the alarm circuit and implemented on the circuit board 38 is illustrated a positive power input is supplied to the circuit through a diode 62 the anode of which is connected to the positive power input the cathode of the diode 62 is connected to one side of a resistor 64 to one side of a resistor 66 to the emitter of a pnp transistor 68 to one side of the audio transducer 44 and to a resistor 70 the other side of the resistor 64 is connected to one side of a resistor 72 to one input of a two input nand gate 74 and to one side of a capacitor 76 the other side of the resistor 72 is connected to the electrical contact 48 the other side of the capacitor 76 is connected to the electrical contact 46 to the reset spring contact 56 and to the negative side of the power supply the other side of the resistor 66 is connected to one input of a two input nand gate 78 and to the contact 58 the output of the two input nand gate 74 is connected as the other input to the two input nand gate 78 the output of the two input nand gate 78 is connected as the other input of the two input nand gate 74 and to one side of a resistor 80 the other side of the.