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Video Wall circuits
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8051 / 8052
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555 Timer Circuits
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555 Timer Circuits
555 Timer Circuits
Special sound audio oscillator circuit(NE555 CD4017)
The 555 electronic fishing game circuit
As shown on the figure 11-6, the fishing circuit consists of timing circuit and audio circuit. 555, RP1 and C1 make up the single shot circuit. The definite time: td=1.1RP1C1. The maximal definite time given by the figure is 15s.IC2 adopts the muisc integrated block HY101. In the IC1`s definite time, J is pull-in, the contact J1-1 and J1-2 is...
Led Flasher Circuit Using 555 IC
LED flasher circuit can be built based on 555 IC. Using 555 IC, the flashing rate can be more flexible to adjust. This LED flasher circuit is similar to our..
Pulse Position Modulator Using 555 IC
Pulse position modulation is similar to pulse width modulation, but the frequency is not constant. Like pulse width modulator circuit, pulse position..
Pulse Width Modulator Using 555 IC
A very simple pulse modulator circuit can be built using 555 IC. In 555 chip, a special modulator input is available at pin 5. Here is the schematic diagram of..
555 Oscillator With 50% Duty Cycle
To generate 50% active factor (duty cycle) using 555 IC, we can use two diodes to separate the charging and the discharging path. With no diodes, we can also..
TPS65552A Xenon Tube Flash Driver
The size of the photoflash charger circuit is greatly simplified and reduced by Texas Instrument (TI) TPS65552A. A photoflash capacitor charger based on this..
555 IC for Square Wave Tone Burst Generator
Square wave tone bursts is provided by depressing the pushbutton. It`s duration depends on the duration for which the voltage at Pin 4 exceeds a threshold..
Car Tachometer with 555 IC
Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don`t..
Driving Relay with 555 IC
This is a Driving Relay circuit using 555 IC. The circuit is used to drive a relay to avoid 555 hangs up, it uses an inductive feedback. The coil is prevented..
Oscilloscope-Triggered Sweep using 555 IC
We can use the 555 timer to hold the cost down of adding a triggered sweep to an economy oscilloscope. The timer is triggered by the circuit`s input op amp,..
555 IC Tone Burst Generator
An excellent tone burst generator can be made using 556 Dual Timer. We can connect the first half as a one-shot and the second half as an oscillator. The..
555 IC Water Level Sensor/Detector Alarm
This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 timer is used as astable oscillator in this circuit. When this circuit is under dry conditions the transistor will be fully off because it have no bias current. when the probes get wet, a sma
555 Infrared Transmitter-Receiver
Infrared transmitter and receiver circuit shown in the schematic diagram below can be used as remote control. The transmitter is basically an oscillator..
Voltage-To-Frequency Converter (VFC) with 555 IC
Voltage-to-frequency converter (VFC) circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit..
Extending 555 Timers Delay with Integrator
555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size..
555 IC LED Flasher for Up To 10 LEDs
This LED flasher circuit uses 555 IC, and is capable of driving up to LEDs. The good news is, the use of multiple LEDs in series doesn`t increase the power..
Supply Voltage Monitor with 555 IC
This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will..
Following in the footsteps of the "primitive" but quite successful 4 pin OM802 timer IC manufactured by the original SIGNETICS ITT - GEMINI chip fabrication plants way back in 1969 / 1970, a new and very innovative I. C. known as the " NE-555 " timer I. C. was released to the market, being introduced around May 1971 by the then Signetics...
Fundamentals of Electrical Engineering and Monostable Multivibrator
This is one of the most basic 555 circuits. This circuit is part of this chips datasheet, complete with the math needed to design to specification, and is one of the reasons a 555 is referred to as a timer. The green LED shown on the illustration lights when the 555 output is high (i. e. , switched to Vcc), and the red LED lights when the 555...
12 Volt Car Lamp Dimmer Circuit Design using 555 Timer
The following schematic diagram shows the 12 Volt Car Lamp Dimmer Circuit Design using 555 Timer. This circuit design can be used to dim a standard 25 watt..
commercial zapper using a 555
fake car alarm 555 led flash schematic
TV remote control Blocker Circuit Jammer using Ic 555 and IR Leds
Just point this small device at the TV and the remote gets jammed. The circuit is self explanatory. 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam. The transistor acts as a current source supplying roughly 25mA to the infra red LEDs. To increase...
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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity