Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer....

This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic....

Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...

This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....

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The following circuit is the combination of echo chamber circuit that will make the sound repeated, just like an echo sound when you speak in cave. And the robot voice effect circuit that change the audio signal from input to become sound like a robot voice.....

This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334....

the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....

This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At switch-on, the circuit lights the red signal for 30s, then shows green for 6s, then amber for 3s. It....

This is a 555 tone generator circuit based on NE555 timer IC. NE555 is a very famous IC used in many circuits and performs variety of tasks. In this circuit the IC is used as an astable oscillator and the circuit will generte a tone when power is applied.....

The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....

This circuit enables the on/off times of a 555 timer to be independently varied over a wide range. This is not possible with a conventional 555 circuit wi....

The following circuit shows about Cat And Dog Repellent Timer Circuit Diagram. Features: used to maintain a deep cycle battery from a solar panel, ....

The optimum duty cycle and frequency for the strobe photoperiod needs to be determined. In other words we`re flying blind in regard to optimum frequency and duty cycle. The circuit I designed is 3Hz with a 50% duty cycle. I chose this frequency based upon....

This circuit was developed since a number of visitors of this website requested a timer capable of emitting a beep after one, two, three minutes and so on, for jogging purposes. As shown in the Circuit diagram, SW1 is a 1 pole 9 ways Rotary Switch. Setting....

This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....

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flasher with beeper in this site is very easy to build and assemble. flasher with beeper is build with very common components. various project using NE555 timer IC...

555 Timer TV Remote Controlled Home Appliance Circuit Diagram. Features: 555 timer IC to avoid fast switching. you can only switch the circuit ....

This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuosly. The individual events within the sequence - can be made to repeat....

The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time....

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I am presenting you a simple smoke sensing alarm circuit using 555 timer. By using this circuit you can detect smoke and it alarms when the air is contaminated. Let me introduce you the components used in it. This smoke detecting alarm is based directly on....

555 Timers are very fun to encounter and experiment with. They can be used as a timer and can be set to a certain frequency. In Part II of Electronic Project I, we created a circuit that would get an LED to flash. This time we are going to add a speaker so....

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This is a very simple 555 timer circuit,It make a simple theft detterant which may be just as effective. The idea is to have a flashing red led indicate that your car is protected. This device can protect your vehicle from potential thieves....

The following circuit shows about  servo motor driver. This circuit based on the 12F675 IC. Features: Timer 0 timing, single control line from ....

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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.....

The circuit described here was designed as an addition to a remotely controlled garage door opener. The problem was that a brief burst of interference, arising from a thunderstorm or a mains spike, was enough to trigger the mechanism, and the author found....

An electronic dice is a classic first project for those getting interested in electronics. A timer, counter and a few LEDs makes a circuit that can also add a new twist to some old boring board games. When the switch is pressed, a 555 timer in astable mode....

In this electronic roulette wheel (see Fig. 1. ) the timer 555 works as a generator of pulses with fading frequency. The counter 4017 switches LED`s one by one in the selected string, and the divider by two based on D-type flip flop (4013 IC) selects the....