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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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13th October 2003, 08:16 PM
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 555 Timer Not Working Correct Hello I have built a 555 Astable circuit (if anyone has livewire it is the 555 circuit from there) I built the circuit but not having any potentiometers/var resistors around i used a 20k fixed resistor instead. Now i have also not got the top led in place but have one connected from the output to negative with a 560 resistor after it (didnt have a 680 around) And the problem is ...the led comes on ...but it doesnt flash! Any Ideas? Also what is the "charging" connection for? Thanks Kane | |
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13th October 2003, 09:28 PM
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| aha!!! how silly of me ...im soo ashamed  ops: the power supply i am using (i dont think its a clean source) it is from an old (very old) train set rated at 12 volts.... so i put a 100uf capacitor over the contact and guess what!!! the circuit works :P lol now is this becuase of the power supply or was the circuit flashing because of the capacitor? i dont quite understand what i did ! lol Could someone please explain? Kane | |
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