Electronic phone bell
Posted on Sep 15, 2012
New Circuits
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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 circuit will activate a relay when light falls to a preset level. Light level can be...
The ProfiLab-Expert software allows you to develop your own digital or analogue measuring...
In this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output...
It is important to know that transistors Q1,Q2,Q3 must not work like an astable (tri-phase)...
Mains frequency is pretty stable and it is unlikely that you have to measure it but if you have...
This temperature controller has a range of -50 to +150°C and permits defrosting. R7, VR3, and R8
An interesting DC/DC converter IC is available from Linear Technology. The LT1615 step-up...
Developing a battery switch-over circuit which is made of two lanes of the depicted circuit....
An R/C electric motor that has a 10K thermistor sensor built into it, which is connected to a...
This plugin uses a quartz oscillator which uses a crystal (X1), amongst other components to give...
The post explains a simple delay ON circuit which allows the connected load at the output to be...
The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver...
When the system is placed in a shop or mall, logos and product advertisements are a perfect...
The Clock Controller was designed to be an exemplary of using `C` language to control timer0...
As shown for the high-speed integrating circuit. The integration time constant circuit RtCt have...
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