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Yes ,correct ... Still due to the fact that Arctic Silver 5 has a non-silicon carrier ,and from what I've noticed it is of an evaporative nature (paste eventually turns into solid film ),I tend to let it cure ,without any thermal load. Applying thermal load may cause sudden "bulk evaporation"...

It means you should wait for 8-10 days before switching ON the LEDS/ COBs for more than 10-15 minutes ... Even at lowest power possible ... Let it cure first ...

Please Master ... Stop givin' so much pain ... :lol:

I'll be waitin' for the " yield & quality " report of yours ... ;) Cheers. :peace:

" Contact resistance " is the key ...;) Or also known as " AN : How to make a highly thermal conductive paste ,behave worse than the worst toothpaste, by using Kapton tape " Cheers,brother. :clap: P.S. Many-many Thanx to you ,for the LM2907 advice . You saved my day ,once again. ( Can you...

Extra corrosive power LOL ! Graphite -based TIMs also ,should not be used with aluminium heat sinks ..

Personally ,with the experience I've gained so far while making LED grow lights , when it comes to Thermal Interface Materials ,the first of all the rest characteristic I look for is how easy it is to apply the TIM in a really thin layer ( 1/10 of millimeter= 100 microns ,being the thickest...

Yes .. http://www.led-professional.com/products/led-thermal-management/fischer-elektronik-introduces-new-wlpk-heat-conducting-paste But way expensive (at least here ...) Almost 22 Euros ( !!! ) for the 3 ml syringe ... http://www.marelectronics.gr/products.php?id=27947&lang=en While ...

For six years ( 2008-2014 ) best ( non-conductive & non-corrosive ) thermal paste , was GC Gelid Extreme ,according to many tests done . But GC Gelid Extreme is a real PITA to apply in a thin layer . (At least for me ... ) Best thermal paste for year 2015 is considered to be, the new Kryonaut...

Here you can read more info http://www.ti.com/lit/an/snaa088/snaa088.pdf Check pages : 4 -5 -8 & 9 .. The LM2907N-8 used in the circuit presented at this thread is "wired " as a "simple speed switch " ** with the selected values of 200 K resistor and 2x 100nF timing caps - connected in...

Yes ,just look at the pics ,towards the end of the previous thread's page .... Gerber no ,I'm afraid ...Just DipTrace files ...(and then you can convert to gerber files ...I think ... ) -Three separate fans = three separate circuits ,with their AC outputs connected in series .. If one of...

I can see any big difference on creating an AC line versus connecting AC wiring to an pre-made AC line (of the relay shield ... ) Anyway ...You might be right .. I should give more info about it ... As for the shield ,yeap ,it seems alright ... Regarding making an AC line in DIY PCB ,the trace...

Let me think .... 3$ " nano arduino ebay thingy " versus 4$ just for the original Texas Instruments LM2917N-8 ... Safer ,absolutely not ..Cheaper yes ... Easier yes ,might be ... 1-2 $ optocoupled relay shield ....? Brother , a good DPDT relay cost 3x the price .... Cheaper and easier yes ...

Fan fail protection for a single driver : Just use the "first-half " of the whole circuit ... Like that ... Cheers.

Never will be enough..... No matter how much you'll put ... That is why CREE does NOT suggest any Kapton tape ,or any "Vaccum properties of TIM " as securing and installing COB arrays in place .... But hey ....WTF do I know ? Use the damn tape .... Just make sure to replace it every couple of...

Just for informative purposes ,except the easy way of perforated board , a blank PCB can be used and with the method of " laser printer toner transfer " ( plenty vids on YOUTUBE ,about this technique ) ,a more " clean" result can be obtained . Still it needs etching and drilling the holes onto...

Nope .... COBs deviated me ... ( Thank God ,they did so ... ) Cheers.

Unfortunately Fran ,casted aluminium is more like a "sponge " .. It is full of bubbles. (trapped atmospheric air ,Hydrogen and other gases ),thus having poor thermal exchange properties . Casting melted aluminium ,is not the way to make heatsinks ... Nevertheless ,those vids are pretty...

And -lastly - a small "show off " of how this circuit operates ... In the above pic you see those things : On left ,the orange colored unit is a 12 VDc PSU . Let us assume that this is the FAN PSU . On top of it a 4-wire fan is placed ( My favourite ,super silent & super powerful PHANTEKS...

And here's a bit reworked design of the circuit ... (more compact size ) Given dimensions are in millimeters. Inside the zip folder ,the diptrace file ... ( Download freeware edition of DipTrace link : http://diptrace.com/download-diptrace/ Choose : " All features and libraries, 300 pins...