Subscribe by email

Simple 555 timer circuits

Free simple 555 timer circuits electronics projects with explanation and diagrams. Huge collection of electronics projects based on the 555 timer circuit or equivalent integrated circuits.

Photoelectric Smoke detector

An very simple smoke detector circuit can be constructed using a 555 timer circuit and a photo interrupter . The photo interrupter module is used as the smoke detector, while timer 555 is wired in astable configuration as an AF oscillator for sounding alarm via a loudspeaker.

555 timer circuit electronic key code lock

A very simple electronic key code lock circuit that require few external components can be constructed using this schematic diagram . This electronic key code lock circuit is based on a common 555 timer circuit and some other common components .

555 timer Piezo alarm circuit

A very simple piezo alarm circuit which will generate a sound around 110dB can be designed using this diagram.


Subscribe to RSS - 555 timer circuits