Popular Circuits Page 258
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Expensive stereo is general often have VU meter come to and for help show max power the stereo not too much. For radio tape general plaything has will no VU Meter. I then think to seek Multi meter use can replace. By use Range 100uA and electronics equipment....
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A very long time constant is provided by R1 and C1. C1 discharges and the near zero voltage at its positive lead is applied to the high impedance inputs of the....
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A commercial motor controller is more than simply a circuit to alter the speed of the motor and we have a `guided tour` of controller features which explains simply most of the features incorporated into modern controllers and why they are needed. To control....
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When starting with Arduino, one soon has much more Arduino boards then RS232 or even USB ports on the computer. So that, it seems more useful to put the signal level converter to an external adapter than directly on the Arduino board. Usually, one has (I....
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This web page describes how to install and use my ezlog data logging software. This software allows you to measure when different events happened, allowing you to synchronise the timing of different stimuli. Specifically, my software is designed to get a....
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It is very interesting and convenient to be able to control everything while sitting at your PC terminal. Here, a simple hardware circuit and software is used to interface a 7-segment based rolling display. The printer port of a PC provides a set of points....
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This be simple check pressure level circuit, with integrated number circuit TL431. When use power supply 5Volt in digital circuit. The general feeding signal....
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With the proliferation of dual-voltage architectures and multiprocessor boards, even simple applications can require several processor voltage rails. With each processor having its own power-up and -down requirements, power-rail sequencing and control can....
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This circuit, a modification of a function-generator circuit, comprises a battery-powered sinewave generator that is continuously adjustable from 100 Hz to 10 kHz..
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This sawtooth generator circuit use 741 IC and is used as a musical sound synthesizer. The sawtooth input signal is continously changed through P2 to a wav....
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This is the most popular IR Remote control circuit for home appliances like lamp, fan, radio, tv etc to make the appliance turn on/off from a TV, VCD or DVD remote control. It is very simple to build because of few components and simple design. The circuit....
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This circuit explain about alternate wireless switching using ultrasonic sensor. The distance of switching range should be more than 10 meters ....
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If you have a motley collection of 12V batteries in varying states of health, this simple circuit will allow you to easily check their capacity. It s basi....
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Here`s a circuit diagram (originally drawn by Wilf Rigter, I corrected it based on Bob`s on-list feedback) for Bob`s "Vore-N-More" circuit containing the SmartCap solar engine:
In this diagram, the "SmartCap" is just the 1.5 F storage capacitor,....
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3-119 circuit shown in FIG. By combining switch SA, realize stator windings, 2, Y and 2Y connection corresponding to the motor speed n1..
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20V child fS/iff power over a foreign vine wine Kiiit, bulb and plug Mount the bridge rectifier circuit. Poke seat access lamp LL n © number ur using 10- IOOW front with a smal..
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In conventional white LED design, the Max1916 low-dropout bias supply for white LEDs is a high performance alternative to the simple ballast resistors. A....
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By vocalizing the numbers and symbols of its~eypad, the phone provides an audible confirmation that is useful to the blind. The serial-interface, 2 K-byte x 8-bit ROM (!C4) stores programmed sequences of instructions that are executed by the....
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The aim of this project is to create a setup to capture the image of a falling object or any object in motion at a precise time using a DSLR and Arduino microcontroller. It can be done in many different ways, but the method I tried is illustrated below.....
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For the purpose of this project, digital signals can be communicated with computers while analog signals can`t. RS232 is the name given to your serial port. At the back of your computer, there`s many ports where you can plug things into. The RS232 port has 9....
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Normally the active high output from the inverter is used to enable the remainder of the CMOS gates which then perform some useful function. When the SIMD1 triggers at night, it snaps on and the output signal can be used to control the 5 remaining 74HC14....
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As shown by INA326/327 constitute a single power PID (proportional - integral - derivative) as shown in the temperature control loop. The circuit is mainly to complete work on ..
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By connecting this circuit to a logic device that"s under power, you can get an indication as to its status. If the circuit is ..
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Many low pass filter circuits for subwoofer are given here and this is just another one. The circuit given here is based on the opamp TL062 from ST Micro electronics. TL062 is a dual high input impedance J-FET opamp which has very low power consumption and....
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Complete terminal unit and AFSK tone generator for VHF bands synthesizes tones digitally for 170-Hz narrow shift and 850-Hz standard shift found in VHF amateur RTTY bands. Additional feature is PLL circuit that follows drifting signal and copies signals from....
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In the circuit the frequency trimming component is arranged so that the voltage across it is in quadrature with the voltage V0 from the bridge so that as it is adjusted the attenuation of the bridge only changes a little, avoiding the need for a two gang....
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The circuit is temperature to pulse width converter. The LM3524 to convert the output of an LM135 temperature transducer into a pulse width which can be measured by a digital system, such as a microprocessor controlled data acquisition system. In this....
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When the digital logic level at the control input is low, the PIN diode is forward-biased by the CMOS gates. The two 1-KO bias resistors limit this current to the PIN diode"s safe forward current limit. In this state, the switch is on. When the control....
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The design is based around a pair of 433MHz wireless modules. These can be bought pre-built and contain all of the radio frequency components that we need. We use these modules in our two circuits; one to transmit our vario audio and the other to receive and....
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This jet engine sound generator circuit is based on the sound generator IC HT2844P from Holtek Semiconductors. This particular IC can make four sounds namely low speed sound of jet engine, high speed sound of jet engine, missile sound and machine gun sound.....
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The recent availability of a broad line of truly high-performance consumer integrated circuits makes it possible to construct a high quality, low noise, low distort....
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In order to remove circulating current of zero-voltage switch three-level DC converter in zero state, we come up with kind of zero-voltage zero-current switch three-level DC converter circuit. The circuit is shown in the following diagram 1, the main....
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Building ESLs involves the use of tools and materials that if handled improperly can be hazardous. Please make sure you know how to use these things before you begin. By all means, use safety glasses at all times. If would be foolish to trade your vision for....
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555 ultrasonic constructed transmitter circuit 3 feet from the oscillating pulse output of 555 T-40-16 40kHz drive to work, so that emit ultrasonic signals of 40kHz. Circuit vo..
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The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted. Q2 is....
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Parts List The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system ..
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Battery Eliminators are the circuits, which creating DC power supply from AC Mains. Basically battery eliminator circuits are the compination of step down transformer, rectifier and voltage regulator. Here is a simple circuit of a Multipurpose Battery....
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This antenna might help to reduce power-line noise. A plastic hula hoop or conduit 3 feet in diameter, covered with aluminum foil as a shield is used for LI and L2. LI is two turns and L2 is one turn, threaded through the loop. SI selects 160- or 80-m....
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Here is one basic circuit of a simple but accurate 1Hz timebase generator built around a standard Quartz clock circuit board. Just lift the clock PCB from....
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Quartz crystals have the property that their amplitude/phase characteristic repeats itself at frequencies that are an uneven multiple of the fundamental frequency. There are so-called overtone crystals that are cut in such a manner that they possess this....
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32kHz clock oscillator transistor Tun digital path, the clock circuit is indispensable, as shown in FIG. 32 kHz crystal clock oscillator is ..
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As found in SLAA458, the revised pulseoximeter application, I`ve attached an image of the USB schematic that is used to output collected data. I just had a few questions about this schematic. 1) What do J3 and J6 correspond to I can see the corresponding....
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You use high-side current monitoring in many battery-powered products that require accurate monitoring of load current, charger current, or both. In applications for nonportable designs, high-side-current monitoring serves as a power-supply watchdog that can....
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A photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is used in the differential mode to amplify the pulses of current from the photodiode. LED1 is an ordinary coloured led which will light when IR radiation is being received. The output of....
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This simple audio power amplifier was originally designed for a circuit board workshop, conducted by the OSU IEEE Student Group. At the workshop, 20 participants each constructed this amplifier, by etching and drilling the single sided circuit board,....
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A small neon lamp is triggered into conduction by the telephone's ringing voltage, passes just enough current to activate the LED in optocoupler Ul, which in turn triggers the 6-A Triac that controls 12—a 117-Vac lamp or bell. (Capacitor Cl is necessary....
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If you re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whethe....
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This transmitter consists of three stages. The step of the oscillator with the 6L6 lamp, the amplifier isolator with the lamp 807 and the final stage of the transmitter with the 811 lamp. The coil L1 is requested by the market as a coil of the 6SA7. The....
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The heart of the circuit is the tone (pitch) display section, based on the popular LM3914 display driver. This device drives ten LEDs in a linear display, with programmable endpoints and the choice of "dot" or "bar" modes of operation. Furthermore, it is....
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Fading a video signal can`t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a ...
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The principle of operation of the proposed metal detector circuit is quite basic yet very interesting. The detecting function is triggered by sensing the decrease in the Q level of the LC network associated with the circuit in the presence of a metal at a....
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Here we show you how to hack a TV-B-Gone into the case of a vintage television remote control, such that the original on/off button instead activates the TV-B-Gone. We also modify the power supply so that it runs off of a regular 9 V battery, instead of a....
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ICL8038 based audio oscillator circuit. Simultaneous sine, triangle and square wave forms. Dual supply operation. Cover full audio frequency range....
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Before examining the various analog to d igital (A-D) and digital to analog (D-A) conversion processes it is useful to review the properties of each type of representation; in particular this may help select the representation most suited to the problem at....
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Using LM134 and LM10 integrated circuits, we can build a thermometer which has -55 to 150?C sensing range.? The ideal meter for this circuit is a 0-200uA...
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This is a circuit diagram fuse monitor circuit indicators. This very simple circuit uses only two components, but only with a single resistor and LED this circuit provides visual indication when the fuse has blown. LED1 is usually dead, a short circuit by....
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I am about to post a How To on testing DDL`s circuit before adding the LD, I hope it is all pretty clear and with no errors. Those ....
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This package contains the schematic for an FM transmitter with 3 to 3.5 W output power, and can be used between 90 and 110 Mhz. Although the stability Although the stability isn't so bad, a PLL can be used on this circuit. This is a circuit that I've build....
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Although you may well be the proud owner of the very latest NiCd battery charger, you may still come across the odd `incompatible` battery, for example, one having a rare voltage or requiring a much higher charging current than can be supplied by your....
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To keep the gain constant, the circuit used an incandescent pilot light to provide AGC (automatic gain control). As is true for all incandescent bulbs, the pilot light has nonlinear resistance. When you turn on the circuit, the cold lamp`s resistance is low,....
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The controller box is the MegaSquirt EFI Hardware. The MegaSpark was originally designed & tested on v2. 2, but may work on other versions. The software was designed to yield a fully functioning advance controller with no modifications to the MegaSquirt....
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The receiver is a basic SA612 circuit. (U5 and U6) The LO for 20 meters is about 9 MHz and an IF of 5.068 MHz. The IF filter uses two crystals and has a peak response at about 5.070 MHz, so this matches up well with the 20 M PSK sub-band centered at about....
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This is a simple 2N2222 transistor based radio FM transmitter circuit within the FCC (Federal Communications Commission) limit, that is no license is necessary for using thisstable FM transmitter circuit. What is an FM transmitter FM stands for Frequency....
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This is a circuit where an alarm will go off once the circuit is tilted. Once the circuit is tilted beyond a certain degree, a loud buzzer will go off, alerting us to this. Many different types of electronics have tip-over protection circuits. One such....
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Very simple, versatile modular design. The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating....
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As of control rechargeable delay circuit Under normal circumstances, when there is no input signal, the transistor VTi off. VTz conduction, the output U. Low potential. When U...
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Power input is to a 7805 5 volt regulator. A pair of LEDs is connected between the 5 volt supply and ground, with current limiting resistors in series and one pin on the AT90S2313 shunts the current through one LED or the other. When one LED is on, the....
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The simplicity of a traditional die makes it exceptionally difficult to create a fully equivalent electronic version, if only because an electronic version requires a power supply and a collection of electronic components that occupy a much larger volume....
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This is a spectacular but completely useless project. It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly. The LEDs light-up going around and around since they are mounted in a circle (on a CD), then they pause before chasing....
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Circuit characteristics: O simple phase shift range 180. ; good linearity, control accuracy than the first two, and is suitable for low voltage, but less demanding electroplati..
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The ADC Tester (A2100) is a LWDAQ device that records the output and power consumption of two ADC s. Its original purpose was comparative testing of two ADCs at different temperatures, but it turned out that the A2100 makes a good dual-channel eighteen-bit....
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In this article, I`ll be showing you how to make a simple yet effective static electricity generator. Basically, this device allows you to carry a constant static charge on your body and discharge it on anything grounded or of opposite polarity. The....
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The supply of circuit becomes from a AC line in the J1. This voltage can be from a separate transformer 2X12V (the prices of materials that I give it is for 2X12V AC), from existing coil 12V in their M/T of power amplifier or if it cannot become somebody....
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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....
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MC1411 series of Darlington Drive current internal structure Darlington current drive has a small, consistent, and high reliability parameters, especially for high-voltage, high voltage peripheral driver stream, can directly drive relays, lights and other..
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This audio mixer circuit schematic we propose here is built around four amplifiers, which are current controlled, all of them incorporated in IC SSM2024, p....
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Broadband using negative feedback amplifier circuit Shown as a negative feedback mode broadband amplifier circuit, the amplifier circuit are used transformer coupling, amplifyi..
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This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the....
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This battery chargercircuitis regulated and adjustable to make this circuit able to charge the mosto NiCAD battery. This circuit will work for single cell or multi battery cell which connected with series/parallel connection. The maximum voltage of the....
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Consumer appliances these days hardly ever have a proper mains switch. Instead, appliances are turned on and off at the touch of a button on the remote control, just like any other function. This circuit shows how a device (as long as it does not draw too....
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The LM35 series are precision integrated-circuit temperature sensor, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensorscalibrated in ° Kelvin, as the user is....
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Powered by LM2700 IC, this charger can help you to re-charge your mp3 player, camera, cell phone, and any other gadget you can plug into a USB port with faster rate....
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I have no idea whether the RCA 40468A FET is still available or not. It came in a 4 pin metal can - with the 4th pin connected to the substrate. I have successfully substituted other N-channel devices, such as the HEP-802 - which comes in a plastic TO-92....
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current....
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R4 prevent the output voltage drifting towards one of the supply rails to the op amp I understand that R4 has to have a high resistance but I do not know why That looks like a Circuit Lab schematic! It would be great if you could post a link to the schematic....
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Common telecoil is MM formula (magnetic-acting), about 600 in order to take the received signal, should reduce the impedance in the high segment, in parallel with 150pF input p..
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Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is....
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For multiplying frequencies in the 1-to 150-Hz range, this circuit uses a 4046B and a 100 prescaler. The VCO output..
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Circuit Making Home Theater 5.1 Surround amplifier schematics Circuit Electronics, Actually, 5.1 channel amplifier consists of 6 amplifiers 1 channel mono, which has certain specifications on each canals. Has 6 channel surround sound ampli....