Repository-circuits
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The Maya used several calendars simultaneously. One of them called the "long count", is a continuous record of days from a zero date that correlates to Aug. 13, 3114 BC, and is more According to maya`s celender when the both the wheel of the maya celender.... -
The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via.... -
Traditionally, high quality reception of VLF natural radio signals has involved driving or hiking out to remote locations far from civilisation, in order to find an environment free of pollution by artificial radio signals. I`ve lost count of the times I`ve.... -
With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room. Here a counter IC 7490 is used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and.... -
I am again here with another basic electronics projects, this time we are here to make our own regulated power supply We need a regulated supply so many times while working with electronic circuit, so we must have knowledge about regulated power supply, so.... -
This H-bridge i`m using now for my Sumo-bot ( This H-bridge )I think is fairly good for medium size motors ( untill 30A peak and 13 A continuous mode). The price is arround $75 plus sending. We start talking about what is a "H-bridge". One H-bridge is a.... -
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One.... -
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc. But if you need simple and chep for RS 232 converter, i though this circuit will be usefull for.... -
The Arduino system offers an easy and open-source method for programming microcontrollers. Normally this means using a serial cable or USB cable attached directly to the microcontroller project. But what if your project is floating in a weather balloon,.... -
Here`s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings.... -
i`ve been wrapped up in Jeep repair lately as there`s some sort of issue prevent the beloved XJ from firing up. i have, however, in the meantime had some time to work through my initial modulation tests on this version of the PT2399 circuit and nail down a.... -
The first two are `passive` elements and op-amp is an `active` element. Also: the first two are `two-terminal` elements and the op-amp is a `three-terminal` element. Resistor has the ability to define the current that flows through it when a voltage is.... -
This project is an extension of two projects - first is the work on adding an APF-type high-Q bandpass feature to the 2nd RX of the FT-2000. More on that project may be found by CLICKING HERE. And the second driver is the memory of the fun I had as a kid.... -
These netbooks use ALC5632 audio codec plus mixer IC which has quite some amount of knobs and switches. Most of them are available for direct manipulation with alsamixer, GNOME Volume Control and other applications that interact with ALSA mixers. Here ALSA.... -
In order to manufacture large quantities of anything, there needs to be a manufacturing system or process in place. The manufacturing process can be open loop or closed-loop. In an open-loop system, variables are controlled manually. In a closed-loop system,.... -
My final project, cycling rollers, requires a method of sensing the rotational speed of one of the rollers. Typically speed sensors on cycles work by detecting the passing of a magnet attached to a spoke on one of the wheels using a Hall Effect sensor or a.... -
Nowadays using programming pods are commonly accepted and widely used in manufacturing, especially when a new product is introduced and the firmware is in the early development stages. After the completion of all visual and structure tests, the board is.... -
Magic Sinewave Analysis using SPICE and a Simple Inverter Circuit... -
Special tabbed-resistor geometries (improving time stability), full input protection from damage due to static discharge by diode clamps to V+ and ground, large IOUT1 and IOUT2 bus lines (improving superposition errors) are some of the features offered by.... -
Communication systems using spread spectrum techniques, compare to narrow-band systems are more resistant for noises, signal fading, Doppler effect. Because of code division of signals (CDMA) we can more effective use frequency band and we can increase.... -
Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of PN sequences given to each branch (to input of double-balanced mixer). In EARLY branch, phase of PN sequence is earlier about ½ byte. In LATE branch, phase of.... -
A new type of NiMH battery known as HeCell has recently been developed, which is claimed to allow higher discharge rates than the conventional ones (about 12 - 16C). .. -
This afternoon I have returned to 10m WSPR. There are lots of transatlantic reports of my signal, as well as reports of my 2W signal from Russia and Brazil. Sackville Gardens springing into bloom - Sackville Gardens is one of too few oases in Manchester city.... -
This blog shows project documentations of various projects done by members of association of experimental electronics. Some projects are very easy and suitable for beginners, some are only for more advanced solderers. The core parts of this sequencer were.... -
The 7490 counter is a negative edge triggered decade counter that counts from 0 to 9. Pins CLKB & QA must be connected for this counter in order that it would operate in the decade mode. The inputs R0(1, 2) & R9(1, 2) are asynchronous reset pins, one of each....
New Circuits
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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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