555 Timers are very fun to encounter and experiment with. They can be used as a timer and can be set to a certain frequency. In Part II of Electronic Project I, we created a circuit that would get an LED to flash. This time we are going to add a speaker so that we can hear the frequency that is being emitted. · I did not put an estimate next to t
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his one because it can vary depending on the quality and how much you are willing to invest in a speaker. Speakers can be bought or purloined from an old boombox or stereo that you don`t need or want. For a refresher on how to insert chips into board, see Part V. Next, make power and ground connections to the chip as shown to the right. It is typically a good habit to have red wire be exclusively power and black exclusively ground. If problems arise, you can easily pick out where power and ground is traveling. Next, add the potentiometer and LED to the board (as pictured to the left). These are the next important components in this circuit. Make sure to place the potentiometer so that the pins are in different rows; see Part IV for a refresher on how to plug potentiometers into the board. Using a different color than red or black, connect pin 2 to pin 6 (I used yellow wire). The 1 F capacitor was inserted (as can be seen to the left). This capacitor is of ceramic type and so it doesn`t matter which lead is connected to ground or the chip. If you have a polarized capacitor, make sure that the "+" side is toward the chip or that the " " side is toward ground. In the image to the right, I added a grey wire to a resistor and connected the other side of the resistor to the LED. Next I added a wire connecting the "ccw" and "w" pins on the potentiometer (the minuscule wire is circled in orange). I also connected the middle pin of...
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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