Popular Circuits Page 172
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The Automatic Forklift System (AFS) is designed to make the process of stocking warehouses safer and more efficient. With current manually operated forklifts, employees are at risk of injury. The Automatic Forklift System (AFS) is designed to make the....
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This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes....
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This circuit is very basic to build. To open a lock which is connected to the K1 Load, you must press each momentary switch in the correct sequence. The sequence used in this circuit is S1, S2, S3 and finally S4. If any of the other switches are pressed the....
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As shown in the timer 555 is triggered by the positive trigger pulse, then a negative output pulses. In the absence of beating duty cycle greater than 99%. Heavy loads can be s..
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AN6071 application circuit is shown. Relationship between the output voltage and temperature is% llOmV/oC. ..
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The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacitor Cl forming the tank circuit. Adjusting Cl determines the frequency. Capacitor C2 provides....
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The whole project was developed on a friend`s request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. Mains requirements were: The very....
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Resistors Rl and R2 temperature-stabilize the NAND gates; they also ensure that the gates are in a linear region for starting. Capacitor CI is a dc block; it must have less than Vw ohm impedance at the operating frequency. The crystal runs in a....
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Circuit Power Amplifier has a power output of up to 1500W RMS power amplifier circuit is often used to power sound systems keperlun for outdor. In the final image can be seen a series of power amplifiers using 10 sets of power transistors for the ending.....
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LED flasher circuit here will flash a LED using only 1.5 volts ?supply voltage. Normally, to make any LED lamp works, you need more than 2 volts power supply..
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Another method of testing the received signal strength on a Symphony based wireless network is with a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called "RSSI Out". RSSI stands for relative signal strength....
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Transistors Ql and Q2 form the two halves of a free-running multivibrator whose frequency is determined by the voltage across C8. That capacitor is charged and discharged by closing and openingBwitch Sl. Transistors Q3 and Q4 make up a VFO. The output of....
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For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched of to avoid irritating....
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Variable audio oscillator with a range of 20 hertz to 20 kilohertz. The chip used is an Intersil 8038 waveform generator, which is a 14-pin DIP (courtesy Intersil, Inc.)....
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This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It will accommodate the usual normally-closed input devices (Magnetic Reed contacts, Micro Switches, Foil Tape and PIRs). And - with a simple modification - a....
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The ASUS Eee is a fantastic ultra-portable notebook with almost everything required for geeks (and nothing that isn t). Plus it features fantastic build q....
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This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for reseting the circuit to....
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Using only a NE: automatic light sensor circuit composed of 55 groups, so that people can rice lights, people take the lights off. } N supply route VD1, vS, C. , (1 and R. composition, power and (1, both ends of the Sichuan Hl 12V input DC ..
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These circuits provide a means of altering the YELLOW output of RED / GREEN type two colour light emitting diodes. These circuits use the LM555 timer chip...
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Receiving circuit as shown, when the infrared receiver receives the remote control signal emitted by the transmitter, after..
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The servo motor speed control circuit connects the photoelectric encoder with the motor shaft, the LED is the indicator light of the PLL detection, it turns on when the control circuit is synchronous. The PLL is the phase synchronous control method of the....
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The philosophy behind this minimalist design has been explained by Flavio Dellepiane on his highly interesting site 1. I have myself written an article about this fleapower amp from Italy in the American magazine AudioXpress 2. All relevant details are....
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The Greinacher doubler circuit (a) transforms a grounded AC voltage (peak voltage Up) into symmetrical DC voltages of 1x Up each, thus producing 2x Up between outputs. If the input voltage is already symmetrical (e.g. as in an Obit), the Greinacher circuit....
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Using an Intersil ICL8038, this function generator generates frequencies from 1 Hz to over 80 kHz. Rl is the fine freque..
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Create a robotic team mascot for my team at work. My first, humble part of that project was to create a charger for the robot`s batteries. I wanted a battery charger that could charge the various NiMH battery packs that I have, ranging from 700 mAh to 2200....
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The AM signal is captured by the antenna , 10 mt long horizontal wire, WELL insulated from earth (I mean distant, to lower the stray capacitance coupling with ground which will adsorb some signal ). The Inductor and capacitor forms a resonator, that will....
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This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. The circuit will take line level output from most....
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Operating power protection devices, there is a DC power supply operating power and AC operation into two categories. ..
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This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered. The....
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This standalone digital thermometer controls the temperature of a device according to its requirement. It also displays the temperature on four 7-segment displays in the range of 55 to +125 °C. At the heart of the circuit is the microcontroller AT89S52,....
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Digital integrated circuit is composed of ten road flashing lights string controller that drives El- El0 ten road string lights flashing cycle. The same, A2 is the - mf sequenc..
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This is my first AVR-project on this page. The DiSEqC-Tester allows to test DiSEqC-switches that uses 1. 0 or 1. 1 protocols. (DiSEqC-Switches with 2. 0 and 2. 1 protocol have backwards compatibility with 1. 0 & 1. 1 respectively and also may be tested). The....
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This temperature controller employs an LM135/235/335 temperature sensor, can be used to keep small environment warm or hot. Here is the schematic diagram:....
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A strip of LEDs from a microcontroller using PWM to control the brightness. The strip I have takes about 1. 5A at 12V. I`m only familiar with purely low power digital electronics so wanted to check if these assumptions are correct and get any advice :-....
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This circuit could be used (depending on your circumstances) by a gentleman to summon his butler, a manager his secretary or as in the author`s case to call the kids down to dinner without having to shout above the level of the CD player/TV/games console in....
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As shown in the low-cost dual output voltage regulator circuit consists of two pieces Micrel companys MIC29150-12 and MIC29150-5.0 regulator constituted. ..
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How to make a simple induction heater. This project is really simple, and surprisingly effective at heating metals using high frequency magnetic fields....
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Amplify or record a telephone call with the simple circuit shown. The 8-0 secondary winding of a miniature transistor output transformer is connected in series with either of the telephone lines. ..
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Two-phase stepper motor typical application is shown in Figure 5-15 Xin, made up of two pieces UC3717A can form a two-phase permanent magnet or hybrid stepping motor microcomputer control system...
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This voltage converter is built with TL497A and converts an input voltage of 5 12 voltage to a higher level of 15 30 volts. This is specially helpful i....
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Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and off gradually. This makes it a lot easier, for instance, to find the ignition keyhole when the lights have gone off after....
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Building your own ipod FM radio transmitter. It works quite easy, there is a power switch on the bottom to turn it on and tune your radio and transmitter to the right frequency. For the antenna you can use a copper wire of 70 cm. The range of this FM....
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Data acquisition is the process by which events in the real world are sampled and translated into machine-readable signals. Data acquisition typically involves sensors, transmitters and other instruments to collect signals, waveforms etc. to be processed and....
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If your application uses a relatively powerful microcontroller, you can use several free I/O pins or an unused input with an ADC to effect an easy keyboard connection. But, if the microcontroller in your system has too few free I/O pins and no on-chip ADC,....
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Since the circuit operates at greater than mains potential and is not isolated by a transformer, it is extremely dangerous. The DC operating potential is about 340V, and there is more than enough stored charge to kill you many times over (although in my....
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Infrared light reflected off a finger is used to activate this switch circuit. Drawing only 30uA from a 3v supply, this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED and a matching photo diode...
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This is a modification of the circuit Simple Lamp Dimmer/Fan Regulator previously posted here. The working of the circuit is same as that of the previous, but in addition a snubber circuit consisting of resistor R4 and capacitor C3 is included to improve the....
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The design of battery-powered equipment can often be
quite challenging. Since few ICs can operate directly from
the end-of-life voltage from a 2-cell battery (about 1.8V),
most systems require a DC/DC converter. The system
designer often has a limited....
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As shown in FIG touch delay switch is a CMOS NAND gate composition, can delay about 10 seconds, often used in street corridor, home door lights automatic control. ..
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This is a three-modes lamp dimmer circuit with touch control. This circuit can be used to control a lamp in 3 operation modes: dim, off, and bright. A NE555 ...
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This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz. The output voltage from the IC1 is doubled using the combination of....
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As shown in FIG grounds TDA6103Q and color picture tube composed of the actual application. R, G, B input signal from the input socket X3, through the input resistor network co..
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Dual power automatic recovery means one power supply, one power standby when the power supply off, standby power legislation that is automatically put into operation, and when ..
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Bridged resistive sensing elements is common in resistive type sensors/transducers. This sensor type need a biasing voltage to operate. LM10 provide low....
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Following a power interruption, all relays assume their previous state before the power interruption. (relay states and PIN are stored in non-volatile memory) An Motorola MC145436 DTMF decoder is used, this IC is clocked with a common 3. 58Mhz NTSC colour....
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Light Sensitive Switch is a simple project which operates a relay when the light falling on the LDR goes below a set point. ..
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There are many 9V chaser circuits that seem to waste about 7V when driving LEDs that are only about 2V. This project is unique, because it uses only two inexpensive alkaline battery cells totaling 3V for power. Since most of the waste is eliminated, the....
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The circuit consists of a 5-V regulator, constant-current source Dl, D2, and Ql, and op amp gain stage Ul. Power is provid..
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One of those smart cards that are often used for illegal viewing of encrypted video signals. It contains an Atmel AT90S8515A processor and an 8k EEPROM memory AT24C64, which gives the card adequate processing power for numerous other purposes. Other card....
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This circuit gives a 3 phase square-wave output for a variable speed motor drive. Operation is straightforward, the 4017 counter is synchronously reset after six clock inputs. The she outputs are combined to give the required waveforms. It is interesting to....
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A very simple multiway active speaker audio systems can be designed using the TDA2030 audio IC. This TDA2030 active speaker audio system circuit is designed to provide the best possible acoustic performance since each loudspeaker is specially designed and....
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A transmitting circuit, power, infrared light-emitting diode emits light receiving circuit shown in Figure, receives infrared light transistor 3DU5, the received signal output ..
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Nikon infrared remote control with some special features interval shots, multiples shots, continuous shots....
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Charging any type of chargeable battery can be critical and involves some attention to be paid. Especially the current or the rate at which the battery is being charged becomes an important factor as far as maintaining life and efficiency of the battery for....
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Here is a simple IR audio link that can be used to transmit audio signals up to 4 meters. The signal to be transmitted is applied to the base of Q1 via resistor R4. The transistor Q1 drives the IR transmitting diodes D1 and D2. The audio input will be....
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This circuit lets you keep the appliances plugged into your inverter. It won`t make the wind blow or the clouds go away, but it will keep your batteries safely charged even if you have a generation shortfall. I call it the Grid Charger Voltage Switch. The....
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This version of the Link uses DTMF tones for dialling both internally between handsets, and externally for outside calls. Remember, in some countries, it is ILLEGAL to simply connect unapproved and untested equipment to Telco lines, so avoid the fine and....
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The following alarm circuit is designed with features which maybe suited for residential and commercial alarm system applications.this residential alarm circuit also features such delay circuit, 24-hour panic circuit, built-in siren driver, alarm memory,....
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This Power Supply is suitable for the Modular Burglar Alarm. However, it has other applications. It is designed to provide an output of 12-volts, with a current of up to 1-amp. In the event of mains failure, the back-up battery takes over automatically. When....
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This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates from a 115 volt, 60 Hz source and can control up to 800 watts of power to incandescent lights. The power....
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Charge amplifier, it is a good punch hit measuring amplifier. This amplifier is actually a negative feedback capacitor having a depth of high-gain operational amplifier input o..
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The TRF1400 VHF/UHF RZ ASK remote control receiver is specifically designed for RZ ASK (return-to-zero amplitude-shift keyed) commu- nications systems operating in the 200-MHz to 450-MHz band. This device is targeted for use in automotive and home security....
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Charging of the mobile phone, cellphone battery is a big problem while traveling as power supply source is not generally accessible. If you keep your cellphone switched on continuously, its battery will go flat within five to six hours, making the cellphone....
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This oscillator circuit is designed to generate both a rectangular wave and a triangle waveform, around 1kHz to 10kHz. The first operational amplifier in the chain generates the square wave, while the second operational amplifier generates the triangle wave.....
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Here the popular 555 timing IC, is wired as a monostable. The timing period is precise and equivalent to:-
1.1 x R1 x C1
With component values shown this works out at approximately 1.1msec.The output duration is independant of the input trigger....
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The Tone generator was a simple project built as a test unit for a customer design job. We use two analog switches controlled by the microprocessor code - one switch controls the signal going to the op-amp that drives the output, the other switch actually....
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This is a project of a 555 buzzer circuit. NE555 is a timer IC comes in 8 pin dip package, it performs wide variety of tasks in electronic circuits. The circuit mentioned below will produce a buzzer sound when 9 volt power will be applied. The frequency of....
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In this article we will be discussing about a home security alarm circuit. This is a LPG gas leakage sensor circuit that detects the outflow of LPG gas and alerts the user via audio and visual indications. The heart of this simple engineering project is a....
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Here is one simple circuit of a general-purpose white LED security light with Passive Infrared (PIR) Motion sensing mechanism. At the heart of the circuit is a PIR sensor module SB0061. SB0061 is a pyroelectric sensor module which developed for human body....
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There are two composite pipe constitute ways: one is by the two transistors of the same type, as shown) as shown; the other is composed of two different types of pipe configuration,..
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Here`s a project that could be useful this summer on the beach, to stop anyone touching your things left on your beach towel while you`ve gone swimming; you might equally well use it at the office or workshop when you go back to work. In a very small space,....
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The open-loop concept of oscillator design is often met with considerable skepticism by engineers familiar with classic oscillator terminology. For comfort consider Figure 2-4A where the oscillator cascade is drawn with only the RF components. Next, the....
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The generators of square pulses, are used in a lot of applications, between which the adjustment of conditions of entry in the digital circuits and the control of amplifiers acoustic frequencies. This circuit is a generator that it produces, in combination....
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322 monostable multivibrator is cross-connected, when run under non-steady state condition between the oscillator Unicom, it will produce a continuous timing cycle, the same as..