Remote controlled corona protection device specially for children

This remote-controlled project uses a 9V battery as its primary power source, which is regulated down to a stable 5V using an IC-7805 voltage regulator, supported by a 1000uF 25V capacitor and a 0.1 uF capacitor to smooth out power supply fluctuations and filter noise on the breadboard. The system operates via a TSOP1738 IR Receiver, which detects incoming infrared signals from a remote control. When an IR signal is received, it triggers a timing sequence managed by a 555 Timer IC configured to maintain an active state for a specific duration. The output from the 555 timer drives an IC-ULN 2003 darlington transistor array, which acts as a current amplifier to safely switch a 5V Relay. This relay controls the load circuit containing a buzzer and an LED, which activate simultaneously to provide both audible and visual alerts. The circuit timing and sensitivity are tuned using specific passive components, including a 15K ohm resistor, an 18K ohm resistor, and a 1K ohm resistor, which together establish the correct biasing and timing parameters for the timer and driver stages.