This project is about a basic toggle switch circuit utilizing a CD4017 IC. With this circuit, any AC or DC electronic device can work with a push button. The circuit can also be utilized in … Read more
2n4401
A Beeper circuit is a simple but sophisticated electronic device that produces a monotonous beeping sound which can be used for alarming or indication purposes in places such as hospitals, police stations, or Fire brigade … Read more
Simple Beeper Circuit Using CD4011 2-Input NAND Gate IC
2N4401 Pinout 2N4401 Pin Configuration Pin No Pin Name 1 Emitter 2 Base 3 Collector 2N4401 Key Features 2N4401 Specification Name Description Collector-Emitter Voltage (Vce) 40 V Collector-Base Voltage (Vcb) 60 V Emitter-Base Voltage (Veb) 6 V Collector … Read more
2N4401 NPN General Purpose Transistor – Datasheet
The audio level meter is a circuit that detects and measure the level of audio/sound in the surrounding. These sound circuit converts sound energy from the surrounding into electrical energy to light LEDs accordingly. A … Read more
Audio Level Meter Using 2n3904 Transistors – DIY Projects
In this tutorial, we are making a project on an automatic water pump controller (transistor-based). This circuit is a low-cost version of an automatic water pump controller, it is only using some transistors, a relay, … Read more
Automatic Water Pump Controller (Transistor Based)
An LED audio level meter is an electronic testing device that shows the intensity level of any audio signal with respect to its audio amplitude. It has become an essential piece of electronic testing equipment … Read more
LED Audio Level Meter Circuit Using 2N4401 Transistors
A latch circuit is a circuit that locks its output when an input trigger signal is applied and retains that state, even after the input signal is removed. This State will remain for an indefinite time … Read more
Latch Switch Using Transistors
A volume unit (VU) meter is a device displaying a representation of the signal level in audio equipment. They are used in telephone installation and radio broadcast stations. Consumer audio equipment often features VU meters, both for utility purposes (e.g. in recording equipment) … Read more
LED Audio Level VU Meter Using Transistors
A doorbell, here described, is activated as soon as a door knock is heard on the door. It is simple, sensitive, and has a low-cost sensor-based circuit. This doorbell circuit is such that Piezo Electric … Read more
Door Knock Sensing Doorbell using Piezoelectric Sensor
Audio conversion to light LED circuits converts sound energy from the environment to electrical energy. The circuit is a combination of transistors, resistors, capacitors, LEDs, and an electret microphone. Hardware Components The following components are … Read more
Audio Conversion to Light LED Circuit
A very sensitive sound-activated LED circuit activates LEDs by even detecting distant sounds. This circuit here converts sound energy from the environment even with low tune to electrical energy. The circuit includes a combination of … Read more
Sensitive Sound Activated LED with 2n4401 Transistors
Automatic Battery Charger is designed for lead-acid batteries sealed in 12V. The computer built consists of a circuit, which charges the charging unit. The charging package consists of six battery drivers which can be charged … Read more
Automatic Battery Charging Timer
All rechargeable batteries have their own charging and discharging levels, they are likely to experience harm if the voltage of the battery reaches that level. Here is a basic circuit battery voltage monitor used to … Read more
Simple Battery Monitor using 2N4401 Transistors
In this tutorial, we are making a project on the wireless temperature sensor circuit. It is a very interesting and useful project for detecting the temperature of any remote place. You can easily detect the … Read more
Wireless Temperature Sensor with Thermistor
In this tutorial, we are making a project Sensitive moisture sensor. This circuit is versatile and very sensitive, it can be used to detect moisture in substances like floors, walls, soil, etc. Normally, in moisture … Read more
Sensitive Moisture Sensor using 2n4401 Transistors
In this tutorial, we are making an easy and useful project of a temperature sensor LED meter circuit. This circuit senses high and low-temperature levels and gives a visual indication through LEDs. We have used … Read more