Electronic Siren
Posted on Jun 9, 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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The tool is based on a NE555 (or LM555) timer i.c., wired as an astable multivibrator. The...
This circuit operates as an oscillator and a timer. The 2N6028 is normally on due to excess...
If the output is low, application of a negative-going pulse to the trigger input sets the...
The moisture detector uses two transistors and a piezoelectric transducer to sound an alarm tone...
Many of us have a pair of headphones connected to the output of the computer sound card us either...
By simple, I mean that these circuits only flash one or two LEDs. This is opposed to the light...
A simple multi-channel audio mixer circuit using LM3900 quad amplifier is given below. The...
This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery...
Here is a simple technique for measuring frequencies over quite a wide frequency range and with...
When the potentiometer is at the up position, the capacitor will charge quickly through both 1k...
By the ultrasonic sensor, control and display (or buzzer) and local composition, it can tell the...
This kit is a daughter board, designed by Jan G0BBL and Tony KB9YIG, that provides four...
When one of the switches is closed - the base of Q1 is connected to ground through D1 & R2. This...
I built two secondary coils: Small coil D25.4/H119 (Diameter=25.4mm and Height=119mm) and Medium...
Rechargeable ago memory circuit Before the memory circuit is considered instantaneous action, the...
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