HIT Switch - Engineering Projects

Description

This Hit Switch is the electronic equivalent of a conventional switch. It can be used to control the switching of a variety of electronic devices. The Hit Switch Engineering Projects circuit of the hit switch uses a piezoelectric diaphragm (piezo buzzer) as the hit sensor. A piezoelectric material develops electric polarization when strained by applied stress. The hit sensor makes use of this property.

The Kit of the Hit Switch Engineering Projects uses a piezoelectric diaphragm (piezo buzzer) as the hit sensor. A piezoelectric material develops electric polarization when strained by applied stress. The hit sensor makes use of this property. When you hit or knock the piezo element (hit plate) with your fingertip, a small voltage developed by the piezo element is amplified by transistor BC547 (T1). The combination of transistor T1 and the bridge rectifier comprising diodes D1 through D4 acts as a voltage-control switch. The inverter gates of IC CD4069 together with associated components form a bistable switch.