A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the....

This simple alarm timer circuit is made with 4060 which has an integrated oscillator with a good stability with a relatively wide frequency range. In the c...

This tutorial explores a common digital concept using the NI Multisim software environment. It examines a four-bit counter that uses a 555 timer IC to generate the clock signal. This tutorial takes less than 30 minutes to complete and consists of 37 steps to....

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. But it`s easy to add a normally-open trigger.....

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....

This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip....

A timing and counting circuit using integrated circuit chips with seven-segment LED displays is used to display current lap time, the previous lap time, and also the total number of laps completed on an assembled 1/64th-scale slot car racetrack. A switch....

The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1...

When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz. The frequency is Q1 and Q2, which will continue to use push pool work interchangeably. If this is the positive output signal Q1 Q2 will run the delete function this reason, C2....

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The 555 timer IC is a very versatile and useful component and can be used for many things, from giving clock pulses to switch debouncing and as an output transducer. The basic 555 IC is housed in an 8-pin carrier, and these come in DIL and SOIC formats. They....

CMOS Pocketable Timekeeper is pocket size time circuit circuit diagram of CMOS Pocketable Timekeeper and various other timer project advanced timer and electronics project...

guys i need a 2 circuit the one is when power applied the timer will trigger and the relay will remain off when the timer runs out the relay will turn ....

The switch shut off time delay circuit is shown as below. The switch shut off time delay circuit is composed of the timer, optocouplers, bridge SCR, SCR AC switch. When the control button is released, the keeping motor or other AC start power for 1 hour.....

Input voltage from aerial voltage DC DC advocate is 12V AC at 800mA accepted and again adapted to DC through a arch rectifier Diode 1A. The voltage achievement of advocate ambit can be adapted in the ambit of 0-1000V DC. This aerial voltage DC DC advocate....

555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size....

If you need to hold an analog signal for infinite period then this digital sample and hold circuit is the solution. This circuit uses a Exar XR-2240 programmable timer/counter as main component. The Exar XR-2240 is triggered when strobe input is applied. The....

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....

The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is....

The circuit below illustrates generating a single positive pulse which is delayed relative to the trigger input time. The circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled. When the button is....

This is a very practical device and I built it so that it is a module to my Dual Channel IR Remote Control. Because of that I ended up with a definite overkill of what is supposed to be a simple switch with a timer when I open/close my door. Anyway, it is....

classic 555 timer chip schematic circuit t shirt by eevblog picture on VisualizeUs - Bookmark pictures and videos that inspire you. Social bookmarking of pictures and videos. Find your pictures and videos....

This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip....

The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is shorted and output of the astable multivibrator....

Figure 1 is an improved trigger timing circuit composed of 2 PUT. If you add the set signal, the circuit will be set, transistor VT1 turn to the conduction state, the relay K will be energized action. It supplies voltage for the delay voltage at the same....

The cell phone shield circuit uses two NE555 timer ICs: One as being a very simple astable multivibrator (IC2) and then the 2nd as being a monostable multivibrator (IC3). The astable multivibrator has timing resistors R1 and R2 but no timing capacitor since....

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. But it`s easy to add a normally-open trigger.....

This entry is a 4 step sequencer controlling an `Atari Punk` synth with a greyscale NTSC video visualization of the output audio, built using two 558 quad-timers and two 556 dual-timers. Sorry in advance for the poor video quality, I will try to get a direct....

A source code for a very simple PIC based digital timer. The actual hardware of the project isn`t with me anymore. I will rather demonstrate it using my DIY PIC16F628A breadboard module and I/O board. The complete circuit diagram along with the firmware....

This year for Valentine`s Day I decided to get nerdy and make something electronic for Caroline. I first tried to make a animated LED heart with a joule thief  and a single AA battery, but I couldn`t make a suitable air coil. So, I decided to modify this....

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....

This inexpensive circuit can be connected to an air-conditioner/fridge or to any other sophisticated electrical appliance for its protection. Generally, c....