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AC to DC & DC to DC
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Switching Power Supplies
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Data Bus Circuits
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RF Converter Circuits
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Video Wall circuits
TV Video Circuits
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PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
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4 Band Resistor
5 Band resistor
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555 Timer Circuits
555 Timer Circuits
555 Monostable Multivibrator
This circuit is a monostable multivibrator, or one-shot, made with a 555 timer chip. Click the logic input on the left (the "H"), and the output goes high for a short time, and then it goes low again. A timing interval starts when the trigger input ("tr") is brought low. When this happens, the 555 output goes high. This causes the capacitor to be
555 Sawtooth Oscillator
555 Square Wave Generator
555 1 Hz pulse generator
A simple buzzer to convert to an oscillating buzzer so as to obtain the sound similar to that of an automobile`s reverse indicator. I`ve posted a schematic(borrowed from electroschematics. com) below. I intent to replace the LED with my buzzer and omit the resistor. I hope by building this circuit, to make my buzzer `buzz`(or make noise) at an...
555 Am TransmitterCircuits
I have two ICM7555 CMOS 555 timers, and I was wondering if anyone has any good am radio transmitter circuits that incorporate two (or one!) 555 timers..
555 timer as a flip-flop
I have it set up so that I get an out put signal that goes High for about 1/2 second, and then goes low for about 1.33 seconds. The problem is that..
555 circuit for 8 leds flashing
LEDs are rated at only 30 mA continuous, whereas this circuit runs them at around 50 mA. Not a problem for a low duty cycle with short pulses, but this circuit as you intend has a high duty cycle. Where you might run into a problem is that you`re right at the maximum capacity of the output pin (200 mA). You might want to have the output pin
41 LED Flasher Circuit using 555 IC
I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the t..
555 Timer Astable Mode Circuit
As I described in the last step, setting the 555 timer up in astable mode causes it to output a continuous series of pulses. In this circuit, I`ll se..
555 timer based light seeking robot
The schematic diagram of this robot is very simple to understand. As I had mentioned earlier I just modified a circuit from on of the books to create..
555 timer based plasma speaker
This instructable will show you how to make an audio modulated plasma speaker using a flyback transformer out of an old CRT display, and the all time..
Build Your Own 555 Timer
The 555 timer. A chip so versatile that it has been used in everything from toys to spacecraft. A chip that can act as an oscillator, a schmitt trigge..
555Circuit and Breadboard Schematic
Make sure to double-check your connections using the circuit diagram and breadboard schematic (download from these links). You can use this while you..
Flashing LED using 555 Timer
Touch Sensitive On/Off Circuit 555 Timer
Make sure to double-check your connections using the circuit diagram and schematic below. You can use this while you follow along in the tutorial vide..
Small Strobe Light 555 astable multivibrator circuit
I recommend breadboarding the entire circuit first. It was way easier on a breadboard that trying to figure out what goes where on a tiny piece of pr..
Time Lapse Intervalometer for SLRs with 555 timer IC
This instructable started with my previous camera hack making a remote shutter release. I found a 555 timer tutorial and realized how great it would b..
555 Capacitor Tolerance Adjustment circuit
The 555 Timer shown below is configured as an 555 Astable Multivibrator previously discussed. However additional components have been added to enhance the operation of the circuit. As soon as the circuit is powered up the 555 will begin producing a square wave determined by the value of Capacitor C1 and Resistors R1 and R2, as determined by the ti
555 IC Astable multivibrator circuit
555 IC Monostable multivibrator circuit
555 IC Square Wave Oscillator circuit
A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. Basically two amplifiers cross-coupled with regenerative feedback, in it`s most simplistic form. One of the amplifiers is always conducting while the other amplifier is in cut off.In this case both...
555 Individual Pulse Width circuit
The Astable multivibrator circuit has no stable state. With no external signal applied, the internal transistors alternately switch from cutoff to saturation at a frequency determined by the RC time constants of the coupling circuits. So an Astable multivibrator is a square-wave oscillator with a oscillation frequency dependent on the value of the
555 timer ic operation
The 555 Timer is an integrated circuit used as a timer, a pulse generator, tone generator and many other circuit functions, all from one universal IC function. Each pin function is described and design recommendation are given when required. A Monostable Multivibrator setup is used as an example to describe the operation of the 555. The basic bloc
555 tone generator circuit
This circuit takes the outputs from two different 555 multivibrators and combines them using a summing Op Amp. Shown only to depict another implementation of a 555 timer, most of the back ground calculations being covered under the other topics in this section. The standard configuration for a 555 Astable multivibrator is shown to the left. The ci
Designing 555 Astables
If an oscillator of a particular frequency and mark to space ratio is required, (see Fig. 4. 4. 1) the method would be to calculate periodic time from the required frequency and the discharge time and charge time using the formulae for tD and tC described in Oscillators Module 4. 3. To do this, some component details will be needed. Starting...
The 555 Monostable
The 555 timer is so named because its primary mode of operation is intended to be in monostable mode. Operating as a monostable, it does not fit the strict definition of an oscillator because, unlike true oscillators, it requires an input signal to trigger its operation, however the fact that the 555 timer can be used in both monostable and astabl
555 audio oscillator
A oscilloscope would be useful in analyzing the waveforms produced by this circuit, but it is not essential. An audio detector is a very useful piece of test equipment for this experiment, especially if you don`t have an oscilloscope. The "555" integrated circuit is a general-purpose timer useful for a variety of functions. In this experiment, we
555 ramp generator
The voltage rating on the 470 µF capacitor is not critical, so long as it generously exceeds the maximum power supply voltage. In this particular circuit, that maximum voltage is 12 volts. Be sure you connect this capacitor in the circuit properly, respecting polarity! Again, we are using a 555 timer IC as an astable multivibrator, or oscillator.
Hydrogen Generator 555 Timer Pulse Width Modulation Circuit
How to Make a Hydrogen Generator 555 Timer Circuit PWM. This Pulse Width Modulation (PWM) Circuit could Produce Hydrogen on Demand..
A New Solar / Wind Charge Controller Based on the 555 Chip
I had the prototype working on the breadboard, I built another unit on a piece of Radio Shack Protoboard for use in the field. It came together in only a couple of hours, and again, worked the first time (I must be living right lately). This more rugged version will get mounted in a box and given a thorough testing in the field. Note that onthis...
555 timer travel touch alarm
voltage inverter using ic ne555
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
CMOS Circuits Tutorial