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lighting governor using 555 timer ic
SMOKE DETECTOR USING 555 TIMER
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 an astable multivibrator and sensor (Photo interrupter module). The sensing module trig
TV REMOTE JAMMER CIRCUIT USING 555 TIMER
A Tv remote jammer circuit, using NE555 timer IC. By using this you can watch your favorite TV channel without any interruptions. Ie; No one can be able to change the channel by means of remote, if the circuit remains ON. The circuit is simple to make at your own home, with very low cost. Let`s go deeply into the specification and requirem
Simple NE555 IC Testing Circuit
Ne555 is one of the most commonly used timer IC. It is a monolithic timing circuit that can produce accurate and highly stable time delays or oscillations. Like general purpose OP AMPs, it is very much reliable, easy to use and cheaper in cost. It has a variety of applications including monostable and astable multivibrators, dc-dc converters,...
555 Timer LED Flasher Circuit
All of the parts in this list are generally available through Radioshack for less than $20. I highly recommend using breadboard! You`re bound to make mistakes your first time and soldering it will only make your fail worse (double fail ). I`ve compiled this tutorial into two "methods", one is the classic schematic and the other is a step by step g
An op-amp made from 555 chips
Is it possible to make an op-amp out of nothing but 555 chips and passive components? Not a terribly practical question, given the existence of very inexpensive and capable op-amps covering every corner of op-amp performance space; but it has some aesthetic appeal. If you find yourself on a desert island with nothing but a pile of 555s and a...
Camera external shutter circuit 555 timer
Having wired the camera with external shutter leads I now needed a way to trip them. They needed to be tripped (i. e. connected together via a relay) at a regular interval, perhaps 2 seconds, starting at launch. I had read that a 555 timer chip configured as a multivibrator can work. I purchased Engineer`sas a timer. Mini-Notebook, 555 Timer...
Electronic Circuit Schematic Dimmer LED using LM555 for Photo/Build Light
Maybe you ever use LM555 as timer project before, yes it also nice if you want to make analog timer using LM555. According datasheet LM555 this IC can use for several purpose in electronic project like to adjust timer according time needed. From figure 1 above, we can describe that we can adjust dimmer LED with adjust P1 50K that connected with...
Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F
All components that used in Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F. Main component in this circuit is IC NE555, Led IR, Phototransistor L14F and IC LM1458. Moving sensor / detector schematic diagram divided into two parts, there are transmitter and receiver. Transmitter part is the par
Electronic Circuit Schematic of Touch Sensor using NE555 Based Proteus Software Simulation
Electronic Circuit Schematic of Servo Motor Controller using IC NE555
Five uses tri-state audio logic pen (CD4066 555) circuit diagram
Five uses tri-state audio logic pen (CD4066, 555) circuit diagram is shown as the chart. The circuit is mainly composed of the multivibrator, the four-way switch CD4066 (IC1) and the gate circuit composed of some RC components. Multivibrator is composed of the 555 (IC2) and R7, R8, R9, C1, and its frequency is controlled by IC1-3 on-off state.
Sequence timer diagram composed by NE555
This is the sequence timer diagram composed by NE555. The timer can set time any time when the power is connected, break and control the external system to work. In the circuit, K1-K3 are relays used to control the corresponding system to work, adjust the resistance of the RP1-RP3, which can change the break time of the relay. The pin 2 and 6
The inverter circuit diagram composed of NE555
The inverter circuit diagram composed of NE555 is shown as the chart, and it can turn +12V DC battery voltage to 220V AC output voltage. In the circuit, NE555 circuit is the oscillator, the oscillation frequency is decided by the R1, RP1 and C1, and adjusting the resistance of RP1 in 50HZ, one way of the pulse signal output by NE555`s pin 3 is...
frequency conversion circuit composed of NE555
In the circuit, NE555`s oscillation frequency is controlled by the VT2, and during its pin 3 in the low output waveform (output waveform of the T1 period), as VTI stops, VT2 is conduction with current Ic2 flowing, and the size is controlled by the output voltage of Al. C2 discharge time T1 = C2U2 / (2Ic2), in the formula, Uz is the stable...
555 alarm doorbell and lighting controller circuit
As the figure 15-24 shows, the controller circuit is composed of the switch type Hall integrated circuit DN838 and the astable multivibrator (composed of the 555), this circuit can be used in wide range of applications such as the automatic door opening, automatic delay alarm, automatically turns off the lights and also it can be used as the...
555 camera flash delay circuit
As the figure 17-1 showns, the camera flash delay circuit can be used to capture the high-speed scene, and you can get a very short exposure time. The light door is composed of the luminous diode and the 3DU type photosensitive tube. When the light is shadowed, the positive transition pulse adds to the VT2. The IC1(555) is triggered by the...
555 four words cycle neon light light control circuit
This control circuit is composed of the AC step-down rectifier circuit, the astable multivibrator, the timing control circuit, the optocoupler circuit and the SCR driving circuit.etc. As the figure 17-61 shows. The astable multivibrator is composed of the IC2(555) and R2?R3?RP1?C3.etc. It`s frequency depends on RC`s charging and discharging time...
555 time control password electronic doorbell circuit
As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit sends out the alarm sound. If it exceeds the specified time or the password is wrong,...
A bean sprouts automatic watering controller consisting of 555 circuit
Figure shows the bean sprouts automatic watering control circuit. The controller consists of step-down rectifier circuit, power outage told implement (IC3), timing control circuit (IC1), temperature control circuit(IC2) and so on. The step-down rectifier circuit is VDD = +7 V DC voltage provided by the whole controller. The power outage told...
Motor time division control circuit composed of transistor and NE555
Figure 2-32 (a) shows the time control diagram, and the motor is operated by the switch S1. When Sl is turned to 1, the power driver circuit provides current to the motor for running; When S1 is turned to 2, the drive current is cut off, and the electric motor is used as a generator to hold out the back electromotive force by the sampling...
Robot control circuit composed of transistor and NE555
Figure 2-33 (a) is the action schematic diagram of the robot closing to the object. When there is no objects in front of the robot, it will go forward in the straight line; when there is an object in left or right side of the robot,it will turn left or right to close to the object. Figure 2-33 (b) is the block diagram to achieve this action....
The NE555 FM modulation circuit
In the figure is the NE555 FM modulation circuit. In the figure, NE555 7-pin is connected with a FM modulation circuit which is composed with R5 and C2, but the frequency range is kind of small. VT1 and VT2 form a current Miller circuit, which generates a charging current in the charging circuit, the current magnitude is decided by R2 and RP1....
Ultrasonic Liquid Level Indicator Circuit Composed Of NE555
The picture shows the ultrasonic liquid level indicator circuit. This circuit is made up of ultrasonic transmitter circuit and receiver circuit.The ultrasonic transmitter circuit is made up of 555, R1, W1, C1 and ultrasonic transmitter head UCM40T. The ultrasonic receiver circuit is made up of the corresponding receiving head UCM40R, cascade...
555 ASTABLE_FREQUENCY METER
The circuit shown is a simple digital frequency meter, which indicates the frequency in hertz of an astable 555 timer. It could, perhaps, be adapted for other uses. An NPN transistor, TR2, is connected to the 555 astable to be measured, as shown in the in-set, and the output signal obtained is hooked to the main circuit via transistor TR1...
Circuit Diagram of Audio Logic Level Probe Composed of 555
The above picture is audio logic level probe circuit, which is composed of voltage comparator, multivibrator, and piezoelectric ceramics HTD etc. The latter two constitute audio circuit and the audio frequency is used to assess the TTL or COMOS instrument s electrical level. When the probe reaches high level, IC-1 sends out signal to make D2...
DC capacitor tester circuit diagram composed of 555
DC capacitor tester circuit diagram composed of 555 is shown as the chart. The tester is composed of the pulse generator, one-shot, DC amplifier and meter indication circuit. It can measures the npF ~ 10?F capacitor. The range is divided into 0 ~ 100PF, 0 ~ 1nF, 0 ~ 10nF, 0 ~ 100nF, 0 ~ 1?F, 0 ~ 10?F..
555 point-frequency TV terminal circuit
As the figure 14-17 shows, this circuit is composed of the input circuit, the line frequency synchronization generator, the sample-and-hold circuit, the voltage control delay generator and the RF modulator.The input circuit is composed of the input attenuator RP1 and the emitter follower VT1. The astable multivibrator is composed of the IC2 and...
555 simple electronic keyboard circuit (2)
As the figure 14-41 shows, the multivibrator is composed of the 555 and some capacitance resistance components, the oscillation frequency depends on the values of Ra, R16 and C3. f=1.44/(Ra+2R16)C3, the Ra of the formula corresponds to the different values of R1-R15, this depends on the situation of the keys K1-K15. When you are debugging the...
555 toilet floodlight and ventilator automatic control circuit
The electronic switch is composed of the CK-4 type magnetic control switch and the VT1?R1?R2. When the bathroom door closes, the permanent magnet ZT and the reed pipe GA get close to separate the two touch tablets of GA, VT1 cuts off, pin-2 of IC has the high level voltage, 555 is in the reset state, J releases, the ventilation fan and light has...
The function generator composed of 555 timer
The chart shows a function generator circuit composed of 555 timer. The circuit consists of a CH7555 timer and some transistors and RC components. It can generate triangle wave, square wave, sine wave, sawtooth and square wave sweep simultaneously. Ramp can be positive or negative. The frequency of various waveforms is adjustable from 0.1Hz ~...
555 dual astable multivibrator circuit diagram
The circuit includes two synchronized multivibrators which are composed ofone pair of 555time base circuits. The circuit can output two synchronized pulse signals,and the spacing and frequency can be changed by adjusting the time constant. The circuit is flexible and convenient. When C1=C2=C, the oscillation frequency. The ducy cycle depends on...
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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...
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