AVRtools has an intuitive graphical user interface, and is based on the use of predefined function blocks. It offers a large range of basic functions: timers, counters, logic, analog signal processing, etc . Included are function blocks for sending SMS....

Here`s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I would recommend you to make the following projects. The 555 timer with R1=68K(say timer1) is configured in slow astable mode and the....

The linear charging ramp is most useful where linear control of voltage is required.Some possible applications are a long period voltage controlled timer, a voltage to pulse width converter, or a linear pulse width modulator. Q1 is the current source....

A very simple music instrument/keyboard for playing music using a 555 timer chip circuit, a piece of paper and a pencil. To see it in action watch the how-to-make video below. And then I made the much fancier automatic music player in the photo below by....

Making a timer that is used for circuit training or boxing training etc. Here is the cycle I am looking for. This does not need any input, but to reset the timer to the beginning. its a simple project why not making it simpler by using a microcontroller you....

This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off automatically after some time, saving battery costs. R1 and C1....

This following circuit shows a voltage doubler using NE555 timer. This is a simple project. The NE555 IC is wired as an astable mutivibrator ....

A 100 second delayed turn ON relay RL1 switch, if plug power +12V in circuit. In Fig. 2 see a two range 6-60 second and 1-10 minute auto turn off relay timer circuit, with 555...

It functions like almost any 555 astable timer, except that the LED is inserted into the capacitor reset path so that when pin 7 discharges C1 to common, this relatively high current must pass through the LED. In this way, the average battery current is only....

You can use this water level alarm circuit anywhere as a water level indicator to detect the desired level of water for example in tanks, swimming pools or at any place where you store water. The circuit is build around a 555 timer IC which is a famous and....

This Timer can give a time delay from 10 minutes to 12 hours. The time delay can be selected using a Rotary switch and when the timing cycle completes, relay energizes and remains latched till the circuit resets. This circuit finds various applications like....

The 555 timer produces a rapid series of pulses whenever switch SI is open. These pulses are counted in groups of 16 and converted into binary form by the 7493 and applied to the 74154 (a l-of-16 decoder/demultiplexer) wired so that each of its 16 output....

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....

Universal Timer is a most versatile timer project wide range of 1/10th second to 100s hour time period circuit diagram with description of universal timer various timer circuit ...

A small circuit that can find a lot applications of measurement time. She has the possibility us inform with sound signal from the BZ1. At the same time, exist the possibility drive a external circuit via the optocoupler IC2, after we connect the applicable....

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Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....

Resign a complex solution using few external components, resulting an low cost application that provide a high precision measurement. This Digital thermometer microcontroller project use watchdog timer function to measure temperature. The WDT on all....

The lf555afosc1. pdf file download is the diagram (with notations) of Sub-Tone (CTCSS or "PL") Oscillator, made with the famous 555 timer IC set up for astable-multivibrator operation. The values shown place the tone range near the center of the standard....

This article was previously published at, but I`d like to spread the idea further, possibly sparking new ideas in some of you, so I`m releasing it here too. My old partner and I were working on an improved version, using an ULN2803A instead of the many....

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This 555 timer clap switch circuit electronic project is designed using some common electronic parts. This 555 timer clap switch circuit electronic projec....

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This circuit provides a visual 9 second delay using 10 LEDs before closing a 12 volt relay. When the reset switch is closed, the 4017 decade counter will be reset to the 0 count which illuminates the LED driven from pin 3. The 555 timer output at pin 3 will....

LAN tester circuit diagram provided in two designs. The first design use timer IC 555 and decade counter 4017. The second design use microcontroller ATtiny2313..

In this circuit the intensity of LED will vary in a ramping fashion. The circuit consists of three ICs: Two 555 timer ICs and one LM393 op-amp. IC1 and IC2 are wired as oscillators to produce 10 KHz and 1 Hz frequencies respectively. These two frequencies....

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This LED Flasher circuit is based on the 555 timer IC. The LED Flasher circuit diagram is very simple and require few external components. When the circuit is working the red LEDs will flash at a set frequency one by one like at the railway crossing....

PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjustable analogue voltage level (in the case of a NE555 based PWM generator) or digitally using binary....

Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....

This circuit "cheats" by using only two J-K flip-flops to make a three-bit binary counter. Ordinarily, three flip-flops would be used - one for each binary bit - but in this case we can use the clock pulse (555 timer output) as a bit of its own. When you....