Two-variable-led-matrix-display
Posted on Nov 29, 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.....
.
The circuit uses CA3290 BiMOS dual voltage comparators. Non-inverting inputs of A1 and A2 are...
Using a precision oscillator and a few CMOS counters, you can build a precise, very low...
Above is a schematic diagram of an LM741 light/dark sensor circuit (from the excellent 741 Op-Amp...
This digital DIY tachometer for bikes uses two reed switches to get the speed information of the...
A step-down circuit used to approximately divide by two the rms voltage between the line input...
A N2PK VNA that it would be useful for antenna measurements and wanted to run it with a laptop...
The ambit works abundant like the aboriginal Strobos. except that a beaming tube is used. Thus,...
The wide diversity of automotive motor-drivers, including those used for HVAC (heating,...
I`m making a small DC tesla coil with a rotating spark gap. The motor controlling the RSG draws...
A Float Switch is a device which is typically used to measure the depth/level of liquid in a...
A grasshopper is a switch that is ready to go off at any time. A piece of plastic is placed...
Two transistor oscillator generates pulses at about 500 Hz for step-up by 300-mA filament...
characters left: