set logic high or 8 volts at pin output at the same time positive electrons will charge to c 3 28 when voltage in c 3 28 is reach u2154 of 8 volts the ic lm555n 25 will finish its function and set pin output back to logic low or 0 volt during pin output is logic high or 8 volts if rolling switch 4 or temperature switch 3 b one or both being self connected to ground line pin reset of ic lm555n 23 goes logic low or 0 volt the ic lm555n 25 will stop its functions by set logic low or 0 volt at pin output time can be set for delay cooking time by timer switch 18 first selection positive electrons will charge to c 3 through r 3 31 second selection positive electrons will charge to c 3 through r 3 r 4 32 third selection positive electrons will charge to c 3 through r 3 r 4 r 5 33 the ic irf 510 24 has three pin gate source drain pin source is connected to ground line pin gate is connected to pin output of ic lm555n 25 there is a temperature switch 3 a and safety door switch 8 connect in series with pin drain of ic irf 510 24 and one coil terminal of relay 25 there are two wires are connected to battery 39 s terminals 20 one for positive polarity one for negative polarity a main fuse 40 amperes 21 is connected in series with positive main line to protect shorting a main switch 6 is used for turn on power for pc board or the electronic control unit a voltage regulator ic 78l08 22 has three.