segment led using l7107

This circuit simulates the flashing lights of a police car, similar to those seen on British police vehicles. The operational amplifier IC1a functions as a square wave oscillator, with an adjustable frequency controlled by the variable resistor VR1 to...

Although white LEDs are common in a variety of lighting applications, their 3 to 4V forward-voltage drop makes low-voltage applications challenging. Charge pumps and other ICs are available for driving white LEDs, but they generally don't work with the...

This circuit is designed for children's entertainment and can be installed on bicycles, battery-powered cars, motorcycles, as well as on models and various games and toys. When switch SW1 is positioned as depicted in the circuit diagram, it generates...

This sound-controlled lighting circuit design is utilized to adjust the brightness of connected lights in synchronization with captured sound. The sound-controlled lighting circuit operates by detecting audio signals through a microphone or sound sensor. The circuit typically consists of several...

This circuit responds to RF signals below the standard broadcast band up to over 500 MHz and provides both visual and audible indications when an RF signal is detected. By adjusting the bias of diode D2 with the R2...

This circuit should only be attempted by individuals with a strong understanding of electronic devices. It is connected to a main power source (220V) and poses a risk of high electrical shock. This circuit operates at a mains voltage of...