Tone Doorbell circuit
Posted on Sep 19, 2012
file1: Click here to download 2N5219.pdf
file2: Click here to download 2n5226.pdf
file3: Click here to download 1N417.pdf
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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 RF Wave Absorbion meter will detect signals between 10cms and 10m away all acording to the...
More and more serial bus systems are preferred instead of a parallel bus, because of the simpler...
The following circuits is one of the power amplifier circuit for FM transmitter with an output...
The following shows over a 1993 VW Passat electrical schematic. Features: Vehicle content,...
circuit of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief...
Although a hold feature is standard on most new phones, a lot of us still use the origional bell...
This is a project of a ding dong door bell circuit using 555 IC. In the previous article we have...
The diagram shows a set of cell diode capacitor connected in series, each set of increasing...
This electronic organ circuit is very simple to construct and is basically an emitter-coupled...
Use of ordinary telephone ringing circuit KA2401 and peripheral components, the installation of...
Shown for the WS157 or WS106 with low power miniature switching power supply. WS157 or WS106 is...
Circuit works The harvester warehouse full of reminders by the photodetector amplifier circuit...
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