There are different types of circuits that produce different kinds of sounds. Here is a simple circuit that produces wailing siren. The main principle of this circuit is to produce a wailing siren. The 555 timer IC is operated in astable mode. When the switch is pressed, speaker produces high pitch siren and when it is […]
Stun Gun Circuit
CAUTION: Before going to explain about this concept, we are going to strictly suggesting that DON’T TRY TO IMPLEMENT IT PRACTICALLY AS IT PRODUCES VERY HIGH VOLTAGE. A stun gun is a gadget used to produce a high voltage, low current signal, used mostly as a weapon to stun or send shock waves to the […]
TV Transmitter Circuit
Have you ever thought of transmitting audio and video signals? Here is the simple circuit that amplifies and transmits audio, video signals. These are transmitted in very high frequency band (VHF). TV Transmitter Circuit Principle: The main principle of this circuit is to transmit the audio and video signals. Here audio signals are frequency modulated […]
LC Meter Circuit using 555 Timer
An LC meter circuit is used to measure value of a reactive element like a capacitor or an inductor. This article describes the design and functioning of a simple circuit using a 555 Timer and a microcontroller. An advantage of this circuit is its simplicity and accuracy. LC Meter Circuit Working Principle: The LC meter […]
High and Low Voltage Cutoff with Delay and Alarm
This circuit protects the costly equipment like TVs, air conditioners, Refrigerators, etc. from high voltages as well as low voltages. If the supplied voltage is abnormal (High or low) then the circuit automatically turns of the load. This circuit also produces sound when main power resumes. Generally voltage stabilizers are used in this type of […]
Super Sensitive Intruder Alarm
This circuit is designed to alert the user when an intruder enters into the home. If there is any obstacle in front of IR sensor, it generates an interrupt signal. This interrupt signal is given to the speaker to alert the user. Super Sensitive Intruder Alarm Circuit Principle: IR transmitter always emits the IR (Infrared) […]
Ding Dong Sound Generator Circuit
Nowadays, door bells are very common in every house. We daily observe different types of door bells are available in the market and they produce different types of music depending on their functionality. One can design their own door bell using simple electronic components. This article explains a simple circuit that produces “ding dong” sound […]
Automatic Changeover Switch
Many electrical and electronic appliances require DC or AC power for their operation. While AC power is made available mostly through AC supply mains, DC power is made available through batteries. However there are circumstances when there is a scarcity of AC power (through power failure) or DC power (due to limited lifetime of batteries). […]
Reverse Parking Sensor Circuit
If you are a new driver then it is very difficult to judge the distance while parking the car. Reverse parking sensor circuit solves this problem by indicating the distance with the help of three LED’s. We can easily arrange this system at the back side of the car. This system operates with 12V rechargeable […]
Dummy Alarm Circuit
Have you ever heard about dummy alarm? This is similar to the alarm but this flashes high power Red LEDs for every 5 seconds. This article describes the circuit of dummy alarm. Dummy Alarm Circuit Principle: The main principle of the circuit is to flash an LED for every 5 seconds. The circuit consists of […]