My son needs me to make a pulsating light circuit... I have no idea how to wire something up

I have found this module - https://www.ebay.co.uk/itm/Breathin...s-and-models-railways-etc-3-12v-/335362572472

For a complete idiot - how do I wire this? I was planning to wire a 9V battery to the +/- side and then I would like to wire about 10 LEDs on the other side,...

can things be wired up like this extremely bad diagram ive made? or does it not work this way.



also are these LEDs the type i need - 25pcs 5mm LED Kit 9V-12V 20cm Pre-Wired White Red Green Blue Yellow Diode Kit Lamp Decoration Light Emitting Diode Pre-soldered

thankyou so much for the advice. i realise this is simple to most people

 

Wire up to three leds to this PCB and they will fade in and out (breathing). Handles input from 3-12v. Please note the output voltage/current is the same as the input.

From this description, it sounds like it is simply switching the input voltage directly to the outputs. If you put 9V on the input and connected an LED to the output, the LED would die a quick death.

I would start with one LED in series with a 1K resistor and see what happens.

 

From what I read in the specs ("Current control is not included on the board, so make sure you use resistors on the outputs."), you cannot use raw leds but should limit the current with a series resistor in each led (per post above).

The 9-12V LEDs you have found will incorporate the necessary current limiting resistor so should work ok as is.

 

Argh. I did not look at the LED link. Yes, those appear to be wired with a resistor, so they can be wired directly. Test one by connecting it directly to the battery.

 

I was planning to wire a 9V battery to the +/- side and then I would like to wire about 10 LEDs on the other side,

Standard 9V batteries will not last long. Especially trying to drive 10 LED's. A 12V SLA battery (Sealed Lead Acid) will have more power and last a whole lot longer on a charge. Also, if it's left on the SLA battery won't suffer damage from being overly discharged once in a while. Too often and the battery plates can sulfate, which will reduce the ability to deliver current.

 

Argh. I did not look at the LED link. Yes, those appear to be wired with a resistor, so they can be wired directly. Test one by connecting it directly to the battery.

thankyou so much for your reply (and to everyone else who replied).

Ill order the parts as I listed then as most seem to agree they will work.

1. Would the way ive drawn the wiring work?
2.The LEDs I linked say they are suitable 3-6V.. or 12v.Im using a 9v battery... which do I choose?

 

You are proposing to connect multiple leds in parallel across each output. A possible issue is that several leds across each output will draw more current than the board can provide and overheat the output transistors.

Without actual specs for the board to check against, it would be safer to use 12V leds with your 9V supply as this will reduce the loading somewhat and improve your chances of success.