Tell-A-Bell
Posted on Sep 7, 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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Just a handful of components builds an 8-pin microcontroller based circuit for temperature...
The device serves to quickly establish the status of an indicative power cells. I built it for...
The operation of the circuit is like an enabled inverter, that is, the output Y = B provided A is...
The expander to complement the compressor is shown. An external op amp is used for high slew...
IC1 contains several oscillators and an amplifier. The low-frequency audio-signal oscillator is...
So, after yesterday`s post about The Demon Machine I decided it would be fun to play around with...
This infrared alarm barrier can be used to detect persons passing through doorways, corridors and...
The circuit on this page is for a visible and infrared light detector circuitboard that has 8...
A very simple battery charger circuit is described in this article, which uses just a single...
The SM5023 series are 3rd overtone crystal Oscillator module ICs. They feature built-in...
This is a very good integrated circuit. There is no need for any external glue logic to drive the...
An innovative current detection method, eliminating the power loss of the sense resistor in...
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