Mobile incoming call indicator

Description. This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated. When a call is coming to the mobile phone, the transmitter...

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Static 0 to 9 display

Description.The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1).The seven segment display...

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UM66T MELODY IC

 The PCB contains just 2 components: 1. 10uF electrolytic capacitor Make sure you insert this component with the positive lead (the long wire) facing right, with the strip on the body facing left. Push it most of the way into the PCB. 2. M66T IC This has...

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TOUCH SWITCHS

TOUCH SWITCH 1 This circuit detects the skin resistance of a finger to deliver a awfully tiny current to the super-alpha try of transistors to show the circuit ON. The output of the "super transistor" activates the BC 557 transistor. The voltage on the highest of the world...

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How to Transform a CD-ROM Drive into a Car CD Player

To be used as CD player, the CD-ROM drive doesn't need to be connected to the computer. This way, it is possible to easily transform a CD-ROM drive into a Car CD player. Sounds crazy? Not so. With this tutorial you will be able to have ...

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Digital Volume Control

This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. Parts: Part ...

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Innovative Drinking Water Production Wind Turbine

The completion of the fifth generation of air condensation water production systems enabled Eole Water to develop a range of products adapted to customer requirements: water production, energy independence, low maintenance, logistical flexibility, no environmental impact. Each part has been carefully designed to ensure that Eole Water’s...

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M8031 ding dong circuit diagram

This electronic circuit diagram is a ding-dong sound effect generator electronic device based on the M8031 circuit designed using CMOS technology. The circuit M8031 has a built-in RC oscillator and digital envelope circuits that make it to require few external components...

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Door bell circuit using NE555

Description.The main part of this doorbell circuit are two NE555 timer ICs. When someone presses switch S1 momentarily ,the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1.When the switch S1 pressed, IC1 is triggered...

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Water Level Alert

This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e.g. a plastic tank) by means of two crocodile clips, acting also as probes. If a deeper...

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Electronic Cricket Match Game

This electronic cricket is a present for Kids. This simple battery powered circuit can be used to play Cricket Match with your friends. Each LED in the circuit indicates various status of the cricket match like Sixer, Run out, Catch etc. The Circuit uses two ICs ,one in...

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Mains Powered White LED Lamp

Did it ever occur to you that an array of white LEDs can be used as a small lamp for the living room? If not, read on. LED lamps are available ready-made, look exactly the same as standard halogen lamps and can be fitted in a standard 230-V light fitting. We opened one, and...

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PC Heat Monitor

The PC processor generates very high temperature during its operation which is dissipated by the large heat sink placed above the processor. If the heat sink assembly is not tight with the processor or the cooling fan is not working, PC enters into the Thermal shutdown mode...

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5 channel radio remote control

TX-2B / RX / 2B  5 channel radio remote control. This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications....

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Water Level Sensor Schematics

This simple water level sensor circuit monitors the presence of water in a certain location or container. The circuit sends an acoustic alarm when it senses a drop of water leak. It is very simple to build and it is made of a single IC and some passive components. Check out...

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USB Player Circuit Diagram

USB series player is an electronic device or electronic circuit that functions as an MP3 player that is stored on a storage device such as USB flash. In this USB circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone,...

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USB Lamp Circuit

Description. Here is a simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the 5 Volt available from the USB port.The 5V from the USB port is passed through current limiting resistor R2 and transistor...

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USB sound card

Description. Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels....

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