Popular Circuits Page 174
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This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
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This project uses a four-point resistance measurement process also known as the Kelvin method. This procedure uses a current source to determine the value of an unidentified resistance. A constant current flows through the unknown resistance and the voltage....
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A circuit of measurement of level based on a typical application of National. The circuit round the IC1 makes input adaptation and amplification with the trimmer TR1 [GAIN]. The circuit round the IC2 makes half-wave rectification of acoustic signal. With....
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Simple AC to DC converter 9VAC to 35VDC This again idea example ac to dc converter model to be simple. By modify 9VAC to 35VDC from when how many is see...
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Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you ve come home to find your aquarium fish trying....
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Converting into voltage is undesirable for two reasons: first, an impedance is inserted into the measuring line causing an error; second, amplifier offset voltage is also amplified with a subsequent loss of accuracy. The use of a current to voltage....
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The purpose was to create an octave and have the ability to play it when a crocodile paddle was pressed. I made this device because I like music and I thought the ability to control the sound with your feet would be cool. This project is to preform the....
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Design cicuit using a power mosfet to replace the NTC (thermister) that many Mag623 users employ to prevent their bulbs from flashing. Although inexpensive and easy to hook up, NTC`s run quite hot. They are also affected by ambient temperature, require a....
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The sphygmomanometer can roughly be divided into two kinds at present: First, mercury sphygmomanometer, steady for number value advantage its, shortcoming its operate by oneself for unable one, must be professional the medical personnel operates, and the....
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On several occasions, Acorn`s initial specifications for a new machine and the final product have differed considerably in the features they provide. For example, the Risc PC`s motherboard SCSI controller and Phoebe`s ultra-fast scratch memory were consigned....
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Requiring no rectifier diodes, the positive peak-detector circuits in figures 1 and 2 exploit the open-drain output of a Texas Instruments TLC372 fast comparator, IC1. Both versions of the detector are simple and inexpensive and provide a buffered,....
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R2_47R 1/4W Resistor D1_LED (Any dimension, shape and color) Q1_Infra-red Photo Transistor (Any cheap type) Q2_BC327 45V 800mA PNP Transistor SW1_SPST Toggle or Slide Switch (Optional, see Note) B1_3V Battery (2 x 1. 5V AA, AAA or smaller type Cells in....
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This is a low cost FM booster circuit to receive far away fm stations clearly on your radio in your local area. The circuit diagram of FM booster consist of a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. The output of the....
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Hello, I am new to electronics. It has recently become a hobby. I have built a few guitar pedals and small amps. My project I`m working on now is an....
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A Darlington would perform even better, but the circuit would be slightly more complicated. (See the schematic at bottom-right. ) Fortunately, the added complexity is inside the part! The reason for the Darlington`s superiority is that it can provide the....
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This very high quality audio amp is based on the TDA1514A, a 9-pin flat package IC. The heatsink must be insulated from ground. The amplifier will deliver 40 watt into an 8ohm load with a 27.5 volt power rail or 40 watt into 4ohm load with a 21 volt power....
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The principle is that there is a certain parasite capacitance between coil windings, which stores a certain amount of energy. By winding the coil bifilar, you get substantial bigger voltage differences between adjacent windings and therefore more energy is....
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This documentation was compiled as a result of a bee hive temperature monitoring project. Multiple DS18B20 temperature sensors were used to sense the temperature at various locations in the hive. An Arduino with a Nuelectronics sensor shield was used to log....
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This is a buffer circuit for TMP01 Temperature Sensor. The output of this sensor is a low impedance dc output voltage with a 5 mV/K temperature coefficient....
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The Zen (single-ended MOSFET) amplifier was published by Nelson Pass in The Audio Amateur 1. In a subsequent issue of this magazine, Nelson slightly improved the original design 2. I decided to build the "Revisited" version with the following circuit....
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Crime in general is still on the rise, and having a security alarm installed is no longer a perquisite of the wealthy! Here is a simple and compact securit....
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This circuit will let you know when something that should be kept closed - has in fact been left open. Attach it to a Fire-Door. It will allow you to pass through the door as usual. However, if it`s left open for more than 30-seconds or so - the buzzer will....
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Two-phase servo motor has the field winding and control winding, when the phase difference is 90°, it generates the rotation torque. The potentiometer connected to the motor shaft will get the voltage difference between the corresponding voltage and target....
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CD4538 is a dual Monostable Multivibrator. When you trigger the chip the output sends off one single pulse or one high-low event. The T+ pin 4 of U1a is the positive edge trigger or raising edge trigger input, the T- pin 5 is falling edge or negative edge....
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7W Mono Audio Amplifier Kit - This small amplifier is constructed around the TDA2003 IC, capable of delivering 7 watts music power into 4 ohms....
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Since the ultrasonic receiver used in this circuit is one designed to vibrate optimally at about 40 kHz, the transmitter paired with this receiver must also transmit 40 kHz waves. When these waves hit the receiver, the receiver vibrates and produces electric....
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As shown mainly by the touch-delay switch one pair of D flip-flop CD4013 composed, it can be used in some machines power switch, delay switch is also used as lighting, it also ..
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Charges and protects your mobile phone from voltage spikes and short-circuit Most mobile chargers do not have current/voltage regulation or short-circuit....
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A digital clock is one that displays time in digital format. The circuit described here shows the time with double-digit "minutes" and two digits `seconds` in four seven segment displays. The segment of seven switches are interconnected with 8051....
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Designing a power supply that meets the demands of Power over Ethernet (PoE) and Voice over Internet Protocol (VoIP) applications can be challenging. The low component-count power supply depicted in the figure meets these specifications without the need for....
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In binary phase shift keying (BPSK) modulation scheme, the phase of a carrier is changed in accordance with the digital pulse signals. BPSK modulator is basically a phase modulator. Here the transmitted signal is a sinusoid of fixed amplitude. It has one....
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The following circuit shows about LEGO Light Sensor Circuit Diagram. This circuit based on the LM358IC. Features: dual opamp,high speed double ....
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The op amp is wired as a 2 noninverting dc amplifier with a gain that is determined by the R3/R2 ratio. The inp..
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The applications described in this document are applications for driving high power LED diodes. The described circuits can be applied on other applications with similar circumstances as well, in case they fall within the specifications of the MLX10803. This....
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Motor starters generally fall into two categories: full-voltage or reduced-voltage. The choice of which type of starter to use depends on various factors, such as current-carrying capacity of plant wiring, ability of plant power supplies to absorb power....
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Circuit works The harvester warehouse full of reminders by the photodetector amplifier circuit and sound and light alarm circuit, as shown in Figure 1. Circuit, the photodetect..
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Build a Knight Rider LED display on breadboard controller by an Arduino. An easy circuit for beginners in electronics using an Arduino Uno....
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FET relay circuit 2 It is actually a JS-20 time relay circuit. SA before the switch is closed, the relay device KA tends to release state. After SA closed circuit delay start, ..
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This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An....
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Currently working on an insect robot project. my first robotics project! I`m looking into 2 methods of detecting obstacles i. e. IR and Ultrasound. I cannot seem to choose at this point in time! Can someone give me some guidelines as to which is more....
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As shown in FIG TDA6106Q test circuit with feedback factor is 1/116. After the input signal Vin from the input network R1, C1, C2, R9 enter TDA6106Q composed of 3 feet, 3 feet ..
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When I started out making pickups, I had just bought a bigger lathe and had one of those mini one that I was just going to sell. I instead turned it into a wi....
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This 1. 3V power supply can be used as replacement for the 1. 3V Mercury Cell in any circuit. When the input 5V is given to the circuit, the voltage drop across zener diode D1 will be around 2V. The diode D2 will drop a 0. 7 V from the 2V volt and the....
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This is a fairly simple schematic of the amplifier and filter. At the core of the circuit is an LM124 op-amp running in an inverting configuration. Th....
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As shown in FIG grounds MAX4223 ~ MAX4228 uses a capacitive load drive circuit isolation resistor RISO constructed. MAX4223 ~ MAX4228 maximum permitted capacitive load of 25pF ..
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A simple NiCd charger can be built using junk box` components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a fully charged` voltage determined by the....
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Here's a metal detector circuit that frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce an audible heterodyne. On the surface of it, this design would seem to represent little more than a twinned BFO metal detector...
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Normal operation of the light switch gives gentle illumination (LA1). For more light, simply turn the switch off and then immediately (within 1 s) on again. The circuit returns to the gentle light set-ting when switched off for more than 3 s. There is no....
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The ISL6528 provides the power control and protection for two output voltages in high-performance graphics cards and other embedded processor applications. The dual-output controller drives an N-Channel MOSFET in a standard buck topology and a NPN pass....
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The circuit presented here uses linear shunt regulation. Simply spoken, it burns off all excess energy from the panel, keeping output voltage constant. At times when the solar panel output is equal or greater than the load, and the battery is fully charged,....
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Even if simple the circuit, plirej` all condition, regarding the distortion and the response of frequency. The resistance of entry is 250K and the load that can drive is between 100R and 2K....
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Can be interfaced to other adapters Keypad adapter (Optional) or RF receiver (Optional) or Via the Net (Optional) Can be adapted to operate other external attachmen....
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc. But if you need simple and chep for RS 232 converter, i though this circuit will be usefull for....
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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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This is a very excellent 40W power amplifier design using TDA2030 IC and two transistors. The circuit employs only few components and does not require a dual power supply. The input signal is coupled to the non inverting input of TDA2030 through the DC....
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This example shows how to use SPI communications to read data from a SCP1000 Barometric Pressure sensor, and how to then post that data to the web by using your Arduino/Ethernet Shield combo as a simple web server. Using the Ethernet library, your device....
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Fans in PCs can be objectionably loud. In many cases, the amount of noise produced by the fan can be considerably reduced by lowering its speed. Although this will decrease the amount of cooling, this need not be a problem as long as you don`t go overboard....
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Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 100 mA of continuous current at 5V to the peripherals that are connected to the bus. So a USB port can be used, without....
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The pull-up transistor of the totem-pole output is used-to turn on the LED and the pull-down transistor is used to turn ·off the LED. The lower impedance and higher current handling capability of the saturated pull-down transistor is used as an effective....
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Circle S2 is stable automatic light switch, when S2 is open, the entire circuit is Subsection II SCR stepless presentation dimmer, simply omit the high-frequency filter circuit..
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full sine wave ups information, in English, with a detailed C language source code, English may be the weak to be careful of, a little..
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A microcontroller is a single-chip computer. It has internal RAM, ROM, timers, counters, interrupt circuitry, I/O ports, analog comparators, serial USARTs, analog to digital converters, watchdog timers, and a RISC architecture. When you are using a....
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As shown in FIG constitute grounds PGA103 programmable gain instrumentation amplifier. This circuit uses the PGA205 and PGA103 cascading manner, the total gain of the amplifier..
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I`ll eventually post an explanation, but in the meantime, here it is. Meanwhile, a slightly refined version (with flashing LEDs to indicate "lock") was posted a few weeks later:..
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In applications where the period of the input pulses is uneven and the divider is required to cover a wide range of frequencies, the non-integer programmable pulse divider shown can be used. The purpose of the D-type flip-flop (IC2) is to synchronize the....
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The under/over voltage protection circuit with time delay presented here is a low cost and reliable circuit for protecting such equipments from damages....
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This is powerful siren circuit diagram. You can get lots of supports from this circuit because you can use this circuit for your alarm circuit then you will be able to get maximum results...
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Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light b..
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Values shown are for 13-kHz bandwidth 1070 Hz for mark and 1270 Hz for space, using Exar XR-2206 function generator and XR-2211 FSK de-modulator Report gives design procedure Supply can be ‹12 v "Phase-Locked Loop Data Book, "Exar Integrated Systems,....
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FM tracer was prepared using the LM3909 IC and some supporting components. 1. 5V FM trackers This will provide an indicator of revenue sources by providing a signal emitted by the LED. FM tracking uses a source voltage of the battery cell and fruit....
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THis Wien bridge oscillator is very simple and as every wien oscillator has low distorsion and the resonance frequency can be easily adjusted. This frequen....
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This strobe gives a visual indication of a sensor input. The input signal causes Ul, a light dependent resistor, to chaijge CI..
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SW1 bypasses the crossfeed network. I have reconfigured the original crossfeed schematic so that now the 100k resistor always bridges the bypass switch and thereby reduces any 'crackle' or 'click' or whatever you may call them. Don't omit these 100K....
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This is adjustable elctronic fuse that can be used to protect power supplies from short circuits or can be also used to limit the current usage. It can be adjusted for currents from 100mA up to 4.3A...
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Almost UGN3113U use open collector Hall IC switch for position sensors. The current limiting circuit has a crystal Camp V, and take R, l. Skfl, R, 300CZ, rR lying a 5V, R. 0.15..
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Free-space optical (FSO) communication uses light as a medium to transmit data. We did communication between two computers using laser(without help of any existing means of communication). We sent texts from one PC to other(Laser Chat Messenger) just like....
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Circuit offers passband gain 1,10kHz corner frequency for eliminating high frequency noise such as hiss, ticking, popping sound. ..
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Analog to Digital converter modules are used in Micro controller based projects where the analog signals are required to be converted into digital signal for further processing in Micro controller. The integrated chip used for this purpose is 0809 ADC. This....
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All PIC IR Decoders share the same, easy to build, hardware. All parts for this hardware are easily obtainable throughout the world. Building it shouldn`t take very much longer than one evening. At the heart of the diagram is the PIC16F84 processor. It is....
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A 3-x -3-inch piece of circuit board, or similar size metal object which functions as the pick-up sensor, is connected to the gate of Ql. A 100-MD resistor, R2, isolates Ql"s gate from Rl, allowing the input iropedance to remain very high. If a 100MO....
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Even though today s electrical appliances are increasingly often self-powered, especially the portable ones you carry around when camping or holidaying in summer, you do still sometimes need a source of 230 V AC - and while we re about it, why not at a....
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National Instruments Multisim now has microcontroller unit co-simulation capabilities, allowing you to include a microcontroller, programmed in assembly or C code, within your SPICE modeled circuit. The MCU functionality in Multisim enables students,....
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In this circuit, phototransistor and four operational amplifier take the action of total energy detector, to detect the total energy of pulse optical transported by the optical cable communication system. If the light intensity of singal source remains the....
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Using an EXAR XR2206, this generator will produce sine, square, and triangular waves from Hz to 100 kHz. U1 is the XR2206 chip, R7 controls frequency, and 55 through 58 select the frequency range. U3 produces a TTL-compatible square-wave output, while U3C....