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555 Timer Circuits
555 Timer Circuits
Voltage Controlled Oscillator using NE555
A voltage-controlled oscillator using NE555 The circuit is usually known as a voltage-to-frequency converter as a result of the output frequency will be modified by changing the input voltage. As mentioned in previous blog posts, pin 5 terminal is voltage control terminal and its function is to manage the edge and trigger levels. Normally, the con
Extend Timer Range For The 555
Anyone who has designed circuits using the 555 timer chip will, at some time have wished that it could be programmed for longer timing periods. Timing periods greater than a few minutes are difficult to achieve because component leakage currents in large timing capacitors become significant. There is however no reason to opt for a purely digital s
Simple Astable 555 Timer IC Flasher
For a lower parts count than the 2 transistor multivibrators, 2 LEDs can be alternately flashed with a 555 integrated circuit configured as shown in Schematic 2. I chose the combination of a 2K2 and a 47K resistor to determine the oscillation frequency along with the 10 uF capacitor connected to pins 2 and 6. You can practically change the (R Spee
Membuat Pemancar Ultrasonic Dengan IC 555
Capacitors and the 555 Timer
ECEN 2250 myDAQ Experiment Capacitors and the 555 Timer.
555 Duty Cycle Control
A simple oscillator circuit that varies the duty cycle over a wide range without affecting the frequency. It is a variation of the simple 555 astable oscillator. Initially, I told a reader that there was no standard 555 circuit that could do this, but then the grey matter started working. The use of an air-variable capacitor for frequency
555 timer led flasher circuit
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.
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
tea5551t am radio receiver circuit design electronic project
Using TEA5551T monolithic integrated radio circuit can be designed a AM radio receiver circuit which is designed for use as a portable radio receiver with headphones. The TEA5551T radio receiver circuit contains all is needed for a AM radio receiver circuit (a complete AM part and dual AF amplifier with low quiescent current). Because in most cas
metal detector 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.
Wide Frequency Range 555 VCO
The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted. Q2 is connected in the common base configuration. In this mode of operation, the collector curren
Infrared Transmitter-Receiver with 555
Infrared transmitter and receiver circuit shown in the schematic diagram below can be used as remote control. The transmitter is basically an oscillator circuit, and the frequency can be adjusted using R1 potentiometer (or trimmer pot). This oscillation makes sure if the signal can be distinguished from other source by the receiver. The receiver i
Whats Better For Timing Chores: A 555 Or A Microcontroller
Micro or analog? These days it is getting harder to choose. The 555 timer was the benchmark of flexibility. How does it fare today?.
White LED Voltage Booster Uses 555 Timer IC
This voltage-booster circuit for driving one or more white LEDs uses a 555 timer as its main element ( see the figure ). The timer, IC1, functions as a resettable astable multivibrator where R1, R2, and C2 are the timing components. When the supply voltage, VS, is first applied, D1 conducts and reservoir capacitor C1 charges to a voltage just less
Create a flash-then-steady LED using a 555 timer
The circuit shown flashes the LED briefly (to get your attention) and stays on as long as the power is on ( Fig. 1 ). The venerable 555 timer IC can be put to use in this type of application. The circuit is a standard astable multivibrator with resistors RA, RB, and the timing capacitor C1. To operate as a free-running astable, the reset pin 4...
Beeper Using 1C 555
Here is a `beeper` circuit employing two 555 ICs. It can be used in various circuits (having supply voltage of 5 to-15V DC) that require an alarm or a `beeping` signal. IC1 is connected in astable mode in the circuit in such a way that squarewave output at about 1 Hz is obtained. lC2is also connected in astable mode, but it gives an output with ab
555 Timer IC for Square Wave Generator Application
You can start to set your Square Wave Generator up using 555 timer IC through the circuit shown above. Find it match with the pinout of 555 timer IC. The osciloscope is then connected to the output of 555 timer IC in order to view the square wave. From the oscilloscope you can measure the wave frequency and verify it by varying the resistance in
Low-power inverter using LM555 Timer IC
This document describes a basic circuit that can be used to power high impedance, high voltage, low current devices such as EL backlights and fluorescent tubes. This project got its genesis when I needed a simple, yet flexible inverter circuit for an EL backlight, using a 12 volt input. My specific need was to power the backlight for the wildly po
555 LED Pulsing Breathing Circuit
Here is a circuit for simulating breathing / pulsing LED with the 555 timer chip. It became very popular and i received many comments and emails with people that made this circuit and worked fine, as well as comments with people that had troubles converting it to operate at 12 volts supply. It was designed to operate with 5 volts, because i plan...
AM Radio built around LM555
AM radio built around 555 timer chip. The only active device (silicon, germanium, or otherwise) is the LM555. The tuning is accomplished with an inductor and a capacitor, and the LM555 acts as an AM demodulator and class-D power amplifier to drive the speaker. You may be wondering how all this is accomplished with a 555. Here`s how the circuit wor
What determines the transmit frequency in this 555-based transmitter
Planning on basing a QRP transmitter off of this instructables project, seeing as I have a veritable plethora of 555 ics in my shack toolbox. The problem is, this transmitter is designed to operate a bit below the commerical AM band. How is the general operating frequency being set I`d like to get it set around the 1. 8 mhz band (160 meters)....
Why are 555 IC pin diagrams so random
Can I assume that most of the 555 chips from different manufacturers are interchangable (same pin configuration), however the programs/diagrams have pins that way just to look simpler I can always route my own weird ways on the actual chip to match the configuration in the schematics, however that is confusing due to it changing each time.
555 How can I make a 15 minute egg timer circuit
To do this, I want to push a button to initiate the timer, which will then light 3 x leds. After each 5 minute segment is up, one of the LEDs should go out. Finally, when 15 mins is up, I want to ring a bell (just once) using a solenoid. Trouble is - I don`t know where to start! My background in more in computer programming - so I understand the...
Where is the oscilator in the 555 chip provided here
design Functional difference between various astable 555 circuits
What is the purpose resistors and capacitor in this 555 circuit
It`s a typical AMV (Astable MultiVibrator) setup. The capacitor gets charged through both resistors until 2/3 Vcc is reached (internal comparator level). This sets a flip-flop which activates the Discharge output (DIS). Through DIS and the potentiometer, the capacitor is discharged until the voltage on the Trigger input (TRI) is 1/3 Vcc, which...
digital logic purpose of diode in this 555 timer application
Make a 555 timer base circuit such that O/P pin of 555 is held LOW by default at power on, and the I/P pin is held initially at HIGH at power on. The main requirement of my circuit is that until I/P pin is held LOW for say 200ms, then only the O/P pin must go HIGH and must remain HIGH as long as I/P pin is held LOW. What will happen if I pull up...
transistors Having difficulties using a darlington (BD681) to drive a 12V fan from an Arduino
Power a 12v fan using a darlington so I can control the speed from an Arduino. When I wire up as below nothing happens, even though I`m sending a PWM signal: Please draw a proper circuit. Edit your question and hit Ctrl+M, the current image is unreadable. Check your breadboard, most rows along the side are have one or two interruptio
Driving 72 leds with 555 timer
Make a circuit with a 555 timer to run 72 LEDs all at the same time. I have already made a circuit, but am not sure If it will work safe and long or not. I am putting the picture of the circuit and I want anybody who can help to look at it and see if it needs some extra components. Please add them on the circuit or explain instructions to add.
Getting more amperage from a 555 output
A drink mixer inspired by BAR2D2, I am using a gravity fed pump that is capable of running on a 9v battery. I am using a circuit with a 555 timer to control how long the pump will run. When I hook the pump directly to the battery the pump runs perfect. When I plug it onto my circuit, I get nothing. It turns out I am not getting enough amperage...
pcb design Need second set of eyes on 555 50% duty cycle soldered protoboard
Bold lines are soldered connections, arrows are wire based connections. Red for V_cc, Black for ground, blue for intermediate connection and gold for primary output. Pins 1, 5 are connected to ground (I recognize that 5 should go to a capacitor to ground, but have omitted it here as it worked without it on the breadboard and space was limited)...
RC Model Toy Circuits
H Bridge 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
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