Top Circuits Page 133
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This one of its kind and hard to find triac control AC voltage stabilizer circuit has been designed specifically just for you. Being solid state in design, the voltage switching transitions are very smooth with minimum wear and tear, resulting in efficient....
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Though it`s the world LEDs today, an ordinary flashlight bulb can also be considered a useful light emitting candidate especially because it`s much to configure than an LED. However, the moment AC mains fails, T1 is instantly forward biased, it conducts and....
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The diagram shows a rather simple voltage stabilizer design which can hold huge output power in the order of 5 to 10KVA. The use of SSR or solid state relays makes the output stage easy to configure and very accurate - thanks to the modern SSRs which are....
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This design can be used for charging high current lead acid batteries in the order of 100 to 200 AH, the design is perfectly automatic and switches of the power to the battery and also itself, once the battery gets fully charged. A filter capacitor after the....
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In this power stabilizer circuit, one relay is wired to select the high or the low tap from the stabilizer transformer at some particular voltage level; whereas the second relay keeps the normal mains voltage switched in, but the moment there`s a voltage....
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Controlling your door lock through your personal cell phone was never this easy. Learn how to build a simple electronic circuit that will help in converting your ordinary door lock into a high security door lock which can be now controlled through your own....
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Capacitors are one of the major electronic components which come under the passive component family. These are extensively used in lectronic circuits and virtually no circuit can be built without involving these important parts. The basic function of a....
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The circuitdescribed herecan be built and used in your vehicle for an automatic dipping and dimming operation of the headlamps, in response to the intense lights coming from an opposite vehicle headlamps. You must have come across this irritating situation....
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The ignition process in any vehicle becomes the heart of the entire system as without this stage the vehicle just won`t start. To initiate the process, earlier we use to have the circuit breaker unit for the required actions. Nowadays a more efficient and....
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A very simple piezo electric buzzer using hardly any electronic components. Just a single transistor, a coil, a piezo buzzer are enough to make it buzz or rather twit for you, with an output that may be quite ear piercing. The simple buzzer circuit....
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The 4049 section is the basic voltage doubler circuit which effectively boosts the 9 V supply to a level of around 15 V which further becomes the supply voltage for the next 555 pulse modulator section. The main feature of this infrared IR LED flood light....
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The shown LEDs in the circuit sequentially light and "dance" as per the level of the music applied at the input, preferable directly from the speaker terminals of the audio gadgetwhosemusic level is to be monitored. The above stage is identical to all the....
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Using white LEDs for illuminating our homes is becoming popularnowadays, due to the high power efficiency involved with these devices. The diagram shows a straightforward configuration involving many LEDs, arranged in series and parallel. Refrring to the....
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The astable multivibrator mode is the most fundamental mode of operation of the IC 555. In this mode it basically functions like a free running oscillator. If this oscillator rate is reduced sufficiently, can be used for driving LED lights. The wiring at the....
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Here we explain a couple RF 433kHz remote control chips especially designed for the purpose. The IC TWS-434 along with its encoder chip HOLTEK`s HT-12E form ahigh class transmitter circuit, whereas the chip RWS-434 through its complementing decoder IC HT-12D....
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This simple home emergency lights uses very few components yet is able to produce a reasonable amount of light. The components used are very common and can be easily procured from the local electronic retailer. This oscillations forces an AC in the secondary....
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The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
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The circuit shown below can be used for measuring frequency or Hz. The IC is very simple to make andutilizesjust a single IC 4033 and a common cathode display as the mainingredients. If higher frequencies in the the order of two or threedigitsare required to....
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The power supply used here is a capacitive type, thus no transformer is incorporated making the circuit very compact and fixable in any small corner of the particular premise. The use of LEDs in place of a filament bulb makes the application very....
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A very simple battery charger circuit is described in this article, which uses just a single transistor for the voltage detection as well as for automatically disconnecting the battery from the supply when it gets fully charged. This adjustment becomes the....
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A very simple frequency counter circuit is shown below and can be easily built by any electronic enthusisat for the intended purpose. The circuitdiagramwas provided by Mr. Kapital through an order in Fiverr. com, I was asked to explain the functioning by....
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The proposed remote control circuit idea can be used for controlling any electrical gadget within a range of 100 meters. Since the idea here is to modify an existing circuit of a remote bell unit, becomes super easy without any complications. However the....
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In electronics, filter circuits are basically employed for restricting the passage of a certain frequency range while allowing some other band offrequencyinto the further stages of the circuit. A high pass filter circuit will allow only the frequencies which....
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VU meter or a volume unit meter is a device used for indicating the music volume output from an amplifier or a loudspeaker system. It may be also considered as a device for displaying the PMPO of the amplifier at a particular volume setting. Though the unit....
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Whether it`s truckthrottling over the highway, or an airplane roaring about the sky, or whether it`s a knock on the door or a purring of the cat or simply your heartbeats, the vibration level detector circuit explained here will sense them all and convert....
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In electronics H-bridge circuit refers to a configuration consisting of four individual switching devices like transistors or mosfets, such that these can be switched through external discrete signals from respective stages of the involved control circuit.....
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The article shows a circuit idea which incorporates an innovative way of detecting the minutest of shocks caused by a possible earthquake tremor. The circuit is so sensitive that it is able to detect tremor of 4 on the Richter scale, yet remains unaffected....
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The IC LM338 by TEXAS INSTRUMENTS, is a versatile IC which can be wired in numerous different ways for obtaining high quality power supply circuit configuartions. The first circuit shows the typical wiring format done around the IC. The circuit provides an....
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As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....
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This is probably the simplest radio that one could ever imagine of making. The circuit is so simple that it could be finished assembling within a few minutes and you are already listening your favorite programs over it. The circuit of a single transistor....
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A Fence charger or energizer is an equipment which is used for charging(electrifying) a fence or a boundary in order to protect the inside premise from human or animal interventions. Since these boundaries are mostly of large fields and parks, are normally....
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The circuit diagram shown below explains it all, no need of any complicated circuitry, just connect a 0-1 V FSD moving coil meter across the relevant pins of the IC, set the pot appropriately, and you are ready with your room temperature sensor circuit...
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Without the specified delay the circuit could malfunction or even get damaged. A capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see thatit`s been placed at the other end of the base resistor and not....
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Just connect 22k fixed resistors across each transistor base and ground and then you may connect the 50K Dual pot leads across these resistors, that should imitate a 10k pot variations quite closely. Hi Swagatam, so just to be clear, you want me to remove....
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Using a transistor won`t give accurate results, moreover the setting part would become very tedious. The circuit is technically correct, if you can adjust the tripping point correctly, then it might just work. Vinod: I made the charger (hysteresis) but there....
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The following mains operated LED flasher circuit which is actually an astable multivibrator circuit utilizes only a diac and resistor arrangement for implementing interesting wig wag flashing of two LEDs. The circuit was shared with me by Mr. Vineesh, who is....
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The post explains a simple delay ON circuit which allows the connected load at the output to be switched ON with some predetermined delay after power switch ON. The explained circuit can be used for all applications which calls for an initial delay ON....
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The post discuses how to modify an ordinary square wave inverter using IC 4047 into a modified sine wave inverter through PWM technology. The idea was requested by Mr. Philip I am a Nigerian living in Nigeria and I have been an avid follower of your blog and....
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If there is no light falling on the diode it will exert a high impedance(resistance). if light falls on the diode resistance of the diode willdecreased. (almost short circuit) in case of a black body or space(no objectin front of sensor) thenno light falls....
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If you want to make your robot sense the objects in it`s surroundings i suggest you to go for an ULTRASONIC sensor. Though the IR based sensors are cheep, their working range may vary due change in ambient light and won`t give accurate range values. In case....
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The output of this circuit should be fed into a high-impedance load, say >100K, remembering that the impedance of C4 is around 3K. A PNP transistor can also be used, with the necessary changes to the supply voltage. An op-amp can also be used, connected as....
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This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order to enjoy the renewed interest in AM operation on 2m in the UK. For several years I`d worked local....
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found out the hard way why the 6v EQ-5 hand controller should not be connected to 12v by accident. It only took, literally half a second to kill my hand controller. After some examination it became obvious that I had destroyed the large 40 pin micro....
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This 80M receiver design includes the necessary switching to allow the SSB filter and first I. F. amplifier to be used for transmitting. The receiver stages from R. F. input to speaker output will be described in detail below. This type of band pass filter....
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The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early....
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This is a circuit to test zener diodes. It hooks up to a 120V AC line and boosts the output ....
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When the circuit is first powered up, neither transistor will be switched on. However, this means that at this stage they will both have high base voltages and therefore a tendency to switch on, and inevitable slight asymmetries will mean that one of the....
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This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CM IC`s and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a system armed ....
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Circuit shows the operation of an ultrasonic motion detector. There are two transducers, one emits an ultrasonic wave and the other picks up reflections from the different objects in the area. The reflected waves arrive at the receiver in constant phase if....
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Desulfation is the process of reversing the process of sulfation that occurs to a lead-acid battery over time. Desulfation restores, at least partially, the ability of the battery to hold a charge over the life of the battery originally caused by sulfation)....
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The circuit is designed to be fitted into a small box and then fitted into your backbox (the exact choice of position is yours). Only 3 wires are required one for the battery +v, one for the supply +5 volts from the MPU board or power supply and a common....
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With simplicity being the goal, brain-wave goggles can be constructed from suitable eyewear, such as safety glasses, and an array of LED`s (Light Emitting Diodes). I`m using the PC`s parallel port to control the flashrate of the LED`s. Audio stimulation can....
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This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the....
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