audioguru said:
Haven't you learned about power???
Voltage times current equals power. Power in an electronic device creates heat. If you have a 12V supply and the output voltage of the 555 is 9.5V, then 9.5V x 200mA= 1.9 Watts which is a lot of heat for a small resistor.
sorry, sometimes i can't differentiate well them. 1.5 watt is a lot of heat? then how many watt isn't? so i have to remain the 100R and to limit the current, the 200mA is to large.
CAT 5 cable is common here and it is cheap. Use multiple wires from a telephone cable instead.
the CAT 5 cable can be found in electronics shop or computer shop?