Emergency Siren Simulator using 2N4401 and 2N4403
Posted on Feb 6, 2014
Related Circuits
New Circuits
-
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.....
.
This oscillator-driver produces a deafening sound of about 3 kHz, modulated with a 10-Hz warble....
Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit....
This document describes how to read a capacitive humidity sensor directly from a micro controller...
This wireless remote control switch production is relatively simple. All components parameters we...
The audio bandpass filter described is useful for amplification and filtering weak AM TV video...
The easiest solution would be to take a cheap wireless toy car take out its receiver module along...
The Supertex HV7370 is a four-channel, high speed, high voltage, ultrasound transmitter damper,...
I decided to throw together a schematic of how the OEM AUX switch should be wired, and print it...
The circuit that I`ve described is a one-JFET design without much gain. You can significantly...
To get the best from an NBTV signal it is important to use the full dynamic range of the signal...
The 12F629/675 PICs are small 8 pin DIP devices that are ideal for our applications. They include...
The FT-736R is a V/UHF all mode transceiver. A picture of the FT736R can be seen in figure 1....
One Foot Spot Welder circuit The circuit uses IC CD4541 A precise delay characteristics, to...
In this circuit, A = 1, port = o.5, passive vent filter without distinction. When only care when...
Circuit shown in Figure 3-84. Be seen by the two electric motors can be started separately. But...
characters left: