This circuit based project demonstrates the working of 555 timer in astable mode to generate pulses of time period 0. 5 second. This pulse can be further used for anything where we need a pulse such as to blink a LED or to create fashionable blinking lights.....

The voltage rating on the 470 µF capacitor is not critical, so long as it generously exceeds the maximum power supply voltage. In this particular circuit, that maximum voltage is 12 volts. Be sure you connect this capacitor in the circuit properly,....

Function: made for battery charging time of three hours. Once the charging time is up the battery will be disconnected from the charger. Component: 4017 IC, ....

When you press a start button, the arduino picks a random 4 diget code and flashes lights to show the code. When you repeat the code in the other buttons, the XBee will send a message to the other XBee, which will ring the bell. int bell=5; void setup(){....

This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example, we commonly see use of infrared proximity sensors on public drinking fountains and in public washrooms. The....

You can cut away the 555 timer oscillator part and add your favorite microphone modulating circuit to transmit voice over to your tv set with a little tuning. Schematics in Schematics Depot were found on the internet and assumed to be in public domain.....

Turns-off your amplifier when idle for 15 minutes, Fed by amplifier tape-output This circuit turns-off an amplifier or any other device when a low level a....

Quartz crystals have the property that their amplitude/phase characteristic repeats itself at frequencies that are an uneven multiple of the fundamental frequency. There are so-called overtone crystals that are cut in such a manner that they possess this....

The following circuit shows about BC547 Transistor For Output Relay Delay Audio Amplifier Circuit Diagram. Features: disconnects the speaker immdiatly when the ....

This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to be powered from a computer`s USB port. The 555 timer....

The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....

Tools that created this is to produce noisy atmosphere. This circuit is quite simple, this circuit controlled by two 555 timer IC is assisted by other discrete component resistors and capacitors. The first 555 timer U2 will generate a tone which can be heard....

In a basic astable timer, configuration timing periods 11 and 12 are not controlled independently. The lack of control makes it difficult to maintain a constant period, T, if either 11 or 12 is varied. In this circuit, charge RAB and discharge R8 c....

A simple seven/7 segment counter circuit with an LED display. This counter circuit diagram is designed using IC CD 4033 as counter,555 Timer IC and seven segment LED Display LT 543....

The objective is to make a small light that is activated by motion and will remain on for 20 seconds and then deactivate. i. e. you pick up the light it illuminates youput it back down and it remains on for 20 seconds then turns itself off. until it is....

I`m trying to get an ignition coil to create sparks running it with a Mosfet powered by a 555 timer. The Mosfet is definitely switching. I checked it....

This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....

A simple and cheap automatic night light circuit desingned based on timer IC NE555 that extinguishes after a preset time. This time can be adjusted too....

This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-closed input devices - such as magnetic-reed contacts - foil tape - PIRs etc. I`ve used a 12-volt supply in the drawing -....

The first section of the 555 timer is wires as an astable oscillator with R2 and C1 setting the frequency. The output is available at pin 5. The second section is wired as a phase inverter. That output is available at pin 9. Resistor R3 and R4 keep output....

Whenever I use the 555 timer, it seems that the output polarity is invariably incorrect, and the way the 555 functions, it normally cannot generate a duty cycle of less than 50% ” 90% yes, 10% NO! This inverted 555 circuit generates duty cycles of less than....

In most of the industrial processes it is required to rotate DC (or AC) motor forward and reverse for desired time. First motor rotates forward (clockwise) for some time (say 2 3 min) then it stops for some time. Again it rotates reverse (anticlockwise) for....

This clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. It can be programmed to time from 1 to 59 minutes. The clock includes a calendar with leap year and optional daylight savings adjustments. The....

A development board for practicing 8051 microcontrollers. The development board is simple one containing minimum hardware required for a 8051 chip to function. The 8051 chip used in this development board is 89S52. The AT89S52 comes in a 40 pin PDIP package.....

The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules please refer to their respective datasheets. The receiver consists of a 555 timer IC....

This schematic is version of a simple LED chaser. There is no 555 timer used because at my local electronics store they are over $4 Cdn. Instead, an oscillator made up of two sections of a 4011 NAND gate is employed. This chip is very inexpensive and....

This circuit uses a 555 timer which is setup to both runn in an Astable operating mode. This generates a continuous output via Pin 3 in the form of a square wave. When the timer`s output changes to a high state this triggers the a cycle on the 4017 4017....

A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....

555 timer circuits LM555 - Astable Oscillator Calculator + Capacitor Calculator, Basic Circuits For The LM555 Timer, Triggering And Timing Helpers For Monostable Timers, Controlling Circuits For LM555 Timers, Advanced Circuits For The LM555 Timer, LM556....

The following circuit shows about 5 Zone Anti Theft Circuit Diagram. This circuit Based On The CMOS 4050B IC. Features: system may comprise in ....

This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1. 5V batteries. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications. In figure 1 the LED will be ON for a short....

The basic idea is to turn the motor just a little bit every 15 seconds or so. A monofilament line transmits the motion to the ornament. It gets wound by the motor and slowly unwinds by turning the ornament. The charging path has a 1 megohm resistor in it,....