Top Circuits Page 124
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A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. I have a PIR sensor connected to an ATMega328p. The PIR sensor has three pins; VCC, GND and....
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As I am using a Common Cathode led-strip instead of a Common Anode one as used in the above link thus I came up with this `modified circuit`. Because my experience with FETs was nihil this didn`t actually work as I would need at least a voltage => Vcc to....
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A series of LEDs I would like to have display at 2 brightness levels and am confused how to properly wire this. This is for additional running lights/brake lights on my bike. When using the series LED calculator I believe for the Source voltage 1 I should....
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Designing a simple current limiter, which charges a large (4. 7mF) capacitor with a charge current of (roughly) 500mA from a supply voltage from about 10-20V - see the below circuit. My dilemma is that I already have a bunch of MMBT2222A and it would be nice....
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The LED is 3V, and according "to the internet" (there was no manufactorer info on it) a blue LED usually supports up to 0. 03A. Since I have spare current from the USB I thought I should build a parallel circuit. Now, the last class on circuits I had was on....
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The circuit works like this: Normally the LED is powered dimly through R1 and R3. SW1 is the spring and wire based accelerometer I mentioned earlier. When SW1 is closed, C2 quickly charges up (at a rate defined by R2) and is discharged through R3 and the....
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Project using Sparkfun`s IOIO for Android ( ) where power consumption is a concern. The IOIO board provides the phone with 500 mA charging if I`m correct, which is too much for continuous operation. There`s a trick I have in mind where I want to power the....
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The circuit generates square and triangle wave. I wonder if I can add a couple of diodes and a potentiometer to be able to skew between triangle-ramp/saw and change the duty cycle of the square wave Is it that simple..
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Experiments with couple of floppy drives I have and it appears that on the step pin, current is limited to around 5 mA. This means that we can indeed omit the collector resistor in this case. For base, I`d recommend a 1 kiloohm resistor. This will give us 3.....
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For a 4-bit Carry Look Ahead Adder have 3 gate delays for all carry bits and 4 gate delays for all sum bits, while it is stated as 7 and 8 in case of ripple adders. How, was this calculated The image of 4 bit carry look ahead adder is shown below:..
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The premise of the circuit is this: I want to power L1 coil with square pulses. You can see I`ve got a freewheeling diode to handle the back emf field collapse to protect the circuitry. From previous experiments and talking to others on here, I learned that....
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I opened remote of a RC car and extended wires out of backward, forward, left and right switches. So when I ground anyone of then the circuit completes andit sends signal to the car. I wanted to close the circuit using one of the I/O pins of BeagleBone....
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Doing a project to use dsPIC as controller to output PWM signal to control motors. I can use driver IC (I used L293D actually) to simply let motors to rotate, but I cannot control the voltage range to control the motor to rotate with all range of speed...
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A working circuit with an opamp but my professor said that they are hard to work with, and gave me some transistors to use instead. enthdegree May 30 `13 at 17:25..
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Assume a capacitor of capacity C is charging to voltage V and discharging to 0v at a rate of 5 times per second. How do I figure out the average current or what you might call RMS current I don`t need this to be exact - very rough approximation. In general,....
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Make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is correct or not [let`s assume we are driving our device in a bright....
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LED will turn on when PIO goes low - acting like GND - and current will be taken from power supply not from PIO like first method. So do I must take care of maximum current of PIO although it just act like GND not like a power supply -like method 1 -. when I....
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A power supply circuit to bring 24VAC down to 5VDC. I have an L7805CV, but rectified (a bridge) and smoothed (a 33 F electrolytic), the input is still $40V_{peak}$, which is more than the max input voltage the regulator can take. Looking at the regulator`s....
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A circuit which basically connects the line out (audio output) of a music playing device to a set of LEDs (actually a huge strip of around 200 LEDs), so they flash in time with the music (from internet tutorials - I`m a bit of beginner). My circuit works....
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You check the voltage at the anode and cathode of the diodes and determine whether or not it is conducting. With a current source I am kind of confused on what to do. I can`t determine the state of the diodes for a given input combination (00, 01,10, 11)....
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What that flip-flop does, but mostly why those two NAND gates aren`t just inverters. and why the one on the bottom (and the inverter next to it) are even there. You should wait with accepting the answer and allow others to have a look and write up their....
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This circuit detects when a tube is empty and pulses a piezo buzzer in. 5 second intervals. I have it working with 5v on a breadboard, but I need to move it to 12v from a wall wart. Secondly, with 12v R1 should be 220 1W, but I want to stick with 1/4W....
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Place the transciever and the chip antenna very close, then there is no need for a 50 ohm transmission line right If so, can I somehow merge those two matching circuits into one and thus reducing component count..
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A circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down. And when the user presses a momentary button, the power is brought back up again. The circuit is normally powered down. When the....
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I have no experience whatsover with building controllers and have no clue on how to start. I don`t want to spend to much money on the project (< 100 ‚¬) thus money is an issue. The good thing is that I already have a power thyristor. My question is how I can....
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Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio set and you can adjust your room size. The circuit described here will make your dream come true, giving a feel that your speaker is located 15 meters behind....
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A simple battery charging circuit is made by a flyback converter current-limited power supply to charge lead-acid batteries. The circuit is made by Maxim-IC company..
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This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated. When a call is coming to the mobile phone, the....
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The 8-pin 555 timer must be one of the most useful ICs ever made and it is used in many projects. With just a few external components it can be used to build many circuits, not all of them involve timing! A popular version is the NE555 and this is suitable....
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This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. An on/off switch is not....
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The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery....
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This website does not collect any personal information unless you contact me by email. If you send me an email your name, email address, and any other personal information you supply will be used only to respond to your message. Your personal information....
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This project can be used for a quiz with up to 4 contestants (or teams). Each contestant has a trigger push-switch and LED. When a trigger switch is pressed it lights the corresponding LED, sounds the bleeper and prevents the other trigger switches from....
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This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the....
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The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set by adjusting the variable resistor.....
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This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light. The time taken for the complete red - red & amber - green - amber sequence can be varied from about 7s to about 2 ½ minutes by adjusting the 1M preset.....
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Here`s a design circuit for very simple antenna amplifier electronic circuit project can be designed using this circuit diagram. This antenna amplifier electronic circuit can be used for a frequency range between 1 and 300MHz. This circuit antenna amplifier....
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This circuit uses the LM358 operational amplifiers (or any single supply op amp) to generate a pulse-width modulated signal. In most cases, I would just use a microcontroller to generate PWM signals. Unfortunately, the circuit was designed for a local marine....
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The amplified signal is fed to the melody generator via resistor R5. The output of the melody generator is fed to LM386 low-power audio amplifier (IC2) via variable resistor VR1, which works as the volume control. The loudspeaker sounds to indicate a voltage....
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The circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the photo transistor (T1). The infrared rays transmitted by IR LED1 is detected by the photo....
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This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this....
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The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and....
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The design includes a buffered virtual ground circuit provided by an LM741, LM318 or similar Op Amp, which sets a fixed voltage half way between the input voltage and ground. This is then used as the virtual ground for the sine and triangle wave outputs from....
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A circuit that lets you operate your home appliances like lights and water pump from your office or any other remote place. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliance with your....
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Most Atmel AVR microcontrollers can be programmed via their in-built serial programming interfaces (SPI). This method is ideal for in-situ programming, such as might be used in manufacturing or for firmware development or field upgrades. In this scenario,....
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If you`ve got a Squeezebox then you`ve probably got an amplifer to go with it. Having to get up and turn the amp on and off when you need it is just far too tedious (especially if your Squeezebox is hidden away in a cupboard or something), so we need a....
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An astable multivibrator, often called a free running multivibrator, is a rectangular wave generating circuit. The circuit doesnt need any triggering. The timing of the circuit is determined by the resistors and the capacitors used in it. The details of the....
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Transistorised Astable Multivibrator is a cross coupled transistor network capable of producing sharp continuous square wave. It is free running oscillator or simply a regenerative switching circuit using positive feedback. Astable Multivibrator switches....
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A new type of remote control based on ultra sonic sound. The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors (....
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A microcontroller (MCU) is a small computer in a single integrated circuit consisting of a CPU is relatively simple combined with support functions such as crystal oscillators, timers, sensors, serial and analog I / O etc. Microcontroller designed for small....
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Before we study the working principles of a TV receiver, it is worth knowing a little about the journey of the object image that we usually see on TV. Images that we see is the production of a camera. The object image captured camera lens will be separated....
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At times it`s really very annoying to see the street lights kept switched ON even during broad day light. The present circuit of an automatic night light can very effectively put an end to this problem. Read here how to build it. We all know how important it....
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This article is in continuation to the articleSingle character LCD display using AVR. The aforesaid article shows how to display a single letter onLCD. Moving forward towards learning to work with LCD, this article explains how to display a string on LCD.....
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2 Tone Door Bell here published is verified project produce ding-dong sound circuit diagram of 2-tone door bell with description.various door bell and alarm project ...
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70/40 Watts Hi-Fi amplifier is most advanced, and best Hi-Fi amplifier having almost 0% distortion circuit diagram and description of hi-fi amplifier.hi-fi amplifier...
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Device such as burglar alarms and sirens, whose basic purpose is to monitor tested circuit diagram with description of burglar alarm alarm using dual operational amplifier...
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this verified project provide idea, circuit and working of the system LED display temperature indicator. Digital temperature indicator.using V/F converter.various electronics project...
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This project introduces important type of transducer, an optical coupler. An optical coupler together with a square wave generator and counters can be used to construct a timer for appliances. That is, an appliance can be turned on at a desired time for a....
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This is a simple audio amplifier circuit fabricated around BEL1895 1W audio amplifier IC. This circuit is alternative of the complicated audio amplifier circuit for portable radio receiver. No driver circuit for loudspeaker is needed with the facilities of....
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Automatic Dipper for Vehicles using timer IC NE555 and LDR use to dip the light of vehicles circuit diagram with description various automobile project...
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Automatic Temperature Controlled Fan control the speed of fan according to change in temperature using temperature transducer AD590 and op-amp LM324 circuit diagram...
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Bass booster of this website is used to boosts the beat frequency without effect the high frequency circuit diagram of bass booster bass booster and different radio circuit...
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Battery Voltage monitor is used to indicate the voltage level of 12 volt battery circuit of battery voltage monitor verified electronics project circuit with description...
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Basically this circuit is similar to some flasher circuits already published in using IC555 as a free running multivibrator. The only difference lies in the way it flash using bi-colour LEDs. When output at pin 3 of IC 555 goes high it operates on group of....
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Car Reverse Horn can be used in car as reverse horn circuit diagram using melody generator IC CTC2877 and amplifier IC AN7148.various automobile project with description...
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Clap operated Remote Control for Fans in this website is used control ten-step speed of fan circuit diagram and description of Clap operated Remote Control for Fans...
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CMOS Pocketable Timekeeper is pocket size time circuit circuit diagram of CMOS Pocketable Timekeeper and various other timer project advanced timer and electronics project...
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Co-axial cable tester is used to test whether the co-axial cable is open or short circuit or good using digital IC 4001 circuit description with parts list and various project...
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Here is a project Device switching using password by innovative group Dreamlover technology, lets the user to lock their device with password. The block diagram of device switching using password is shown in figure 1. As the circuit device switching using....
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Various techniques can be used to control the speed of a dc motor, such as using the phase-locked-loop principles, digital inputs, or analog inputs. If desired, the speed of the motor may also be monitored with LED or LCD displays. The project digital DC....
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Digital Mains Failure / Resumption Alarm use optocoupler and produce sound.circuit diagram with description of digital mains failure various alarm cirucit...