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8051 / 8052
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Interconnection & Timing
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Meter Counter Circuits
SimpleTimer with Musical Alarm
The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this circuit operates in 9V its standby current drain is very low. The time delay of timer circuit can be adjusted by adjusting the preset VR1. The base of npn transistor T1 is connected to pin 3 of IC1 through resistor R4 and its emitter terminal is connec
555 timer astable multivibrator
In the following astable multivibrator circuit, in some books, it is mentioned that the duty cycle id d=( R1+R2)/(R1+2*R2) in some other books, it is..
555 Timer as an Analog to Digital Converter
This 555 timer based circuit is a kind of voltmeter, also an analog to digital converter, that converts the analog input voltage to digital output pulses
IR Interval Timer for Pentax DSLR Camera
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..
555 Timer Circuit With Variable On/Off Times
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..
555 Timer Clap Switch
This 555 timer clap switch circuit electronic project is designed using some common electronic parts. This 555 timer clap switch circuit electronic projec..
A Bedside Lamp Timer Circuit Schematic
The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. It is useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep After turn-on by P1 pushbutton, the LED illuminates for around 25 minutes, but then it starts
Alarm Circuit for Snoring Prevention by 555 Timer
The circuit was designed to produce a circuit that will alarm a sleeping person to prevent snoring by using a vibrator instead of an audio alert so as not..
Amplifier Timer Circuit Schematic
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..
High Low Voltage Cutout Without Timer
This inexpensive circuit can be connected to an air-conditioner/fridge or to any other sophisticated electrical appliance for its protection. Generally, c..
Voltage Controlled Switch using 555 Timer
In this circuit the 555 timer is used in a novel way, as a voltage controlled switch.The old and omnipresent NE555 can be very good at someth..
Jammer Circuit Using 555 Timer
sir, we are very much interested in design of jammer circuit, even we started working on it but there is some problem with our circuit i.e signal is not getting jamm..
555 timer audio alarm circuits
This is danger beep circuit. It use 555 integrated number circuits build to are a stable mutivibrator that be valuable duty cycle 5% driver loudspeaker..
Simple Pulse Generator by IC 555 Timer
This is a simple pulse generator circuit or standard astable oscillator circuit for IC 555 timer,NE555N IC. Use for..
Simple Timer by CA3140 + NE555
This be the circuit sets the time to model is simple,at can fix the time had long ago and have tall good accuracy. By use pillar equipment be IC CA3140 for..
12V power inverter using 555 timer circuit
This 12V power inverter circuit can be used to power small power devices that need a 240 volts. This 12V power inverter circuit is very useful when you want to use a 240 volts consumer powered by a 12 volts car battery. In contrast to the usual feedback oscillator type of inverter, the oscillator of this inverter use a 555 timer connected as an
555 timer circuit temperature monitoring system
This 555 timer circuit temperature monitoring system electronic project can be monitor temperature in up to four points. Using this 555 timer circuit temperature monitoring system electronic project can be choose if the alarm should be triggered when temperature is increased or decreased. This depends on the resistance R10. If you connect R10 betw
555 timer Clap switch circuit electronic project
This 555timer clap switch circuit electronic project is designed using some common electronic parts. This 555 timer clap switch circuit electronic project operates from a distance of up to 10 meters from the microphone. Signal from microphone is amplified by transistors T1, T2 and T3. Diode D1 detects clap signals and the resulting positive volt
555 timer Door minder electronic project circuit diagram
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 project is suitable for detecting customers entering a shop, cars coming up a driveway, etc
555 timer Led Flasher circuit electronic project
This LED Flasher circuit is based on the 555 timer IC. The LED Flasher circuit diagram is very simple and require few external components. When the circuit is working the red LEDs will flash at a set frequency one by one like at the railway crossing indicator.
DC motor control using 555 timer circuit
Using this 555 timer DC motor control electronic project you can control speed of a 6 volts DC motor, by simply rotate left or right the 50 k potentiometer.
DC motor speed controller with 555 timer
Speed regulation is accomplished by sensing the motor current with R17 and using it as positive feedback to compensate for motor resistance loss. The gain pot should be set to a point just below the point where the motor speed oscillates. After finding this point, you may want to change the value of R11 to get better speed control range. Q3 limits
Door open alarm using 555 timer circuit
This door open alarm electronic project is designed using an linear hall effect device and a 555 timer circuit. This door open alarm alarm electronic project is based on the TL3103 linear hall effect device used for detecting the angle of rotation. The TL3103s are centered in the gap of a U-shaped permanent magnet. Usually a 555 timer circuit is t
Smoke detector using 555 timer circuit
This smoke detector is designed using 555 timer circuit and some common electronic components. The photo interrupter module is used as the smoke detector, while timer 555 is wired in astable configuration as an AF oscillator for sounding alarm via a loudspeaker. In the absence of any smoke, the gap of photo interrupter module is clear and the ligh
Voltage doubler circuit using 555 timer
This voltage doubler circuit use a 555 timer integrated circuit wired as an astable mutivibrator. This voltage doubler circuit can deliver only up to 50mA output current and above that current limit the output voltage will be reduced. The actual output voltage will be around 22V for a 12V DC input and also the output voltage will be a bit unstable
Water sensor circuit using 555 timer
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 change the resistor value to 2. 2m ohms and if the circuit is give false alarm sensing you
Metal detector with 555 timer
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.
12V DC Light Dimmer Circuit Using 555 Timer IC
When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the lower position, the capacitor will charge through both 1k resistors and the 50k potentiometer
555 Timer Time Delay Circuit
555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes..
555 Timer With Audio Alarm Circuit
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..
CD4060 Timer Circuit 1 minute to 2 hours
CD4060 Timer Circuit 1 minute to 2 hours This is a 1 minute to two-hour timer switch. The 14-stage binary ripple counter Type 4060, IC1, has an..
Frequency Meter Circuits
VU Meter Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial