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555 Timer Circuits
555 Timer Circuits
Low Cost Pulse Generator circuit
This pulse generator produces square pulses from 1Hz to 100KHz with adjustable pulse width of nearly 0-100%. The generator is powered with a voltage of 5-15V and is therefore suitable for both TTL and CMOS circuits. If you want to measure the response of an amplifier or give timing pulses to a variable frequency digital circuit or drive a pulse...
555 Music lantern controller circuit diagram
Controller as shown, including the acoustic-electric conversion and amplification circuit, a clock pulse generator, counting circuit and control circuit. It controls four accom
Monitor circuit diagram with over 555
Depending on the external circuit connection, 555 may be formed start delay, trigger delay, multi-harmonic oscillation mode and other working conditions, it is with some RC com
555 Dream lantern control circuit diagram
Fantasy lights, wonderful changes can be used to store, dance hall or family holiday decorations. Its control circuit is shown. Lantern multivibrator control circuit, a control
Electronic Peacock by the CD4017 NE555 circuit diagram consisting of the opening screen
Electronic decorative peacock composed of 10 light-emitting diodes, each light emitting diode includes a plurality of light-emitting diodes, light-emitting diodes mounted in th
555 Astable oscillator
This free-running multivibrator uses an external current sink to discharge the timing capacitor, C. Therefore, interval ^ may easily be 1000 the pulse duration, t1( which defines a positive output. Capacitor voltage, V^, is a negative going ramp with exponential rise during the pulse output periods.
Long time delay
In the 556 timer, the timing is a function of the charging rate of the external capacitor. For long time delays, expensive capacitors with extremely low leakage are required. The practicality of the components involved limits the time between pulses to something in the neighborhood of 10 minutes. To achieve longer time periods, both halves of a...
The unit provides a square-wave output that is rich in harmonic content. The circuit"s output frequency can be varied from 50 Hz to 15 kHz. The heart of the circuit is a 555 astable connected in its equal mark/space mode. The frequency is controlled by potentiometer R2 and capacitor Cl.
555 Based Alarm Circuit
The alarm circuit has a single 555 oscillator/timer (Ul) performing double duty; serving both in the alarm-trigger circuit arid the entry- delay circuit. In this application, the trigger input of IJ1 at pin 2 is held high via Rl. A normally-closed sensor switch, SI, supplies a positive voltage to the junction of R2 and CI, and lights LED1. With...
555 Fm Circuit Circuit
Circuit for applying a dc-coupled FM or PPM to a 555 configured as an oscillator. IC-1 - Motorola MC-1374P. IC-2 - National LH0002C. L1, L2 - Mouser Electronics #421IF200. C1. C2 - Silver mica, 300 pF. All 0.1 uF cap., ceramic disc, 16V. C3 - 100 uF, 10 V, electrolytic ADJUSTMENT: Adjust R1 for minimum carrier; signal from function generator...
This relatively simple, inexpensive circuit requiring one trimming operation can multiply or divide with a consistentaccuracy of greater than 1 part in 1,000. An inexpensive CMOS version of standard 555 timer chip T, in conjunction with low-drift LMll error amplifier A3, an inexpensive analog chopper switch SW, form a unique...
555 capacitance tester circuit diagram
The tester consists of an dual time base circuit 556 and a number of RC components and other components. Illustrated by the right half of the
0-60sec start-stop timer with 555
This timer is ideal for small aplications. Due to its simple structure, its usage and nevertheless its universal character, this mini timer is usable in the most current applications needing time intervals, from some seconds through approximately 60 minutes. By simple modifications it is possible to adjust the maximum time and the timing scale,...
555 Composition with Watchdog circuit
This circuit was originally a type of power-delay control circuit, the delay time by the timing element Rl, C1 decision. But with the "watchdog" circuit,
555 multi-purpose repair circuit diagram
The overhaul has the following features: online judge diodes, transistors is good or bad; test TTL logic level or a high impedance state; can output 37MHz, bar television signal 74MHz, 148MHz; the output 465kHz, 930kHz, 1395kHz AM signal. As illustrated, 555 and R5,
555 automatic power-protection circuit diagram
Shown automatic power-protection circuit. This protection consists of step-down rectifier circuit, overvoltage and undervoltage detection circuit, delay switch control circuit.
Nature simulator with 555 circuit
Circuit works: an integrated circuit lC (NE555) and R, RP, C3 substandard elements constituting around astable multivibrator, lC 3 feet square wave oscillation signal output from the current limiting resistor R2 is added to the TRIAC vs the control terminal,
A control circuit diagram 555 pairs steady mode
555 bistable mode, stable and non-stable than single modes of application is relatively less. Bistable mode means that the circuit composed by R-S trigger mode. As shown by a m
One group of integrated circuits using electrical circuit 555 when the load limit
555 limit when one group integrated electrical circuit load circuit is shown. It can limit the large load electric power. When the electricity load exceeds a set value, automat
555 precision temperature sensor with temperature frequency converting circuit diagram
555 precision temperature sensor with temperature frequency converting circuit diagram consisting of:
555 make use of digital amplifier circuit diagram
Also known as digital amplifier Class-D amplifier with small size, high efficiency characteristics. Here are a circuit made easy with 555 Class D amplifier. It is the use of ci
555-pin chip data and circuit diagrams
Any time base circuit 555, the internal structure of the same circuit, the performance is the same. When there are many manufacturers base circuit 555 models, such as MC555, CA
555 multi-temperature test circuit configuration
As shown in Fig multi-channel temperature measurement circuit. The test circuit consists of a core consisting of 555 one-shot delay circuit. When the button i
The pulse width detection circuit 555
As shown in Fig pulse-width detection circuit. The detection circuit by the differential circuit (R2, C2), amplifier BG1, single stabilizing circuit (555, R1,
Five uses tri-state logic audio pen CD4066 555
As shown in Figure five uses tri-state logic pen audio circuit. The circuit mainly by the multivibrator, four-way switch CD4066 (IC1) circuit with some RC com
The use of low frequency oscillation base 555 circuit made flashing light circuit Circuit II
As shown circuit 555 is at the core of the flash circuit, when their normal work, the light emitting diode and VD2 will VDl alternating flashing circuit principle summarized as
555 light tester circuit diagram
As shown constituting the photoelectric conversion by the photoelectric sensors and switches 555, etc., issued by a music song to prompt IC2. Illuminance sensor parts are made
555 sound logic level probe
As shown for the acoustic logic level probe circuit. The probe consists of a voltage comparator, multivibrator, piezoelectric ceramics HTD and other components. Wherein the com
555 capacitance frequency transistor-line detector
As shown for the capacitor, the frequency detecting circuit transistor line. Can be converted by adjusting the preset switch K1 when this detector capacitance, frequency, trans
555 electrical equipment overload and a phase circuit protection device
As shown for the electrical equipment overload and phase failure protection circuitry. The device consists of + 12V, + 5V DC power supply, AC transformer, voltage comparators,
Level 555 a control circuit diagram
As shown for the level control circuit. The control circuit consists of step-down rectifier circuit, trigger circuit 555 (IC1, IC2), relay control circuit. Where the buck recti
555 lights remind
As shown for the lights to remind the circuit. The circuit consists of monostable delay circuit, driving circuit, buzzer, light-emitting diodes and other components. Wherein th
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