Firstly ... hi everybody,
i have a bit of an odd question regarding LEDs and a wall powered power source.
Basically... its for a friend who has asked for 3 "LED baseball hat lights" ( **broken link removed** ) to be wired up to a mains power source.
the "led cap lights" consist of 5 leds (super white, probably 3.3v and 25ma), these were initially powered by 2 X CR2032 batteries in series with output at 3v so i guess its a 6v to power leds.
From here on i will call each bank of 5 leds a set... so there are 3 sets of lights.
the 3 sets have already been wired together by a friend who said we only need to connect to a power source. (he said 9v... i think it should be 6v)
see picture of the internal (on spare) showing that the leds are wired in parallel...
![cap-light-(set)-internal.jpg cap-light-(set)-internal.jpg](https://www.electro-tech-online.com/data/attachments/45/45161-7409a9fa12d086c7c9b6f56376c97e96.jpg)
there are two wires.. red and black... these are soldered onto the battery terminals on the sets...
set 1 has two red connected to positive, one leads to set 2 positive and the other is connected to the power supply positive. the black is connected in same way but to negatives.
![set 1 closest to power source.jpg set 1 closest to power source.jpg](https://www.electro-tech-online.com/data/attachments/45/45162-8b6c72e05995c6160bc308aa42e2d104.jpg)
set 2 is connected to set 3 with the red (positive) going to positive terminal and black to negative. (and previously mentioned connections).
![set 2 connected to set 1 and 3.jpg set 2 connected to set 1 and 3.jpg](https://www.electro-tech-online.com/data/attachments/45/45163-34d73cace1f147eb0f7b2aafed004c14.jpg)
set 3 ONLY has the connections to set 2 with red for positive and black for negative.
![set 3 connected to set 2 ONLY.jpg set 3 connected to set 2 ONLY.jpg](https://www.electro-tech-online.com/data/attachments/45/45164-10b11daf980eb833c6075851245d13ec.jpg)
my questions are:
any help on this would be greatly appreciated.
please dont say to rebuild as this is just for prototype and so i will make a proper set of banks for friend (where i know more of what im doing, and resistor for each led!), we just need this working asap!
once again any help would be great as i just cant work this one out!![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
thanks
kielo
i have a bit of an odd question regarding LEDs and a wall powered power source.
Basically... its for a friend who has asked for 3 "LED baseball hat lights" ( **broken link removed** ) to be wired up to a mains power source.
the "led cap lights" consist of 5 leds (super white, probably 3.3v and 25ma), these were initially powered by 2 X CR2032 batteries in series with output at 3v so i guess its a 6v to power leds.
From here on i will call each bank of 5 leds a set... so there are 3 sets of lights.
the 3 sets have already been wired together by a friend who said we only need to connect to a power source. (he said 9v... i think it should be 6v)
see picture of the internal (on spare) showing that the leds are wired in parallel...
![cap-light-(set)-internal.jpg cap-light-(set)-internal.jpg](https://www.electro-tech-online.com/data/attachments/45/45161-7409a9fa12d086c7c9b6f56376c97e96.jpg)
there are two wires.. red and black... these are soldered onto the battery terminals on the sets...
set 1 has two red connected to positive, one leads to set 2 positive and the other is connected to the power supply positive. the black is connected in same way but to negatives.
![set 1 closest to power source.jpg set 1 closest to power source.jpg](https://www.electro-tech-online.com/data/attachments/45/45162-8b6c72e05995c6160bc308aa42e2d104.jpg)
set 2 is connected to set 3 with the red (positive) going to positive terminal and black to negative. (and previously mentioned connections).
![set 2 connected to set 1 and 3.jpg set 2 connected to set 1 and 3.jpg](https://www.electro-tech-online.com/data/attachments/45/45163-34d73cace1f147eb0f7b2aafed004c14.jpg)
set 3 ONLY has the connections to set 2 with red for positive and black for negative.
![set 3 connected to set 2 ONLY.jpg set 3 connected to set 2 ONLY.jpg](https://www.electro-tech-online.com/data/attachments/45/45164-10b11daf980eb833c6075851245d13ec.jpg)
my questions are:
- is this correct wiring?
- if i have a power supply of 6v (switch-able upto 12v) dc (max out 1.5 amp) will i need a resistor in place? i was told not but the leds blew! but i was also told to set at 9v...
- if i do need resistor where should it go? as it seems a mix of parallel and series
any help on this would be greatly appreciated.
please dont say to rebuild as this is just for prototype and so i will make a proper set of banks for friend (where i know more of what im doing, and resistor for each led!), we just need this working asap!
once again any help would be great as i just cant work this one out!
thanks
kielo