Electronic combination lock
Posted on Oct 31, 2012
New Circuits
-
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.....
.
"Should I cut the blue wire... or the red...?" This is a very common phrase in many movies when...
The experimenter's pot is a solid state potentiometer using Dallas semiconductor?s DS1869 and...
A simple FM wireless microphone uses a single BC183C transistor as an audio amplifier. A 2N3565...
This antenna might help to reduce power-line noise. A plastic hula hoop or conduit 3 feet in...
The time constant of R1C1 determines the low-cutoff frequency while the time constant of R2C2...
The history of a pioneering tube that was developed by Philips Research and that was, next to the...
This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is...
Basic Regen design is pretty common, so BEFORE the schematic comes the "concept stage", the...
These two circuits are multi-range timers offering periods of up to 24 hours and beyond. They can...
Circuit as shown by 555 and the light emitting tube. 555 and R1, R2, C1 composition astable...
Circuit diagram all three parts of the series resonant crystal and triple CD4049 inverter...
FIG load test is a control circuit. This external load circuit up to 10A, widely used in the...
characters left: