Without the specified delay the circuit could malfunction or even get damaged. A capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see thatit`s been placed at the other end of the base resistor and not....

This circuit displaying  the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to ....

Enter values for R1, R2, and C and press the calculate button to solve for positive time interval (T1) and negative time interval (T2). For example, a 10K resistor (R1) and 100K (R2) and 0. 1 uF capacitor will produce output time intervals of 7. 62 mS....

A timer circuit using IC 4060 is given here. The IC 4060 is a 14 stage binary counter with a built-in oscillator. R2, R7, C1 are the components that determine the frequency of the oscillator and the outputs will become high one after other and only one at a....

This is a schematic of a IR transmitter circuit using IC. The IC used in this circuit is a famous timer IC NE555 which is working as an astable multivibrator in this circuit and producing a 38KHz frequency signal. The circuit starts to produce the signal....

Play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along with a 7-segment display. The game is simple. As stated above, it is a scoring game and the competitor who scores 100 points rapidly....

This infrared repeater system is used to extend the range of an infrared transmitter used at an audio or video equipment at 10 m. The original signal is ca...

This metal detector electronic project schematic circuit is designed using a simple 555 timer integrated circuit. As you can see in the schematic circuit, this metal detector electronic project requires few external electronic parts...

This document is written in attempt to include everyone interested in serious construction of a quality product. Its very technical, however, written openly and honestly. It`s designed for Amateur Radio (not commercial) at no cost to obtain and is open for....

Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a 555 timer IC which is utilized as an astable multivibrator of a center frequency of about 300Hz. The frequency is controlled by the pin 5....

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This timer circuit can be used to switch OFF a particular device after around 35 minutes. The circuit can be used to switch OFF devices like radio, TV, fan, pump etc after a preset time of 35 minutes. Such a circuit can surely save a lot of power. The....

The 555 adjustable timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the....

A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. The most common form is the astable or oscillating type, which generates a square wave - the high level of harmonics....

This circuit takes the outputs from two different 555 multivibrators and combines them using a summing Op Amp. Shown only to depict another implementation of a 555 timer, most of the back ground calculations being covered under the other topics in this....

When the switch S1 / 2 power input to the circuit C1 No. ua741. To a voltage comparison circuit. The pin 3 is the noninverting pin. for pin 2 to pin inverting. The pin 3 was divided voltage from R3 and R4. Used as a reference voltage for comparing the....

This circuit drives a motor clockwise / anticlockwise via a pot and reduces the speed to zero when the pot is in mid-position. The current is limited to 200mA and the voltage across the motor is less than 6v, but the circuit shows the principle of Pulse....

This PIC16F877 microcontroller tutorial answers the question, "" How to use timer0 of PIC16F877 and how to handle its interrupts? "" Using PIC16 simulator (P....

This mini metronome gives a linear scaled output and 40 to 208 beats per minute. 1- Q1 and Q2 transistors provide linear frequency variation of IC1 depend....

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The LTC ®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox ® family of versatile silicon timing....

As its name indicates it has one stable state and it switches to unstable state for a predetermined time period T when it istriggered. The time period T is determined by the RC time constant in the circuit. Monostable mode of 555 Timer is commonly used for....

The goal is to repeat the demonstrations showing that the electrical field energy developed by a well-designed Tesla coil transmitter can be detected by a sensitive, well-tuned Tesla coil receiver placed at a distance exceeding a few wavelengths. The present....

Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he will really appreciate. And it will be really special as you will be giving something made by you - a set....

This circuit using a dual-timer NE556 can produce 1Hz pulses spaced 5 seconds apart, either manually or automatically. IC NE556 comprises two independent....

This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact....

This project aims to build an IR interval timer which can be used to capture images such as time lapse movies of sunrise or sunrise and the night sky. The....

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....

At certain times of the year I migrate a bit North of Southampton to an area where the the hams on VHF are grumbly and seem to be few and far between. Add to this that the local repeater only uses tone burst and that the QTH is right next to some noisy....

The second 555 timer was configured as a monostable circuit, commonly referred to as a one shot since an output pulse only occurs if there is a trigger on the input. When this timer is triggered, the potentiometer in the RC timing network allows the output....

This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine....

A circuit that can turn off head lights/lamps of a car/vehicle automatically after a preset time.This light switching circuit is built using 555 timer IC...