Popular Circuits Page 75
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Where N is the binary number from 0 to 15 formed by the digital input. If the analog input is a fixed de reference, the circuit is a conventional 4-bit D to ac signal, in which case the output is the product of the analog signal and the digital signal. The....
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It is said that the mice are more sensitive to electromagnetic fields, which is why the high-voltage grid rodent generally poor results. Electronic rodent control described here, no high-voltage power line usually, it does not cause mouse alert,..
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The PCD3360 is a CMOS integrated circuit, designed to replace the electro-mechanical bell in telephone sets. It meets most postal requirements, with selectivity of output Tone sequences and input ringer frequencies. Output signals for a loudspeaker or for a....
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This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs.....
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Here's PLL FM transmitter circuit from china. This circuit uses the familiar 2SC1971 for final power amplifier stage. The PLL controller of the FM transmitter use SAA1057 and PIC16F628 (download HEX file)...
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Greetings to all. This is my first post, yet I am no stranger. Please accept my thanks for the many postings all of you have made: you have taught me....
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This CFL lighting kit is available from a reputed brand alfa, which is known for it`s circuits in applications of inverter like products. We get a good stable circuit from them. The below kit is for lighting a PL of 9Watt, 11Watt or a CFL of upto 20 watt (of....
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This circuit shows how a 4017 CMOS decade counter can be used to build a timer circuit. Push-button S1 will discharge capacitor C1 through resistor R2. When S1 is released, C1 will charge up through R1 causing a rising edge at the clock input of IC1. This....
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
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The circuit provides unambiguous LED + or - bar readout with steps of 0.1%. The reference frequency is multiplied by the PLLIC1 and divider IC9 to output 64 ? F (ref) and this is then gated by dividing F (measure) by 32 in IC8 thus is F (ref) = (measure)....
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Zilog`s Z8 Encore XP F1680 Series incorporates a best-in-class feature set that is optimized for stepper motor microstepping controls. The features of Z8 Encore! XP F1680 include: A fast 11 MHz internal Oscillator Two Analog Comparators 10-bit....
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The LTC®1197/LTC1199 10-bit serial ADCs offer small size, low power operation and fast sample rates with good AC and DC performance. These parts are ideal for low power, high speed and/or compact designs. This Design Note discusses the features and....
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This low-power converter will supply about 100 mW of dc to a load and it is useful to isolate or derive dc voltages. It operates at around 200 kHz. LI is wound on a 22-mm diameter 13-mm high pot core with #32 magnet wire. The primary is 80 turns and the....
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Who would like to build a sidetone oscillator with a minimum amount of parts should try the NE567 integrated circuit. The NE567 is a PLL circuit with an internal VCO for a operating frequency less than 500 kHz and it is normally used as an audio tone....
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This volume controller equalizer electronic project is designed using LM1036 DC tone volume controller with volume and balance circuit for stereo applications. An additional control input of the LM1036 allows loudness compensation to be simply effected. The....
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The ULN2003 internally employs high voltage, high current darlington arrays each containing seven open collector darlington pairs with common emitters.Read More....
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radio transmitters for evesdropping on private conversations and sending video pictures, battery operated....
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This circuit uses a microcontroller I/O pin to control a high power load such as a motor, without risking damage to the sensitive circuits of the micr....
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This continuity checker (built around an LM339 quad comparator with open-collector outputs) eliminates false r..
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I`ve seen this circuit around before, but it kept cropping up while looking at other electronics videos on YouTube. It`s called a Joule Thief, and it was....
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In the figure is the NE555 FM modulation circuit. In the figure, NE555 7-pin is connected with a FM modulation circuit which is composed with R5 and C2, but the frequency range is kind of small. VT1 and VT2 form a current Miller circuit, which generates a....
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By using two 8-bit ADC channels for the same signal, the technique in Figure 1 can accommodate both conditions. One channel, which the controller uses for fast motion, reads the input directly and adds four 0 LSBs for a 12-bit result. The second channel....
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The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small signal transistors are....
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The preamplifier offers 20dB in all the region of VHF and it still can reach also their 500MHZ. The amplifier is a circuit of high frequency RF with distinguishable materials. The amplifier as circuit strengthens the tendency of signal with concrete aid,....
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The three-amplifier implementation of the state-variable filter in Figure 1 provides for second-order bandpass, highpass, and lowpass responses. The strength of the circuit, however, is in the bandpass response (VOUT/VIN), in which it`s easy to achieve high....
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Circuit is shown. It consists of a temperature sensor, temperature control of electronic switches and circuits composed vocal language. In the hot summer season, PCs central pr..
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The heart of the lock is the 40022 octal counter. When first powered C2 is charged via R5 so the reset input of the counter is kept high. That causes output Q to go high while all the other outputs are low. With the switches wired as shown, when S4 is....
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The NCP5080 product is a high voltage boost driver dedicated to the Xenon power flashes. The built-in DC/DC converter is based on a flyback structure with an external transformer to adapt any range of high voltage demand. The external feedback network makes....
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This self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages. The isolator is intended to provide electrical isolation between a computer and the....
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A Pierce Oscillator is a type of oscillator that uses a crystal instead of a parallel-resonant circuit [LC circuit]. A pierce oscillator also uses the voltage developed from a tap between two capacitors in the tank circuit, as shown to the right. range. Both....
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is circuit was requested from an email. It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer. It is used in the astable mode. The 555 timer output will go....
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This circuit is the variable output switching regulator for general purpose applications. An LM105 positive regulator is used as the amplifier-reference for the switching regulator. Positive feedback to induce switching is obtained from the LM105 at pin 1....
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When the torque load on the motor increases, its current increases. This current increase is sensed across Rs, and positive feedback is applied to the noninverting terminal of the LH0101, thereby increasing the motor voltage to compensate for the increased....
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The AD8055-based amplifier has greater-than-100-MHz bandwidth, fully adequate for the 10-MHz oscilloscope. Its input impedance is 1 M in parallel with 30 pF to match the oscilloscope`s input and its low-capacitance probes. Figure 2b shows the final eye....
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This page presents information on infrared - `Across The Track` train detection circuits. The circuits are designed around the LM339 comparator chip and can use a wide assortment of matched infrared - emitter / detector pairs...
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This circuit included in the category astable multivibrator. This circuit is used to test? N-Mosfets (the power kind e.g irf830), whether it works or not. If...
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Meteoplug is a client-server. The client application needs minimal storage and computing power, which allows for embedding into "computers" of minimal size and with minimal power demands down to1 watt(depending on efficiency of power supply itcan be 1-2....
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The ISL62381, ISL62382, ISL62383, ISL62381C, ISL62382C and ISL62383C family of controllers generate supply voltages for battery-powered systems. These controllers include two pulse-width modulation (PWM) controllers, adjustable from 0. 6V to 5. 5V, and two....
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The achievement of this 30 watt amp was thought to take place on a heatsink microprocessor PC. Equipped with its fans, the advantage of this method of cooling was chosen for the fact it is common and not very expensive. The size of the printed circuit will....
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As shown, the diode IN4148 series in V + and loop to prevent line damage due to reverse device in the loop loss only 0.7V (silicon diode forward voltage drop) of the power supp..
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The circuit illustrates a way to power CMOS ICs from RS-232C lines. The MAX680 is normally used to genera..
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A variable power supply with adjustable voltage and current outputs made with the L200 regulator. Using the versatile L200 voltage regulator, this power s....
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The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:..
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The Voice Changer has two different inputs, the microphone and the switches. The Voice Changer then outputs a signal to an OpAmp to amplify the signal being sent to the speaker. The frequency of this signal is changed depending on what voice effect is turned....
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To increase one`s chances of seeing the northern lights, the uncertainties of existing aurora prediction methods can be bypassed by sensing the light from the aurora directly. The Aurora Alarm is a device which accomplishes this objective through the use of....
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This is an early picture of my discolight effect. Because of the AGC circuit theres no need for potentionmeters for sensitivity adjust. I replaced them with trimmers. Now the microphone is on the control electronics because theres no need to place it outside....
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Speed controllers have long exploited the reverse-EMF characteristics of dc motors to control their speed. These linear driver circuits use power op amps to create a negative resistance drive to the motor that counteracts the voltage drop in the motor`s....
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The circuit operates from a 5-V supply arid has a current consumption of 2 mA. The output is a current source that drives or suppresses a current of more than 75 with a voltage swing of 4.5 V. The Q-killer circuit eliminates distortion of the output pulses....
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The two final power of TR2-TR4 should be mounted on heatsink the right size, otherwise they will overheat. You can choose from MJ4033 MJ3007 or more, provided that the NPN. The maximum power output that can be used depending on the size of the core of the....
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This is a circuit design for high current toggle switch. This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location and switched off from another. Any number....
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Vacuum tube electronic circuits operate from comparatively high DC voltages (150 to 600 volts). The Electric Utility supplies 120 volts AC. We have studied transformers and, therefore, we know that the 120 vAC line voltage could be stepped up to the....
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This system, composed of two opto-insulated circuits, allows the data transmission per infra-red network device between two computers. For example, someone can transfer his files starting from his desktop computer to his laptop computer without using any....
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This circuit can charge automatically, fast and rightly, batteries 6V and 12V. A basic factor in the success in the circuit operation is the use of transformer [T1] of good quality with very good insulation and resistance in the short circuits....
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the circuit diagram of a simple radio that uses one transistor and few other passive components.. Component: Diode, Capacitor, Inductor, Resistor, ....
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Before I emailed Pablo Gian Villamil and he sent me on a link to his class notes (yay!) for Generating polyphonic sound with Arduino I tried to work out his circuitry from his various blog posts and component listings CMOS Hex Schmitt Trigger Inverter....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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The basic techniques of designing electro-mechanical systems and to gain the knowledge on tuning and controlling dynamic systems. The design of this course should attract special interests of many universities becauseit actually requires students to build....
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The chief advantage of this programmer is its ability to protect both the target and the PC from odd voltages when one side is powered off. The buffers are open-drain, and each is pulled up to the Vcc of the receiving party. The MC74LCX07 has an operating....
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The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003 [update], it is estimated that....
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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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The LED meter is simpler and smaller than it`s analogue counterpart, and is very common in audio equipment. This version is based on a National Semiconductor IC, and uses the logarithmic version. Each LED operates with a 3dB difference from the previous one,....
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Automobile Interior Lights Fader Circuit diagram Circuit This circuit is similar to the fading eyes circuit above and is used to slowly brighten and fade interior lights of older cars. The circuit is based around the LM324 low p....
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It`s well known that many animals are particularly sensitive to high-frequency sounds that humans can`t hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. My aim was, however, to....
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This ROM emulator improves the easiness to build/use it by reducing down its function which can be used as a ROM emurator. The kind of the ROM types to be emulated, are 2764, 27128 and 27256. The debugging capability is only Load and Run, omit functions such....
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The battery-operated black light uses a U-shaped, unfiltered, black-light tube, which requires approximately 250 Vac to operate. To create the 250-Vac 6-V battery, the circuit uses a one-transis-tor blocking oscillator that drives a ferrite inverter....
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The IR circuit can be used to switch devices using TV Remote. Normal circuits can switch only one device. But using this circuit, different devices can be controlled using same remote with different switches. In this circuit, we interfaced 8 devices. These....
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Is it possible to alter a single-cycle datapath so that an add instruction not only writes to a register, but also writes to a specified memory address The only way I can think to do this is to split the value as shown bellow. I don`t think this is possible....
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The Atmel Flash devices are ideal for developing, since they can be reprogrammed easy and fast. If you need more code space for your application, particularly for developing 89Cxx projects with C language. Atmel offers a broad range of microcontrollers based....
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Voltage regulator ICs (78xx series) provide a steady output voltage, as against a widely fluctuating input supply, when the common terminal is grounded. Any voltage about zero volt (ground) connected in the common terminal is added to the output voltage.....
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A PIC16F84 introduction with ICSP programmer connection and circuit example....
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The figure below shows a schematic of a very interesting sensitive mic circuit which will boost faint sounds from distance. The circuit is quite sensitive and provides good gain to weak audio signals....
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Ideal to operate 3 to 24V DC existing on-circuit lamps This circuit was designed to provide that continuous light lamps already wired into a circuit, beco....
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This stereo mixer has two mono mixers and a modification to the microphone inputs. When a microphone is in u..
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This is an image Schematic. No Description available...
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I designed the simplest remote-controlled autocue system possible with materials that i unburied from my old-and-busted bin, my old P4 laptop, a totally broken USB keyboard, a piece of plexiglass. A foot-switch controls the scrolling of the text in the....
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This low cost automatic emergency lighting circuit turns on a lamp during power failures. It is powered by a NiCad battery that is being charged by the mai...
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This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat button cell. There is not much to the circuit. The UM66 is connected to its supply and its output fed....
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The reason why I'm using a LCD display is because it allow me to display many characters and it doesn't need to be "refreshed" as 7-segment Led displays. Also, the interface requieres less I/O pins.
For this project I used a 16x1 LCD Display with 4-bits....
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A muscle-powered capacitor charger contains only a few components: a storage capacitor, a bridge rectifier, and a voltage-limiting zener diode that protects the capacitor from excessive voltages (Figure 1)...
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National Semiconductor (NS Company) production of audio ICs wide frequency response, low noise, assembled with its audio circuits, very good performance in all NS o The company integrated ..
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Function: To prevent equipment damage from pressure., and for delay other appliances connected to the output of the relay. 4011 IC, Diode, Relay, ....
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The battery capacity is the important index of weighing battery quality. There are many methods in the volume test of the rechargeable battery. Can be according to the discharge curve of the battery, carry on short time and discharge, thus so rough as to the....
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Clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. The clock includes a calendar with leap year and optional daylight savings adjustments. The timer output can be set from 1 to 59 minutes and manually....
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When the switch is pressed C3 charges up through R4 with a time constant of 0. 47 seconds and when the switch is released C3 begins a slower discharge through R7 and R3 with a time constant of about 5 seconds. The op amp 358 used in this project is set up as....
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This web site provides schematics and instructions to construct a keypad circuit that can be interfaced to a PC using an 8255 PC interface board. The keypad is directly connected to a "client" computer that in turn transmits information from the keypad over....
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The circuit needs that the VGA card sends out the video signal the the RGB format compatible with PAL or NTSC standard video timings. This is accomplished with right VGA to TV driver...
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I will be using the bike eventually for quite long trips, off roading at night and dual sport riding, so the bike needs good headlamps, indicators and an accessory socket. To this end, I fitted the bike with a 12v 10AH battery, on two custom lugs welded to....
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It works semiconductor color sensor can be summarized as follows. The figure shows the spectral response curve of two photodiodes have a point of intersection, when the wavelength of the light incident on the corresponding intersection,..
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This is a sensitive, mini-powered FM transmitter consisting of an rf oscillator section interfaced with a high-sensitivity wide passband audio amplifier and capacitance microphone with built-in FET that modulates the base of the rf oscillator transistor.....
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This page describes a project a colleague and I completed between September, 2000 and March, 2001 as part of the Engineering Physics degree program at the University of British Columbia. In summary this project involved building a USB device using the PIC....
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Amplifier circuit equivalent O assumed input of the circuit plus two equal and opposite polarity signals (differential mode signal). The two tube collector current Ic, and IC7 ..
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Simple circuit diagram is a schematic remote control, remote control where it consists of two parts of the transmitter and receiver. The first part is a transmitter, circuit diagrams for transmitter IC is controlled by the NE555. This system works by....