# GianlucaG1

• GianlucaG1 commented on jollifactory's instructable JF Time Fountain

You could make the same without a strobe light, modifying the phase of the droplets: after 8 droplets at the same T time spacing, wait 90% of T, a droplet, then 8 droplets spaced by T. :)

• You need 20V by a step-up converter??? Why? You can simply compare a fraction of the battery voltage! :-)

• Please also note that the calculated capacity is the BATTERIES capacity!If you would use some new 2,4Ah batteries, you would have: 12x2,4=28,8Ah; considering a medium voltage of 3,7V: 28,8Ah x 3,7V = 106,6Wh.What is the converter efficiency? 85%? 106,6 x 0,85 = 90,6Wh.Output voltage is 5V, then: 90,6Wh / 5V = 18,1Ah. If the phone internal charger is a linear device, you can charge batteries for about 18Ah.

Please also note that the batteries shall have the same voltage when they are connected in parallel, otherwise dangerous high currents can flow!

• GianlucaG1 commented on Matlek's instructable Universal Arduino Remote

You should use absolute encoders, so you would have a code for each position.

• LEDs have to be powered by a current regulated power supply (a LED driver). Voltage drop get lower when a LED become warm, then current increase also if voltage applied is perfectly constant!

• Please note that D6 and D9 are drawn with inverted polarity!Please also note that the output on/off switch doesn't switch off immediately, because output capacitors are not immediately discharged. You should put the switch after output capacitors.

• GianlucaG1 commented on How-ToDo's instructable Powerful burning Laser

but LM317 is a current regulator, then current flowing in the diode is fixed, instead the switching regulator is a voltage regulator, then current raises with the raising of temperature!

• Everything is relative... In electric engineering, 300.000V is High Voltage, but 20.000V is only medium voltage... :)In electronics, where common voltages are 1.5 - 3 - 6 - 9 - 12 - 15 - +/-15V, 100V is considered high voltage, because more than 48V is dangerous.

• Uhmm... Do you know that with port manipulation writing a decimal value on a port you obtain automatically a binary conversion?... :-)

• Parallel formula is wrong: result of your formula is 1/R!You talk about Ohm's law, but the triangle represents Watt's law! Ohm's law isV=I*R, not P=I*V.As said by BasinStreetDesign, I agree you should firstly say that parallel total resistance is lower than the lower resistor (and, for the series, total resistance is higher than the higher resistor...)

• You should try the Slim Jim antenna: it has a low angle of irradiation and you can put it in a plastic tube or hang it or make it flexible using copper shield

• How could a pulse (2mS MAX if 100%@500Hz) of the PWM discharge the 470uF capacitor via a 1k resistor??? It's astonishing, after 30 years of electronics... :-)

• I like your idea, but for safety reasons if I would have to make it I would make use of a bigger capacitor, i.e. 470uF, in parallel to the zener, and a 1k (or similar) resistor in series with the optocoupler and the gate.

I like your idea, but for safety reasons, if I would have to make it, instead of a high voltage capacitor I would make use of a bigger capacitor, i.e. 470uF - 25V, in parallel to the zener, and a 1k (or similar) resistor in series with the optocoupler and the gate.

I like your idea, but for safety reasons, if I would have to make it, instead of a high voltage capacitor I would make use of a bigger capacitor, i.e. 470uF - 25V, in parallel to the zener, and a 1k (or similar) resistor in series with the optocoupler and the gate.

I like your idea, but for safety reasons if I would have to make it I would make use of a bigger capacitor, i.e. 470uF 25V, in parallel to the zener, and a 1k (or similar) resistor in series with the optocoupler and the gate.

• It's very annoying...

• >> If your coil is a dumbbell type instead of toroid you will also reduce the EMI.Why?... Toroid is closed! Dumbbell (drum) is open...