An adjustable hanging apparatus for blind valances is provided. Charge held in the capacitor element according to total voltage of voltage corresponding to the threshold voltage of the transistor and image signal voltage is once discharged through the transistor, so that variation in current flowing in the transistor or mobility of the transistor can be reduced. In a single run, the apparatus provides for perforating a wellbore and squeezing cement through the perforations and into the formation therearound.