Brief passive buzzer controlled by 555 timer astable multivibrator set by light dependent resistor LDR circuit

Table of Contents

The passive buzzer depends on either a slow on/off change of direct current (DC) voltage to make click noises, or a fast on/off DC voltage to make a steady audible tone. The 555 timer wired in astable mode and a light dependent resistor (LDR) is an easy way to get a steady on/off square wave.

Brief circuit schematics with short video – List of pages
Become a Patron! https://www.amazon.com/shop/electronzapdotcom Subscribe! https://www.youtube.com/electronzap

Affiliate link ad.

Diagram

Simple passive buzzer controlled by 555 timer astable multivibrator set by light dependent resistor LDR schematic diagram by electronzap electronzapdotcom
Simple passive buzzer controlled by 555 timer astable multivibrator set by light dependent resistor LDR schematic diagram by electronzap electronzapdotcom

Video

Quick passive buzzer circuit using 555 timer astable multivibrator controlled by photoresistor

Next topic: Quick zener diode improved by NPN BJT emitter follower circuit – 2N3904 bipolar junction transistor

As an Amazon Associate I earn from qualifying purchases.


Home page