adequate pull-down resistor value

[r0nd0m]

Clarify that "...all that EMI to the ground..." sentence.... which EMI, Where?

I think I have told you that already in the first post. When I connected the osciloscope on the led I found so much "noise" in the wave form. The circuit is suposed to generate some frequencies that will blink the 3W leds... So if you look at one led with the osciloscope, you will see a square waveform, of maximum amplitude of 5V and minimum amplitude of 0V. Due to the noise (the EMI/RFI not ESD sorry for that) the wave form gets messed, mainly during the 0V period of the waveform.. the noise creates some pikes on the 0V periode wich ones gets close to the 5V... enough to activate the TIP122 cause its gain is really high (10000). So even with the circuit completly turned off, that noise makes the leds to blink.

Your base resistor is a tad high (well... for a purist)

Yes I know.. you will crucify me but I didnt take much care of it..

Are you aware of TIP122 internal resistors?

Yes I heard about that... as it seems, they arent sufficient for preventig that damn noise..

R2 shouldn't be needed

Yes I think the same but that thing is the only thing that solved my problem..
It sends to the ground all the EMI/RFI issues that circuit may suffer.. As far as I know..

Did you try a capacitor instead of R2?

I was afraid of using a capacitor cause it could drawn my frequency, so I chose the resistor to send it to dust!

Thanks for posting your solution here with as this much details, all forum member and reader will learn a lot from it

Im sorry for taking that long time for answering, I dont wanna be selfish mr e, I just cant explain better it takes me a really long time to translate.. -> bad english, remember that!

Ty guys, hope this thing can be useful.
Cya soon!