Popular Circuits Page 268
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Single pulse signal generating circuit d Shown as a single pulse signal generating circuit, switch contacts such as the use of such a digital signal reset signal or the stop signal is to be formed, this one-shot pulse generating circuit can be used. This....
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As shown for the basic application circuit thermistor. Figure (a) of the basic temperature measurement circuit. The circuit temperature measurement accuracy is not high, can on..
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As illustrated, is the use of an integrated Hall element AC motor off circuit, which is a magnet and other magnetic objects close to the Hall IC element of the induction motor ..
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Amplifier A increases the microphone"s output to a usable level. The output signal is fed to op amp B, which inverts the signal180°. A balance-control potentiometer connects across the outputs of amplifiers A and B. 1f an audio tone is fed into the....
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The NPD5566 monolithic dual is used in a differential multiplex application where Rds(ON> should be closely matched) for the monolithic dual tracks at better than ±1% over wide temperature ranges (-25° C to +125° C), this makes it an unusual but ideal....
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This circuit is based on a standard LT1074CT switching regulator IC. For sure, Application Note AN35 published by Linear Technology describes the design far more elegantly than the author could in this short article. Interested readers are therefore strongly....
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In this schematic, provided by Jimmy M, would this circuit drain the batteries when the light is not in use? I`m considering building a mosfet circuit like this to use in a compact M@g where I discard the original bulky switch and use a microswitch to....
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The oscillator based on IC2 is responsible for producing the sound. Its output is connected to the base of TR1, which amplifies it to drive the speaker. Resistor R4 is included in the circuit to limit the current through TR1 to a safe and reasonable level.....
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This room light controller project automatically using Microcontroller Visitors Counter is a reliable circuit that takes the task of controlling the room...
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It uses standard components, gives a good sine wave and is fairly immune to the type of op ampit is designed around. It can, however, be misunderstood, and over simplifications as to its operation can leave the designer thinking that it is not as well....
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A robot named "Wet Dream" was constructed whose purpose was to roam around, avoid collisions, locate people, and squirt people with an onboard motorized water gun. The robot was built to maneuver in an unstructured environment and be able to react....
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Neural networks are wide topic. But this small example demonstrates how to create basic neural sensor which takes resistive readings from multiply sensors and multiply it by wight factor and then sum the results. Results are compared to three level....
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This is linear amplifier which need advance knowledge in electronics since the schematic diagram is very complex for hand made circuit. I think you have to re-design the schematic diagram using circuit diagram design software such as diptrace, eagle,....
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Be sure to use the correct 9-pin `D` type connector so the pins fit in the board. The two outer holes for mounting the 9-pin `D` type connector should be 3mm Dia. and the holes for the pins are 1. 2mm Dia. The PCB is also tailored for a PCB mounting 5-pin....
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The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special devices and can be built using components that you will no doubt be able to find in the junk box. The alarm-triggering....
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Digital ICs and opto-isolators provide the drive for this TMOS servo amplifier, resulting in fewer analog circuits and less drift. Fast and consistent turn-on and turn-off characteristics also enable accurate analog output results directly from the digital....
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The simplest I to V converter is the humble resistor. However, presenting a nonzero impedance to the source of input current is the disadvantage of the humble...
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Video recorder, DVD player and TV game, have component video output. The component video signal is like RGB video signal, but it cannot connect to RGB monitor...
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Optical toggle switch using a single Chip. Using dual flip-flop IC CD4027 employ a 555 based monostable circuit to supply input clock pulses. The circuit described here obviates this requirement. One...
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LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SI, makes contact,..
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Christmas Star. This circuit can be used to construct an attractive Christmas Star. When we switch on this circuit, the brightness of lamp L1 gradually increases. When it...
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DC fan control circuit for power amplifier. Variable speed DC fan This series of works based on the input signal. Speed / fan rotation depending on size of the input signal coming from speaker lines. If there is no signal then the fan will spin slowly....
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Solar battery charger schematic & description. This solar battery charger circuit can charge 12v lead acid battery or sla battery. ....
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A DC to DC converter is needed for a board that only has +5V supply but have to provide dual-polarity supplies for few device such as op-amp or some DAC. Using....
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As a result of the relay control (several pairs of contacts, if more capacity is connected in parallel), so the lamp power can be large, the circuit is very simple, just change..
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This demodulator is suitable for the quadrature phase-shift keying (QPSK) modulator previously published by the same author, "Novel Low-Cost QPSK Modulator Needs No Adjustments" (electronic design, Sept. 16, 2002, p. 92). Also based on common CMOS logic, it....
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Wien bridge oscillator. A phase-shift feedback oscillator that uses a Wien bridge as the....
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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This screen uses ten LEDs to display a voltage range of 10.5 to 15 volts. Each LED represents a step 0.5wvolt tension. The heart of the circuit is the 3914 points LM / bar display driver. Trimming potentiometer R5 is adjusted so that 7.5 volts is applied to....
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As shown in FIG grounds PGA202 and comparators, counters constitute automatic range switching circuit. The circuit at the output of the comparator compares VOUT when VOUT VREF ..
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To get enough outputs from the PIC chip, a pair of 74HC164 shift registers was used. These need only two lines from the PIC (data & shift) to produce the twelve signal pulses for the servos. A single bit is shifted into the first shift register, then, after....
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Circuit shown in Figure 3-168, which uses the controller SA grading speed and reversing control; reverse brake connected to the rotor circuit overcurrent relay KI to control; c..
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This amplifier can transfer dc-to 5-MHz signals across a potential difference of 25 000 V. This circu..
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The LMP91200 is a configurable sensor AFE instead of manage indoors low power analytical sensing applications. The LMP91200 is designed for 2-electrode sensors. This device provides all of the functionality looked-for to detect changes based on a delta....
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When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in the tank connected to S1 and the + supply are shorted by....
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One thing we should keep in mind is that the EC10 is now a vintage receiver, it has collector appeal. Any-thing we do should really be carried out in a manner that preserves the original state, most of the following adheres to this. Things like replacing all....
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An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a....
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TDA7000 is a famous FM radio receiver IC also called one chip FM radio receiver covers VHF FM band from 70 to 120 MHZ. This IC was first introduced in 1980`s and gained very popularity in the electronics world and it is still very popular after 31 years. The....
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This is a simple display controller. It can be controlled with a small microcontroller, such as MCS51, 68HC11, Z80, AVR and others.
Several years ago, I found an article that controlling a TV with only a PIC micorcontroller, and I surprised to it. It is....
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TDA2050 Audio Amplifier circuit diagram. There is a current environmental protection: the signal from the output passes through the connecting cables and chains of the column (in this case takes into account the reactance of the circuit section of the 4th....
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The amplifier in the following schematic, when simulated, shows that it can cleanly amplify a signal with 0. 1V amplitude to 10V. When driven with a larger signal, though, the behavior is very nasty in the positive half cycle. The output suddenly dives from....
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The microcontroller is an AT90S8535-P in a DIP40 package. Note that this microcontroller is pin by pin, hardware compatible with other members of the analog series of AVR microcontrollers, like ATMega8535 and ATMega16. However, there are many differences....
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Speaker relay delay controlling circuit for audio amplidier..
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Outputs from each channel are fed to the two inputs of ICl connected as a differential amplifier. IC2 and 3 are driven by the output of ICl. Output of ICl is connected to the noninverting inputs of IC2 and 3. If the output of ICl approaches the supply rail,....
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In this USB circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone, or again through the power amlplifier strengthened so that it can be heard through the speakers. IC used in this circuit using IC....
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A development board for practicing 8051 microcontrollers. The development board is simple one containing minimum hardware required for a 8051 chip to function. The 8051 chip used in this development board is 89S52. The AT89S52 comes in a 40 pin PDIP package.....
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This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will eventually pay off because you no longer have to throw away your NiCds after three months or so of....
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The basic requirements than one laboratory power supply, it is to provide voltages and currents of operation that need the usual units, to have low output resistance, low noise, small ripple and good stabilization. The above requirements are covered, from....
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The circuit of the mains current detector is shown in Figure 1. By using a few cheap diodes, a resistor, LED and LDR, a simple opto-isolated detector can be created. This entire circuit dissipates very low power, and can safely be housed in a heatshrink....
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This is a useful instrument for works hops. The standard of the produced frequencies is 10 to 1. The basic frequency is produced by a crystal with high accuracy. The circuit is consisted by the oscillator, around the crystal and the frequency divider, which....
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This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon. This small transmitter is simple to build and its transmissions could be picked up on any common FM radio. It possesses a range of approximately 1/4-mile (400....
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SP6331 SP6333 SP6335 Quad ower Supervisory Circuits are a family of Microprocessor reset Supervisory Circuits with multiple reset voltages. The 3 device family provides low voltage monitoring ability for up to four supplies with two precision factory-set....
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L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
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The following circuit shows about Light Activated Switch Circuit Diagram. This circuit based on the LM311 IC Features: voltage comparator circuit ....
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Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one transistor carbon mic converter takes a carbon mic input and converts it to the magnetic variety. Note that no ground connection is used, even if the circuit is built....
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amplifier, with bias at cutoff. Q5 acts much like a grid-leak detector. Without the subcarrier input, the demodulator cuts off and prevents signals from passing. Of course, the chroma signal must be at a low level. Otherwise, chroma might gate the....
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This receiver covers 8.5 to 11.5 MHz in two bands and has a sensitivity of under 1 ?V. Nn NE602 mixer feeds a 455-kHz IF amplifier (Q1 and Q2), detector D4, and audio amplifier IC2. Q4 serves as an AGC amplifier coil data is given in the table. The LO is....
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This is the 8W audio amplifier with IC LM383 as the main component. Very simple, easy and cheap circuit...
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The Dish Network 322 Satellite Receiver accommodates television viewing of two different programs in two different locations. This is a schematic block diagram of an exemplary circuit logic diagram. The receiver can predict the elevation angle of each....
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Many cable testers have been published before, some quite complex, but here`s a cheap and simple alternative. It uses only a 9V battery, two mating connecators and a few resistors, as well as a multimeter for voltage measurements. Begin by soldering the....
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This circuit consists of a CMOS square wave oscillator on a frequency of approximately 1 kHz. The RC filter, which has a roll-off frequency of 500 Hz, filters the harmonics, providing a sine-wave output.
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This circuit is a motion detection sensor, this circuit uses a light source and detector as a sensor infrared motion detector. Motion sensor using infrared LED and phototransistor. Because it uses light to the sensor sensitivity can be affected by....
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High-efficiency step-down switching regulators for positive voltages are very common, however negative step-down switching regulators (negative voltage in, negative voltage out, common ground) are not as well known, even though they are often needed.....
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A simple solenoid driver uses incandescent lamp filaments as on-indicators to limit power consumption. High magnetic reluctance (opposition to flux) in the coil of an armature-driven device, such as a solenoid or relay, calls for a surge of activation....
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We present a simple and high-throughput microfluidic system for diffusion-based monolayer yeast cell culture monitoring. The technique takes advantage of gas solubility and elasticity of PDMS. Yeast cells are patterned into the micro-cavity array with a....
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This project is currently output two PWM signals but can be extended to many PWM signals very easy. The input to the microcontroller is 100HZ pulses as zero crossing. currently it is build for two channel DAC, the input at port1 and port2 of microcontroller....
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This chapter contains circuit diagrams for several power supplies for pulsed solid state lasers. These include units suitable for driving the popular Hughes ruby and YAG rangefinder laser assemblies as well, one using the flash from a disposable pocket....
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I wanted to add a security/sensor light near the main doorway that would run of 12 volts. You can buy 12 volt PIR sensors, but these are very expensive at over $50 each and designed for security systems. However you can pick up a 240v sensor light for less....
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If you ever wondered how those phone bugs from spy movies work, here is the schematic for your very own. This simple FM transmitter uses a phone line to both power the device and receive the audio signal. Just hook it up to the phone line you want to monitor....
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Darlington phototransistor type light-sensitive switch control circuit application As a result of Darlington type phototransistor do sensitive element, the low light sensitive ..
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The IRPLLNR1 is a high efficiency, high
power factor, non-dimmable electronic ballast
designed for linear fluorescent lamp types.
The design contains an active power factor
correction circuit for universal voltage input
and a ballast control circuit....
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The outputs of all coin counters are summed in a 74LS126 tri-state buffer which is used so that all the counter outputs can be connected to the input....
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TCP based security system using the Ethernet module offered within the contest , an ATmega16L microcontroller , a PIR as a sensor and few other peripheral devices , which is specially targeted for homes and small business owners. I have used through for my....
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This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment..
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As we presented in another article the A3952S integrated circuit ( designed by Allegro MicroSystems ) can be used to design very simple and useful motor driver circuits. In the precedent article was presented a simple bipolar stepper motor driver circuit....
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This is a simple but effective alarm circuit which can reset its self after a time that you select. it has normally open and normally closed triggers which make this circuit very practical. This alarm has normally open and normally closed triggers. It`s on a....
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This is an excellent Hi-Fi Stereo PLL FM Transmitter, the audio source can be the computer, sound card, game consoles, CD, DVD, MP3, stereo mixer for stereo audio signal modulated emission transmission, the board also contains two mic amplifier, with the....
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A camera trigger to capture transient phenomena. I had a Mamiya ZE 35mm camera and Mamiyalite ZE flash unit. Typical for bodies of its time, the only means of remotely triggering the camera was the cable release socket built into its shutter release button.....
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Using a 12-bit-resolution analog-to-digital converter (ADC) does not necessarily mean your system will have 12-bit accuracy. Sometimes, much to the surprise and consternation of engineers, a data-acquisition system will exhibit much lower performance than....
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Since the volume control is after the gain stage, the preamp can be easily overloaded. I tried to limit the input signal by mounting a 470 k resistor in series with the CD input. A voltage divider is formed by this resistor and R107, resulting in a greater....
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An In Circuit Programmer is a very valuable tool. Not only does it allow you to program you AVR's with ease, you can update your program without having to remove the AVR (very use full when working with surface mount devices). Also, an ICP allows you to use....
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If your stereo amplifier does not have an input for a record player, you should use this circuit between your turntable and your amplifier. The output of your turntable follows a gain-bandwidth curve called the RIAA compensation curve. The standard AUX input....
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Normally home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need....
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Circuit shown in Figure 3-2. That is in the original loop reactor governor again a series reactor. Reactor available TV choke on, can also be made: with such. About 3mm high st..
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Hey everyone! This is my first tutorial, but I do have experience with other tutorial making! So I will be fine. As a side note, my camera is not....
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Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal....
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A PC usually requires a plug-in ADC card to process analog signals. However, with the circuitry in Figure 1, a PC can communicate with an 18-bit ADC through its serial port. The port provides both positive and negative power supplies as well as control....