This is the Sequencer circuit. Power to the Logic portion of the circuit is provided by a standard commercial "wall-wart" power adaptor supplying 6 VDC. The 555 timer IC provides the pulse train that drives the chase; the timing is adjustable with the 100K....

This 9-minute timer switch can be used to control the light in a toilet or bathroom. The timer is started by pushing S1 and stopped by pushing S1 again. If you forget to turn it off, the controlled light will go off after nine minutes. If you need the light....

I am going to present you fabulous Electronic project, DEVICE CONTROL USING TIMER. By using this circuit you can turn ON an appliance at a desired time for a specific time interval. You can use this concept to control the operation of a furnace or central....

This is a design for the tracking transmitter of audio tone in FM band frequency. The circuit can be used a signal transmitter or remote control transmitter. The circuit is use only the available components. The range of the transmitter is 100 m in the....

Simple variable frequency oscillator. This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer. With values given...

This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this....

In principle, the square wave oscillator doesn`t have to be a 555 timer, it could be a ring oscillator using inverters as you propose. In practice, using 4000 series CMOS logic for example, the negative output voltage produced would not be able to provide a....

If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. We`ve kept simplicity in mind and used a dual 555 timer, making the circuit a piece of cake. We have even designed a small PCB for this, so building....

This is a design circuit for soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. The timer is triggered on the zero crossing voltage pulse. The time constant determined by C5/R14+R15 that is used to determine the....

I recently uncovered this schematic, that seems to be authentic and does not feature the 555 timer. Additionally if you check out the picture of Brian Davis on this page you can see him holding up the etch mask I don`t see anything that looks like a socket....

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DC motor speed controller circuit, applies two timers connected as a Pulse Width Modulator. The chip put into use will be an nmos dual timer/oscillator NE556..

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. ..

The circuit is bell timer. This new project uses AT89S52 microcontroller and I2C EEPROM to store the alarm timings. Also the 7segment display is replaced with LCD display. DS1307 is used for Real time clock. The user can store upto 25 bell timings and they....

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 vo....

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....

555 Timer With Audio Alarm Circuit Here is a very simple circuit for electronic timer with audio alarm. With the help of this circuit, audio....

This circuit is the opposite of Repeating Timer No.3. Its operation can be limited to the hours of darkness. Again - the variable resistor (preset) lets you choose the level of darkness at which the timer will begin to function....

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So you`re either revved up about building one of these for yourself or you`re just reading on because you`ve nothing better to do. I can understand that. So let`s begin with a set of schematics: Don`t be confused by this - it`s your basic 555 timer....

A dual tone model train horn/sound generator/simulator circuit can be made using two NE 555 timers connected in cascade. But here circuit diagram is designed with NE 556 IC, which is nothing but two 555 in one package....

This is a SCR timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constanst of this circuit is determined by R1 and C1. The buzzer will sound when C1 charges up to a desired level, it will cause the Q1 to conduct and triggers....

A microcontroller is a single-chip computer. It has internal RAM, ROM, timers, counters, interrupt circuitry, I/O ports, analog comparators, serial USARTs, analog to digital converters, watchdog timers, and a RISC architecture. When you are using a....

The water sensor circuit is based on a 555 timer circuit and come common electronic components. The water sensor is made by two metal electrodes arranged very close that a drop of water (liquid) will bridge them. If the liquid ( water ) is very pure you may....

This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 timer is used as astable oscillator in this circuit. When this circuit is under dry conditions the....

A monostable multivibrator (MMV) often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network, connected externally to the 555 timer. In such a vibrator, one state of output is stable....

One of ZiLOG`s most popular Z8 One Time Programmables (OTPs), the Z86E02 features a 512-byte EPROM 61 bytes of RAM, 14 I/Os, Watch-Dog Timer Power- On-Reset, a Low-Voltage Protection circuit and one additional Timer Special fea- tures on the Z86E02 include....

The time can be set with a potentiometer between 1 minute and 1023 minutes, about 17 hours. A pushbutton starts the time, turns on a relais and the timer will turn off the relais when the time is elapsed. It can be switched to seconds for a shorter time....

This project is a simple 12V to 220V modified sine-wave inverter using 555 timer IC and CD4017 decade counter. This inverter can deliver 300W continuous power and around 500W max power output (short period). A very good inverter for uninterruptible power....

If you go to most supermarkets today you will see plug in mains powered digital programmable timers. These are designed to be used to automatically turn lights on and off, to turn washing machines on when you are out and so on. Prices start from as little as....

This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5....

The signal has three wires: common, "walk", and "don`t walk". This page describes the operation of the unit`s countdown feature. The information and examples provided here should work for other models and brands of signals. Click here togo to the beginning....