Popular Circuits Page 108
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The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here....
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Using the LTC3113 fixed frequency, buck-boost DC DC converter can be designed various power supplies circuits that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides low noise operation,....
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Here`s a design circuit for frequency modulator that is completed with tuning circuit. In this circuit is using pair of 1N4007s are used as varactor diodes. I picked 1N4007s not because they are particularly well suited, but simply that I had some on the....
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Here`s a nice little circuit diagram for all those hardcore DIYers if you are trying to build a dual fan controller using an ATtiny45 although I`d never use this thing, I`d rather use a CUBLOC. Over the course of a weekend, I cobbled together some leftover....
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Circuit shown in Figure 3-5. It can be manual (button SB) and light control (phototransistor VTj). When the light of a flashlight quasi VTi, fans will turn on the operation, an..
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Using a K-12 tube amp with a NAD C542 CD player, there is no need for a buffer or line level preamplifier. The K-12 is a very polite and sweet amp with all the warmth of it`s "hot bottle" heritage. However, when I compare the K-12 with my monoblock chip amps....
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The objective of the project is the design of an imager chip for laser-scanned 3-D depth/range finding. The project is divided into two modules: Pixel Array/Centroid Detection and Analog-to-Digital Conversion (ADC). The pixel array/centroid detector tracks....
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The core infrared theory for getting this tutorial working was already described in the Infrared Receiver tutorial, so I`ll run through an abridged version here. First I`ll describe as an overview what infrared is and how it relates to our lives, then I`ll....
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Buffered video amplifier is used wherever the use of video player to the receiver / monitor TV with a long cable may cause a drop in signal amplitude and as a consequence, the deterioration in image quality. The amplifier can also be used to connect multiple....
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Build your own simple mini FM transmitter. This fun project will show you how to build a mini broadcasting transmitter that can transmit an audio signal up to a quarter mile to any FM receiver. It`s easy to build and a good learning experience. It serves as....
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Circuit as shown, it is by the sound transducer sensing switch/electrical, light control switch, SCR control circuit, vocal music circuit and the AC step-down rectifier circuit..
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General filters are bandpass filters that usually employ bridging couplings between nonadjacent interstage couplings (Reference 1). This class of filters also includes bridging coupling across the filter input and output ports. The implementation of....
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The optically-controlled circuit has essential function in urban street lamps or corridors are lighted, adopt the optically-controlled circuit, can open and shut off the lighting lamp automatically according to power of the light, make sure nobody....
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The first circuit is a simple preamplifier showing the power arangements for conveying DC to the amplifier via the coaxial cable. The second circuit is a small modification so the antenna can still be used for transmitting. The actual preamplifier in this....
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In some versions you don`t have the input buffer at all, and in some versions the buffer transistors have different biasing or different transistors. Some have even BIG errors. Errorswith the biasing, errors with the transistor symbols. I understand that the....
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The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
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It can be helpful to rapidly and easily determine the polarity (npn or pnp) and function of a transistor. The pocket-transistor tester in Figure 1 is ideal for quickly testing without regard to such parameters as gain and frequency response. You connect the....
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This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it....
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The circuit is economical in components, and will work with virtually any transistors and is reliably self-starting. The voltage Vb can be taken from a divider, as shown at the right. If taken from a fixed source, flashing becomes slower as battery voltage....
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This a simple stereo electret microphone pre amplifier circuit. For maximum performance, use solid capacitors or film capacitors and metal film resistors. Here the simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple,....
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After building the Mighty Mite amplifier project, I found that it needed something extra to give it character. I thought a nice Hendrix-style fuzz face would add a nice edge to the tone as well as allow some character to come along with low-volume playing.....
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Differential amplifier circuit four connection methods and compare the characteristics of a a. O magnification and single-pipe with When the circuit is symmetrical common-mode ..
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22 Watt Stereo Amplifier circuit diagram. This circuit can be used for audio home amplifier and car audio amplifiers. It is extremely simple design, inexpensive and very easy to build. Even a newbie hobbyst will easy assemble this circuit. The scheme given....
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This is the complete schematic for the circuit that is contained on the AMZ Multi-Purpose PC Board. None of the example circuits will utilize every part that has been positioned on the board. Extra parts have been included to add flexibility and options to....
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The simplest Analog to Digital Converter (ADC) can be constructed as shown in Figure 1. Input voltage which can range from zero up to power supply voltage (Vcc) converts to parallel additional binary code at the outputs of the converter. For normal operation....
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An aid conversion technique which combines some of the speed advantages of flash conversion with the circuitry savings of successive approximation is termed half-flash. In an 8-bit, half-flash converter, two 4-bit flash aid sections are combined. The upper....
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TDA7000 is an IC for FM portable radios which has a Frequency-Locked-Loop system with an intermediate frequency of 70kHz. The TDA7000 has the following functions: RF input stage, mixer, local oscilator, IF demodulator, mute detector and mute switch. The....
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The guitar is a wonderful musical instrument which is capable of providing both melody and rhythm. However, every guitar player would have experienced the problem of low volume. The guitar is rarely heard unless the surroundings are absolutely quiet! To....
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Here is an ideal mobile charger using 1.5 volt pen cells to charge mobile phone while traveling. It can replenish cell phone battery three or four times in....
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A simple tester can be used for routine checks for resistance on production lines of relays, coils, or similar components where frequent changes in resistance to be tested are not required. The tester is built around a single quad op amp chip, the LM324. R,....
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This circuit is a toy to encourage young children to count. Power is turned on by switch S1, then S2 is closed. This makes nine LEDs flash slowly. S2 is then opened and the LEDs go out. Pressing push-button PB1 turns on a random number of LEDs - briefly -....
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Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using minimal exterior elements. Substantially he is one of big completed force. Has a line pins and incorporated metal surface for adaptation in cooler. The provision....
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The supply 6-66 can be used for supply output voltages from 1 to 35 V. The line transformer should be selected to give about1.4 times the desired output voltage from the positive side of filter capacitor C1 to ground. Potentiometer R2 sets the output....
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R1 = 470K N1, N2 = MC14093B R2 = 15M* T1 = 2N3906 (these will work also: PN200, 2N4413) C1-C4 = 2N2 (2. 2nF) (NTE159, ECG159, BC557, BC157, TUP ) D1 = 1N4001 Ry = Relay (12V or matching supply voltage) D2, 3 = 1N4148 Sensor = Stainless Steel probes, brass,....
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This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting. The circuit was designed and....
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As shown in FIG alarm by a buck rectifier and voltage regulator circuit, gas sensor, comparator circuit and sound the alarm circuit. Buck regulator circuit by a transformer rec..
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CMOS Digital Camera Controller and Frame Capture Device...
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The circuit of the transmitter is shown in Figure 1, and as you can see it is quite simple. The first stage is the oscillator, and is tuned with the variable capacitor. Select an unused frequency, and carefully adjust C3 until the background noise stops (you....
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The nitrogen (N2) laser produces intense extremely short (a few ns) intense (100 kW typical) pulses of light in the near UV portion of the E/M spectrum (337. 1 nm being the dominent line). Despite this impressive capability, the N2 laser is among the easiest....
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Battery forklifts are railway stations, docks, warehouses balloon-like plant in two commonly used as a stacking and handling tools. Pictured It forklift battery shape and elect..
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You can use this water level alarm circuit anywhere as a water level indicator to detect the desired level of water for example in tanks, swimming pools or at any place where you store water. The circuit is build around a 555 timer IC which is a famous and....
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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When the light incident on the LASCR is interrupted, the voltage at the anode to the 2N4990 unilateral switch goes positive on the next positive cycle of the power which in turn triggers the switch and the C230 SCR when the switching voltage of the....
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Yesterday we covered the Dangerous DSO analog front end. This circuit divides our +/-10volt input to +/-0.5volts, and re-centers it between the 2volt and 3volt range the ADC can measure. Today we`ll simulate the circuit to get a better feel for how it works.....
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This is an old Dynacord Eminent Amplifier, featuring 5 x ECC83, 2 x EL34, GZ34 rectifier and EM84 "Magic Eye". It has two instrument and two microphone inputs with separate bass/treble controls and a master volume. I got it for 50 Euro in VERY used condition....
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i have a fujiya fl-555 (schematic attached) that i am having problems with. the recorder`s volume is very low even at maximum setting. it was working....
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The circuit was created to produce an oscillator operating at low frequency for use in the production of electronic music and experimenting and testing to....
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A standard 12-volt auto electrical system can be considered to be a powerful but unreliable source of low-voltage DC current. Some of the features any mobile PC installation should provide include: Automotive systems must be designed to strict electrical....
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Electrolytic capacitors are unnecessary to generate a 1 cps frequency. As an scs triggers on, the 0.2 µ¥ commutating capacitor turns off the other one and charges its gate capacitor to a negative potential. The gate capacitor charges towards 24 volts....
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This egg timer, which is both simple and functional, shows once again that it is not essential to use a microcontroller for everything these days. The circuit consists of only two ICs from the standard 4000 logic family, a multi-position rotary switch and a....
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Infrared Remote Control Switch Circuit Remote controls, specially cordless type, are very popular nowadays. Here is a simple and....
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This circuit can be used to measure exhaust gas temperature in a furnace. The 10-bit LTC1091A gives 0.5°C resolution over a ooc to 500°C range. The LTC1050 amplifies and filters the thermocouple signal, the LT1025A provides cold junction compensation and....
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This Project Digital Calendar using Microcontroller is an advanced digital calendar, which displays the Date, Day, Month over the LED display. It has an 8 bit Microcontroller which runs on the Program embedded on its ROM. Separate LEDs are provided for the....
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Attached to a separate harmonic generator stator windings, leads to the third harmonic voltage thyristor rectifier supply made after the motor field. Since the output voltage v..
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Using TDA7250 audio driver manufactured by SGS Thomson, can be designed a very simple high power audio amplifier electronic project using few external electronic parts. This TDA7250 audio amplifier electronic project can be used using a 4 ohms load or a 8....
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The first circuit energizes the relay when the temperature rises above the preset level. The second circuit energizes the relay when the temperature falls below the preset level. The two circuits are practically identical. The only difference between them is....
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Can be used agains ferocious animals or attackers, BUT REMEMBER, this device may be illegal in your state..
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This oscillator uses a very large capacitance-to-inductance ratio. L1 is a one-tum coil consisting of a loop of #12 wire 12 in diameter. This circuit is useful for metal detectors, etc., where a loop antenna is used....
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Circuit principle: circuit after transformer, bridge rectifier and conditioning on the battery charge, the charge current transformer can be adjusted simply give about 12v 100A..
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We all know how a dip meter works and what it measures - the resonance of an LC circuit. The circuit featured here is designed to work in the VHF range. The tester coil is inserted in the LX terminals and placed near the LC circuit to be tested. The variable....
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A nice design which even turns off if the pushbutton is held depressed or jammed a long time. Not re-triggerable while the light is still on though(Thanks for pointing that out Watson): Below is one that starts off bright and slowly dims out to nothing. They....
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No matter WHAT the label on the radio (or the seller) says, no Spectra will ever operate over the entire 136-174MHz (high band) or 403-512MHz (UHF) frequency range. Each unit will do only a portion of that band`s frequency spread, and that portion is called....
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Chip power later, when the strobe IEB held low, the memory can be transferred to the instruction, address, write or read data. All means order, address, data transfer is starte..
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A circuit for multiplying the width of incoming pulses by a factor greater or less than unity is simple to build and has the feature that the multiplying factor can be selected by adjusting one potentiometer only. The multiplying factor is determined by....
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A simple but useful circuit for all they have problem with parking car, in spaces without good visibility. The electric circuit appears in picture 1. It is constituted by the IC1 and components round he. When the car bumper touch soft and push lightly the....
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As shown in FIG, XTR110 internal voltage reference output current of 10mA, add an external NPN transistor QREF can expand the output current. When VCC rises to 40V, the transis..
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple heat-sinking,....
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As is commonly the case, this supply was born of necessity. There is absolutely nothing special about the circuit, except that as shown, it is quite capable of up to 20 Amps intermittently or 10A continuous. Simply use a bigger transformer, bridge rectifier....
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This circuit shows a 2W RF amplifier circuit . This amplifier is based on the M/A-Com LF2810A MOSFET. The transistor is actually a 10 watt, 28 ....
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It use the three transistor (2SC945, or 2C1815 or 2SC828) is main Which typical transistor amplifier with a low noise this circuit, too. There are about 200-300 times the gain. The frequency response is 50Hz to 100KHz. I have an old microphone, I want to....
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A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise....
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This circuit is a toy to encourage young children to count. Power is turned on by switch S1, then S2 is closed. This makes nine LEDs flash slowly. S2 is then opened and the LEDs go out. Pressing pushbutton PB1 turns on a random number of LEDs - briefly -....
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This is a design circuit diagram of a versatile FM transmitter. This circuit doesn`t have a coil. The circuit is simple and easy to assemble. This circuit is work based on gate logic concept. This is the figure of the circuit. The gate N1 acts as a buffer....
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Designing a true constant-current AA NiMH charger, and want to select a power supply that will be just right. I want a high enough voltage to that the CC transistor doesn`t saturate, yet low enough voltage to reduce the power dissipation in the transistor. I....
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The aim of this design is to reproduce a Combo amplifier of the type very common in the `sixties and the `seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or....
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Most models produced in the 30s rely on very similar circuits; in particular the RF section of most sets relies on the same LW-MW-SW scheme while the differences between different sets are based on the presence or absence of the variable selectivity control,....
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Hello, I`d like to automate some functions in my house, particularly, turn on and off CFL lamps with a triac coupled to the logic via a zero crossing....
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The following circuit shows a RF Remote Control Circuit Diagram. This circuit based on the HT12E IC. Features: original data in the parallel format, decoder IC receives the signal via the RF receiver module, using ASK (Amplitude Shift Keying) based Tx/Rx....
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The only way to know how fast a particular battery can recharge itself is to put it under load, vary the switching frequencies, on / off times, & then plot the results. A circuit drawing 0. 5 Amps at 12 Volts will charge a battery slowly, so increasing the....
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As shown, the circuit adds an optical coupler (CNY75A) and adjustable precision shunt regulator (TL431). Current limiting resistor R3, R4 and R5 for the sampling resistor. When..
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Capacitor C5 and potentiometer R12 determine the frequency of the output signal at pin 3 of IC1, the 555 oscillator. The output signal is differentiated by C3 and C4 before it"s input to the base of power transistors Q1 and Q2 via diodes D1 and D2,....
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This voltage regulator circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find. The transformer....
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The circuit in Figure 1 provides not only a complementary drive signal but also a deadtime delay on both rising and falling edges. The high-speed inverter gates use IC1, a 74HC04 CMOS circuit, and 1N5819 Schottky diodes D1 and D2. The 74HC04 inverter....
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I`m not planning to remove the links to stable versions right now. Want to do it at the end of this month to exclude for sure any possible issues with ....
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This is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct ....