Water triggered alarm system using 555 circuit

This circuit employs a 555 timer configured in bistable mode. Activating T2 results in a high output, causing D2 to conduct while D1 turns off. Conversely, activating T1 leads to a low output, with D1 conducting and D2 being cut...

Inverting monostable circuit diagram

The timer 555 is activated by a positive trigger pulse, which results in negative output pulses. In scenarios where the duty cycle exceeds 99%, heavy loads can be disconnected from pin 7 without impacting timing accuracy, although loads exceeding pin...

Time delay circuit (555)

A very regular configuration of the 555 astable timer to work as a timer to trigger an alarm or any other equipment connected to pin 3. R resistor should be replaced with a potentiometer that will change the time delay....

Push Off Push On

The widely used 555 timer is utilized in a bistable configuration that employs a simple push-button for a push-on, push-off action. This configuration operates on the principle of maintaining a stored charge in a capacitor, which manipulates a Schmitt trigger...

Reflex Timer Circuit

This timer circuit utilizes a 555 IC timer in conjunction with three 74LS193 counters to control an LED display. The circuit is activated by one individual who turns on the piezo buzzer BZ1 through Q1, simultaneously starting the timer. The...

555 organ circuit

This schematic illustrates a simple 555 organ circuit, which consists of two main components: the 555 timer circuit that generates tones and an LM386 amplifier for driving an 8-ohm speaker. The circuit produces slightly different tones when each switch, labeled...

Siren Circuits using timer 555

This month I am making 3 different types of siren circuits based on the 555 timer. The first circuit simulates the siren of a British police car. It uses two 555 timers in the circuit. The 555 on the right...

555-Circuits

This circuit is a simple -5V power supply using a 555 timer, designed for low-power analog applications involving FET operational amplifiers. The circuit converts +5V to -5V to create a dual power supply. It operates as a 555 astable multivibrator...

9 Second Digital Readout Countdown Timer

This circuit provides a visual 9-second delay using a 7-segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9, and the 555 timer is disabled with the output held high. When the switch...