt diode in reverse across each Light Emitting Diode. ( What/where was that one diode?) \$\endgroup\$ – Sunnyskyguy EE75 Oct 8 '17 at 17:56

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