Repository-circuits
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First off I should mention that this is supplemental Instructable to the countless others that show you how to build a USB charger. I am assuming you.... -
You will need this project when you have an extra mobile battery or you need to charge any lithium, Lithium ion or Lithium Polymer battery. Maximum c.... -
Assemble the circuit on a perfboard or pcb except the inductor. Attach two long wires at the place of the inductor. Use a long rod and place the induc.... -
This is how to make a trimet. The parts you need are: 3 Capacitors, a 2N3904, a 2N3906, a resistor(1k to 10k ohm), a solar cell (minimum 3 volts),.... -
Hello all, Recently I acquired some samples of IR LED`s, and a matching IR Phototransistor. I was bored, and decided to make something with it!.... -
If your are like me which I am guessing you are, then ever since you got into doing stuff with arduino you have wanted to make your own arduino board.... -
The PICAXE basic code is easy: the main loop keeps looking for a signal from the IR receiver via the irin command. When it gets a code, it places in.... -
This Instructable describes the installation of a SPY5000 two way motorcycle alarm with a Honda 1998 CB250 Nighthawk motorcycle. This Alarm is rat.... -
Tired of always being snuck up upon? Doing any stealth surveillance or reconnaissance? Or maybe you just need to set-up a fail-safe alarm for your stu.... -
Hi guys..!!this is my 1st easy cheap n simple instructabel u need following components for laser burglar alarm-1. LDR or photocell 2.printed circui.... -
Here`s the new flasher circuit schematic. It consists of a 555 timer circuit and a power transistor. The power transistor is probably way overkill, (it is rated at 10A) but it`s what I had available. You can vary C1, R1 and R2 for to vary the flash rate and.... -
Hello everyone, thank you for checking out my first Instructable. I have enjoyed seeing your creations over the years and love what all of you are con.... -
Attached the circuit schematics 12 Volts : from car battery Ground : Car chassis Signal : from the sensor stepper motor The No 5 Pin of LM3914 c.... -
Learn how to fortify your fortress no matter what the size with this ingenious myriad of a customizable laser grid. Once someone steps through and bre.... -
This instructable will teach you how to make a laser trip mine. If someone steps in the lasers path I have gotten it to set off a L.E.D., but you can.... -
I assume anyone who wants to make this can read the schematics bellow Basic principles:NOTE:Li-Ion batteries shouldn`t be discharged bellow 3V (In.... -
Here`s a handy Arduino shield: we`ve had a lot of people looking for a dedicated and well-designed data logging shield. We worked hard to engineer an inexpensive but well-rounded design. Not only is it easy to assemble and customize, it also comes with great.... -
The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following web link: Don`s Projects.... -
Hi and welcome to my first instructable! I`m going to show you how to make your own low-power wireless charging circuits that will let you pass elect.... -
It is very important to know about the pins of the IC in order to build the circuit. 1GND - Ground, low level (0 V) 2 TRIG -. One day i went to my friends house and noticed that his doorbell gave a sound similar to a cuckkoo bird, whereas mine was a simple.... -
Now Look carefully following circuit Diagram & try out the circuit on bread board first. if it is working properly go to making its PCB version. the P.... -
As MIDI data is transmitted between instruments using a current loop, a opto-isolator (6N139) is used to convert this current loop into TTL pulses. Th.... -
Audiostrobe glasses are used in conjunction with light and sound machines, as well as some brainwave entrainment software. The glasses have LEDs buil.... -
This is the circuit diagram. It is essentially a DC-DC converter, and a PIC 16F84 (or PIC 16F88) to drive it. Sw1 is a test switch - push it to caus.... -
Make sure to double-check your connections using the circuit diagram and schematic below. You can use this while you follow along in the tutorial vide.... -
My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres.... -
The reflected IR signal detected by the photo diode is fed to a signal conditioning circuit that filters the unwanted signals and boost the desired pu.... -
The circuit is a basic 555 timer circuit in astable mode. In this configuration the IC sends a brief pulse to the buzzer every few minutes. The values....
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.....
Popular Circuits
The machine model, commonly used for ESD testing in Japan, is a more severe ESD test. This model...
Its a digial clock which make use of AT89C4051 to work as a Real time clock. Port 1 of the...
To avoid excess ripple output on a power supply feeding a heavy load, usually a large value...
This project is intended for controlling mains powered disco lighting, although there are many...
This figure shows a one-of-two switch with a sunnning amplifier. The video source"s line can be...
A 555 timer drives Ql through Q4 with a square wave. LED1 and LED2 light when an npn or pnp...
This project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to...
If a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching...
The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin...
This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang...
This circuit uses low-voltage AC to drive a string of 50 or so bi-color LEDs (two LEDs connected...
An audio power amplifier can boost weak signals from a tuner, CD player, or tape deck to fill a...