simple and cheap dark detecting led
Posted on Feb 5, 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.....
.
Safety devices like fuses provide protection against excess current, but do nothing for...
For the outband decoder shown here to work, the cable company must provide at least a 1 millivolt...
A simple means of generating a low-power voltage supply of opposite polarity from the main...
Display interface uses the ICM7218A/B with an 8048 family microcontroller. The 8-bit data bus...
This astable will trigger itself and run free as a multivibrator. The external capacitor charges...
This circuit switches its dc/dc converter, IC1, off whenever the large filter capacitor, C6, has...
This active splitter for laptop audio-out is powered from a USB and provides individual channel...
The heatsink on the triac is a bit unclear for me. I`ve calculated a maximum value of 10C/W, is...
For the most part we live in an analog world and when using a microcontroller, it is often...
A band-pass filter is a circuit which is designed to pass signals only in a certain band of...
This house FM transmitter for your stereo or any other amplifier provides a good signal strength...
A touch switch for a USB powered desk lamp, and the touch switch isn`t working. The circuit...
12dB/oct Butterworth second port (most flat characteristic) of the filter circuit value is...
As shown in FIG photoelectron pulse missing detection circuit. The detector consists of...
characters left: