About this document
Touch Sensitive Alarm with 555 Timer by rockettrooper21 is a document available to read on EtoBox.
This document describes a touch sensitive alarm circuit using a 555 timer IC. The circuit activates a buzzer alarm when an object with an electric charge touches the circuit. It uses a 555 timer IC, BC547 transistor, buzzer, momentary push button switch, and resistors. When touched, the circuit produces a negative pulse that sets the internal flip-flop and turns on the output to the buzzer. A transistor keeps the output latched even after touch is removed. A push button is needed to reset the circuit and tu
- Author
- rockettrooper21
- Language
- EN