Music Rhythm Operated LEDs using BC547 Transistors
This post presents circuit for blinking LEDs according to rhythm of the music. A microphone picks up sound waves and converts them into an electrical signal. Circuit is based on...
Circuits
Motion Controlled LED Using HC-SR501 PIR Sensor and BC547 Transistor
Motion sensors are widely used today to activate street or indoor lights, trigger alarms, activate switches, etc. This post presents circuit which turn ON an LED when motion is detected...
5 Tones Electronic Piano Using 555 Timer
This post presents circuit of an electronic piano which produces 5 tones. Circuit consists of the 5 push-buttons and when one of them is pressed, it produces the different tone...
Tick-Tick Sound Generator Using 555 Timer
This post presents circuit which generates the Tick-Tick sound through the speaker. Circuit is based on 555 timer which works in astable mode to produce a square wave output. This...
5-15V to 3.3V Converter Using LD1117V33 Voltage Regulator
There are many devices and microcontrollers which requires a 3.3V DC power supply for proper operation. This post presents circuit of 5-15V to 3.3V converter using LD1117V33 voltage regulator. This...
Police LED Flasher Using 555 Timers
There are many types of emergency vehicle lights that installed on police cars, fire engines, ambulances, etc. This post presents circuit for blinking alternately the two red LEDs and two...
Electronic Coin Toss Using 555 Timer
This post presents circuit of electronic coin toss also known as coin flip circuit or heads or tails circuit. When the push-button is pressed, the LEDs will start blinking fast....
Non-Contact AC Voltage Detector Using BC547 Transistors
When working with high voltage circuits is useful to have a non-contact voltage detector also known as tester which enables to detect the presence of voltage without direct contact. This...
Police Siren Using 555 Timers
This post presents circuit which produces a long up and down variation of the sound that similar to police siren. Circuit is based on two 555 timers which operates in...
Darkness Detector with Beep Alarm Using LDR and 555 Timer
This post presents circuit which detects darkness using light dependent resistor (LDR) and produces a beep alarm by piezo buzzer. Circuit is based on 555 timer in astable mode to...