help from electronics gurus? 555 timer

[beaker020]

an electrolytic capacitor is packaged in a metal can. Although, I've never seen an electrolytic under 1uF, I understand they are available as low as 0.47uF. I dont think a 0.1 uF electrolytic exists. Remember that the formula calculates capacitance in Farads. 1Farad = 1000 uFaradsIn most cases it doesnt matter what type of capacitor you use, as long as the value and voltage ratings are acceptable. Electrolytics have high leakage and their values drift with temperature. They are great for power filtering and it would work fine but for reliable timing operations I would recommmend Tantalum. I would also reccomend a 0.1 uF ceramic cap across your power rails and from pin 5 to ground.