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Metal Detector Circuits
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Data Bus Circuits
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RF Converter Circuits
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Video Wall circuits
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8051 / 8052
PCB CAD Software
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H Bridge Circuit
DIY HV Variable Cap
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Digital Signal Integrity
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4 Band Resistor
5 Band resistor
6 Band resistor
Light Laser LED Circuits
One infrared burglar alarm circuit
Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked by the body, namely the police. It consists of an infrared light emitting circuit and reception circuit
Infrared remote control a dimming circuit
(1) infrared transmitter circuit of the infrared transmitter circuit shown in Figure 18-la. By transistors VT1, VT2 and RC components and the like more than a flop. Multivibrator works; Kun brother were VT2, VT1 base bias resistors, closing the switch SA plus
A circuit of a pyroelectric infrared switch application BISS0001
BISS0001 is a sensor signal processing with higher performance integrated circuits, which together with the pyroelectric infrared sensors and a small amount of external components constitute passive pyroelectric infrared switch. It can automatically
Coke Thermal infrared detection circuit OPA111
An application focus infrared heat is radiated by an object while the object of infrared non-contact temperature measurement, since the detection of the measured signal is very
Infrared receiver circuit diagram with a pre-integrated amplifiers
As shown, the circuit due to the integrated amplifier, so the circuit is simple, small size. TDA4050 IC used here, a weak signal is received by the infrared photodiode VD, firs
Homemade infrared automatic door controller circuit
Automatic door control and the market price of finished executing agency generally high, the proposed method will be suitable for homemade use, the components used are easy to
Pyroelectric infrared processing chip BISS0001 and pyroelectric elements D204B
BISS0001 is a sensor signal processing integrated circuit with higher performance, it is accompanied pyroelectric infrared sensors and a small amount of external components con
Using TX05C new infrared burglar alarm circuit diagram
But here is a new type of infrared using TX05C radio sensor module made of doors and windows burglar alarm. Because it is not visible to the human eye utilizing infrared, wirel
BH-SK-1 with the production of non-contact infrared light switch
By BH-SK-I produced non-contact infrared lamp switch circuit shown in Figure 3-42, it is mainly by voice integrated circuits, infrared light-emitting tube and receiving tube, c
Narrow pulse infrared light emitting circuit
By the time-base integrated circuit 555, the transistor VT and a few external components to form a multivibrator circuit charge and discharge time constant Ti and V, where Ti 0
Multivibrator infrared transmitter circuit
By transistors VT1, VT2 and RC components, etc. to form a multivibrator. Multivibrator works: Ra, R4 are VT2, VT1 base bias resistor, closing the switch SA after the power volt
IR Link PIC tranceiver
I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote control) store them in RAM & EEPROM and transmit any IR op-code to the RCX in turn. Included in the firmware is a routine that takes any opcode(s) and expand it to the proper IR packet for...
Day and Night Infrared Detection
The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit. A phototransistor is mounted between the rails so that it is covered by the train as it passes. A system widely used in model railroading. For daytime operation the room lights would be...
Serial port controlled infrared transmitter with PIC
This is a programmable infrared (remote control) transmitter, which can be controlled from a PC serial port. It is capable of sending many remote control formats, including the Philips RC-5 standard. Exact formats with the timing parameter names are shown on the pictures:
A Serial Infrared Remote Controller
This is a simple, cheap device that can be connected to any serial port to control most components that have infrared remote controls. I designed and built it (on a solderless breadboard) in 1991. In 1992 I wrote a lengthy description of it for an electronics class. In 1994 I finally designed a PC board for it, using a free, X-based PC board...
A Low Cost 4Mbps IrDA Receiver
The LT1328, in the MS8 and SO-8 packages, contains all the necessary circuitry to convert current pulses from an external photodiode to a digital TTL output while rejecting unwanted lower frequency interference. The LT1328 plus fi ve external components is all that is required to make the IrDA-compatible receiver shown in Figure 1. An...
Infrared circuits for remote control
Infrared remote controls are using a 32-56 kHz modulated square wave for communication. These circuits are used to transmit a 1-4 kHz digital signal (OOK modulation) through infra light (this is the maximum attainable speed, 1000-4000 bits per sec). The transmitter oscillator runs with adjustable frequency in the 32-56kHz range, and is being...
Simple Sensitive Remote Control Tester
Here is a handy gadget for test- ing of infrared (IR) based re- mote control transmitters used for TVs and VCRs etc. The IR signals from a remote control transmitter are sensed by the IR sensor module in the tester and its output at pin 2 goes low. This in turn switches on transistor T1 and causes LED1 to blink. At the same time, the buzzer...
REMOTE-OPERATED MUSICAL BELL
This infrared light controlled 12-tone musical bell can be operated using any TV remote control. It can be operated from up to 10 meters, provided the remote control is directed towards the sensor.
Infrared Remote Home Control software
By using Fujitsu (Japan) "IR-Commander" or "Crossam2+ ( Japan ) ", you get high reliability computerized home control environment. IR Commander is a multi-function adapter that supported IrDA / ASK / 24 feet 360 degree TV-Remote. Crossam2+ is the remotes which equipped RS-232. I recommend above two devices. Another selection, use Actisys...
Infrared gate 2
This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output wich can turn on a ventillator. The time period the output is turned on can be...
Single Zone CMOS Alarm
This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It has provision for normally open and normally closed switches and will accommodate the usual input devices such as Foil Tape, Pressure Mats, Magnetic Reed Contacts, Passive Infrared Detectors and Inertia (Shock) Sensors.
Infrared Heart Pulse Monitor
Senses heart pulse by means of an infrared earlobe clip. Reverse engineered circuit diagram of heart pulse sensor circuit board out of a treadmill. Notice that the output is level shifted for use by CMOS logic running on 4.5V regulated down from the 6V battery. The CMOS logic also controlls the power to the analog circuitry and infrared LED.
Basic IR Detector/Emitter
This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles.
Across The Track Infrared Detectors
This page presents information on infrared - `Across The Track` train detection circuits. The circuits are designed around the LM339 comparator chip and can use a wide assortment of matched infrared - emitter / detector pairs. The basic circuit shown below has been tested with sensor gaps as wide as 12 inches but a distance of 8 inches or less...
Visible and Infrared Light Detectors
The sensors used are silicon phototransistors and Cadmium Sulfide (CdS) photocells. Both of these sensors allow less current to flow when they are dark than when lighted. Phototransistors change their conductance while photocells change their resistance depending on the intensity of the light falling on them. All of the detectors on this page...
8 Photo-Detector Circuit Board
The circuit on this page is for a simple light detector circuit board that has 8 detectors that can be used with visible or infrared light systems. The detectors use LM339 voltage comparators as the active element. Phototransistors or CdS photocells can be used as sensors for this circuit. If phototransistors are used the circuits can also be...
Infra/radio remote control transmitter/receiver with PIC
This is a general purpose remote control project with using programmable PIC microcontrollers. Schematics are shown for using infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Well-known such IC-s are Holtek HT-12D, HT-12E and Motorola...
Use a system`s real-time clock to "hide" a code sequence
Although the concept of a totally accessible system represents an ideal situation for users, designers now must limit access toand conceal code sequences forsoftware routines for calibration, diagnostics, memory erasure, system reset, and more. In a system that includes a computer-compatible interface, such as an RS-232, a GPIB, or an...
Temperature-measurement scheme uses IR sensor and sigma-delta ADC
Many noncontact temperature-measurement systems use infrared sensors, such as thermopiles, which can detect small amounts of heat radiation. Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as do automotive-HVAC systems that adjust temperature zones based on the body temperature...
Radio Remote Control using DTMF Circuit
This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Usually remote control circuits make use of infrared light to transmit control signals. Their use is thus limited to a very confined area and line-of-sight. However, this circuit makes use of radio frequency to...
Precision Digital Altimeter
The current concept incorporates a wireless transmitter and receiver and is thought to be used for remote controlled airplanes or appliances with two seperate parts. In other words, we have one dedicated transmitter (acquisition, filtering) and one dedicated receiver part (user-interface, look-up table, calibration, storage), capable of being...
Light Sensing Circuits
Light Dimmer 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