555 timer audio alarm circuits
Posted on Feb 6, 2014
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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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High Quality simple design No need for a preamplifier Can be directly connected to CD players,...
This amp uses the basic circuitry of the 60W power amp (see Index), but modified for true Class-A...
This evening as I came home from a paragliding appointment, I had a feeling that I must improve...
Major role in the PLL phase detector is held by the duty comparing the input phase of the VCO...
This circuit measures the distance covered during a walk. Hardware is located in a small box...
The circuit described here was designed as an addition to a remotely controlled garage door...
This is Micro inverter or The inverter very small-sized, perform modify from the energy battery...
The red connector is for an optional external antenna wire and the black connector is for a...
The zener provides a constant voltage of 20 V to unijunction transistor Q1, except at the end of...
By the 555 IC Ai, capacitors Cl, Cz and metal plate (tablet) M distributed capacitance Co and...
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