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One more requested test on adding smoothing to the driverless LED.   This version puts a lot less stress on the current regulating chips.

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Another capacitor test on the driverless LED.

Another requested test. Putting a 10uF 400V capacitor across the LED array on the driverless 20W LED. This required a little silicone surgery to gain access to a concealed track. The result was actually quite good, and got rid of the real harshness of the flicker.

Comments

iamdarkyoshi

Looks like my suggestion works :D I'm going to get some of these and probably make this mod. I'm going to try an NTC inrush limiting resistor instead nabbed from pretty much any switchmode power supply of modest power

Anonymous

What happens with 1uF or 5uF capacitor ? Also why not use tantalum SMD caps, won't dry and won't overhang.

bigclive

The capacitor has to be rated for a modest voltage. In this case I made it suitable for the full open circuit voltage.

Anonymous

Thanks Clive - very interesting extra video, I hope the Chinese manufacturers watch your videos before the market is flooded with these new driverless designs! I had a thought about putting a resistor in series with a capacitor to prevent the current spike of an empty capacity charging and the affect it has on how well the capacitor functions in the circuit... Can you use a resistor to prevent current spike on charging a capacitor as you have done here, but then have a Diode across the resistor in reverse polarity so that the capacity can still discharge through the diode without seeing the resistance of the inrush limiting resistor? If so - would that allow the capacity in your above video to smooth the LEDs better than it was able to with the resistor?

Al Hunt

Nice. This is why I'm a Patreon. I really enjoy when you dig deeper into these things.

Anonymous

Nice satisfying "click" when you shorted the capacitor. 👍

Al Hunt

Even more satisfying if he'd shorted it with his tongue. Oh, wait, no. That's ElectroBOOM's channel.