Sobriety Tester with LM3914
Posted on Dec 26, 2012
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 circuit is a small +5V power supply, which is useful when experimenting with digital...
Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] which will be discussed in...
The circuit of a simple triac light dimmer shown below can be used for dimming incandescent...
This documentation was compiled as a result of a bee hive temperature monitoring project....
The circuit consists of channel quad amplifier (LM3900). mic audio inputs and direct line inputs...
Here is a series of Touch Switch using only 3 transistors, this touch-based transistor switches...
Hey everyone. I am building a keypad lock for a project using a PIC and one of those passive...
In 1896, Marconi successfully covered a distance of about 3 km using electromagnetic waves. A...
This circuit can be used for inductive pick-up elements and dynamic microphones Most soundcards...
This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been...
Adopt and put the intermodal servo preamplifier circuit as shown, the circuit is 115V, 60Hz servo...
As we all know, high-voltage isolation switch is not allowed to meet with a load that would...
characters left: