Abstract: A luminance adjusting device for an illuminator utilizes a circuitry to control the brightness of the illuminator, wherein power is stored in a power storage through a step-down circuit. The illuminator has a preset brightness. The preset brightness is done by the calculating processor to run according to an analyzed data received from a sampling frequency circuit to control a pulse modulator for driving the illuminator to emit light. The power switch is turned off and on again shortly, which triggers the calculating processor to control the pulse modular to drive the illuminator to change the preset brightness, so that the brightness of the illuminator is controlled by the time differentials of the power switch's on and off.

Abstract: A device to detect an iron's position includes a constant voltage regulator, a frequency pick up unit, an integrated circuitry chip, a sensor unit and a control unit. The frequency pick up unit is connected to the constant voltage regulator. The frequency pick up unit includes a resistor connected to a capacitor to retrieve the frequency signal of the input voltage. The integrated circuitry chip includes a frequency producer connected with a frequency identifier. The sensor unit includes a metal ball disposed on an arc track to control the signal input of the frequency pick up unit. The control unit is connected to the frequency identifier. The frequency identifier triggers a signal to change the working mode of a transistor of the control unit.