Password Based Door Locking
Posted on Nov 6, 2012
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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This device is built around a PIC12F675 (a dandy little part from Microchip). The number of...
The UPS is basically an ac inverter that is powered by a 12-V, lead-acid automobile battery....
This circuit can accept positive or negative or differential control voltages. The output...
The transmitter is built around two CMOS 555 timer ICs (TLC 555s). The transmitter generates a...
The power amplifier IC TDA2006 provides high output current and has very low harmonic and...
I had initially planned to do an LCD tutorial a little further down the line, but there was very...
This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear...
This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C,...
Circuit » Home » 7809 » 7812 » 7909 » 7912 » Dual Voltage » Hobby Electronics » Hobby electronics...
Circuit shown here can be used to jam FM radios in its vicinity. The circuit is nothing but a...
The circuit given here is of a regulated dual power supply that provides +12V and -12V from the...
This simple transmitter operates from a 9V battery as shown above. I personally built this for a...
One of the author`s physics projects required an accurate 1-Hz (seconds) clock signal....
A new generation of intelligent, scriptable sensors/controllers is around the corner. Up to date,...
The circuit below consists of two twin-T oscillators set to a point below oscillation. To set...
This application note describes creating a dumb framebuffer with PAL composite TV output for the...
The EPIC Plus Programmer, Serial Programmer, USB Programmer or U2 USB Programmer may be used for...
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