/diy/ - Do It Yourself

>>816106

dont use a higher-wattage pot, your circuit is the problem. pin 7 of the 555 is used to discharge the timing cap. it does this by essentially shorting pint 7 to ground when appropriate. if your pot is at the min value, you're shorting it across the power supply which will cause it to burn. solution: put a fixed resistor in series, like 1K, which will limit the max current thru the pot to Vcc/1000.

this is one of those things that are often omitted from schematics coz it's assumed you know it. sucks if you dont.