Popular Circuits Page 3
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Many battery powered devices use two AA alkaline cells. Often you will not know when it is time to replace the batteries until the device powered by them....
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The application involves observing the light pulse emerging from a thick specimen after transillumination by a laser pulse. Pulses derived from the laser source are amplified using a Video Amplifier LM733. The reference level is set to 1 V in the comparator....
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Soft power switch for a microcontroller where a momentary switch can turn the circuit on (including microcontroller), and then when the switch is pushed a second time, the microcontroller can shut itself off after performing some clean up. I have the above....
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This is a circuit of phone message flasher, an alternative way to get alarmed when there is an incoming call. When the phone rings, high line voltage will be....
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This schematic uses the 555 timer and the 4017 IC to drive 3 LED, to simulate the trafic lights...
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As mentioned in the chapter about the DAC, this circuit shifts the voltage output range. The following diagram explains it's operation and structure. The circuits outputs are connected to the input pins of the power opamps...
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This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit different needs. The circuit as shown in the diagram....
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After the gas stove ignition, closing switch S, the circuit is in working condition. Phototransistor VT1 by flame before irradiation, low resistance state, the transistor VT2: saturated conduction, VT3 and integrated sheet music collector connected to..
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This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Usually remote control circuits make use of infrared light to transmit control signals. Their use is thus limited to a....
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The latest circuit diagram of the AD2496 is shown here. All modifacations I intended and described in the article about the prototype have been implemented. Additionally I introduced two current compensated chokes for higher EMV immunity. Not that I....
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The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high....
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A Goodman Janitrol 2. 5 ton Standard Air Handler model #ARUF030-00A-1. After troubleshooting, I discovered that the only way to shut the fan off is by turning off the breaker or disconnecting the black wire that leads from the fan to the circuit board. There....
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The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators. The frequencies of both oscillators are....
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An AD8205 can be used to make a high-side current sense with a low side switch. Besides AD8205, an inductive load (solenoid) and a resistive shunt are added in this circuit. The resistive shunt is placed on high-side and the switch is placed on low-side, so....
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A simple bridge rectifier and a 12-V regUlator powers the MOSFET sensing circuit. The unregUlated output of the bridge rectifier operates the drain solenoid via switch S1: The sensor itself is built from two electrodes: one made of copper, -the other....
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This is a four-channel temperature measurmet adapter that works without external power supply. It will suitable for measureing temperature and logging its data with a PC. The circuit diagram is very simple and no adjustment is required, everybody will able....
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Application circuit using 3 stereo digital pots to control volume, balance and fader in 4 speaker configuration and push button interface....
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A use NF, double touch lamp ~ 55 base circuit made of switches. 2ZOV AC by [1-, c:, VDI, vs simple composition of a single power save buck and a half crossing fetters flow regu..
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This is a prototype of the WA4DSY 56KB RF modem. It is intended for use on amateur packet radio networks. The modem generates RF in the 28 to 30 mhz range and requires and linear transverter to convert the signal to a UHF or microwave ham band. The digital....
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The 555 timer produces a rapid series of pulses whenever switch SI is open. These pulses are counted in groups of 16 and converted into binary form by the 7493 and applied to the 74154 (a l-of-16 decoder/demultiplexer) wired so that each of its 16 output....
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A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common components were vacuum tubes (valves), capacitors and resistors.....
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This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the one Led in the other, ensuring, a very good rate of precision, in the measurement of....
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Time is set by potentiometer R2 which provides a range or 1 sec. To 100 seconds with timing capacitor C1 of 100uF. The output at pin 3 is normally low and the relay is held off....
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FET has a very high input impedance (100 Mega ohm in case of JFETs and 104 to 109 Mega Ohm in case of MOSFETs), the major shortcomings of an ordinary transistor i. e. low input impedance with consequent of loading of signal source is eliminated in FET. Hence....
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The two circuits di atas illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to 12 volts. The circuit on the left is a....
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Here`s a design for a simple 1KHz square wave generator using a few components and the LM3909 that is useful for testing audio equipment. The circuit is based from the IC. It is powered from a single 1. 5V battery cell and the maximum amplitude of the output....
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Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (1) employs dual timer NE556 to generate the s....
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Linear Technology introduces a new micropower DC/DC
converter designed to provide high output power from a
single cell or higher input voltage. The LT®1308 features an
onboard switch capable of handling 2A with a voltage drop
of 300mV and operates from....
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Here is the schematic, PC board pattern, and parts placement for a "Fantastic Atom Expander". This circuit produces an "exploding atom" effect using 98 LEDs. # The LEDs can be any colour but blue. For a very interesting effect, make one ring red, the next....
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This Homemade GSM Car Security System super simple circuit design of a GSM car security system really works....
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This particular model speaks in a pleasant female voice at the touch of a button, and if you need to be reminded of something during the day, it has an alarm function to, for example, wake you up from a nap at a prescribed time (via a live rooster alarm....
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Remove the 6 mm screw holding on the lower rear fairing cover. This is the black plastic piece the spark plug protectors are attached to. Do not remove the lower rear fairing covers, only the machine screw. Fabricate "L" brackets from the mending plates to....
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Three op amps Ul, U2, and U3 are connected in the basic instrumentation amplifier configuration. Operating from ± 5 V, pin 8 of each op amp is connected directly to ground and provides the ac performance desired in this application (high bias mode). PI is....
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Hi I am looking to add a simple wet/dry knob to a gssl (actually chameleon labs 7720) for parallel compression. Came across this schematic - it seems....
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This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. (View) The input....
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The two lamp-dimmer circuits differ in that (a) employs a single-time-constant trigger network and (b) uses a double-time-constant trigger circuit that reduces hysteresis effects and thereby extends the effective range of the light-control potentiometer.....
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The power supply used here is a capacitive type, thus no transformer is incorporated making the circuit very compact and fixable in any small corner of the particular premise. The use of LEDs in place of a filament bulb makes the application very....
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An ultrasonic beacon and a ultrasonic receiver is very similar to a beam barrier circuit, the only difference is we don`t sound an alarm when an object breaks the ultrasonic path, but instead we try to locate the ultrasonic beacon by moving the receiver.....
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This circuit uses the 555 timer in the asta-ble or oscillatory mode. The length of time the timer is off is a function of the values of CI, R2, and R3. The potentiometer which controls the amount of "hesitation"..
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18W Audio Amplifier. High Quality very simple unit -- No need for a preamplifier Circuit diagram: Amplifier parts: P1 = 22K Log.Potentiometer...
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Keyboards can be slotted into two categories, at least as far as the manner that the switches are connected is co..
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Figure 1 exhibits the circuit with the muscular stimulator. IC 7555 is actually wired just as one astable multivibrator to build about 80Hz pulses. The particular output involving IC1 is fed to be able to transistor T1, whose emitter is actually further....
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Several years ago, National Semiconductor came up with some very high performance, easy to use audio power amplifier LM3886 circuits. I needed an extra amp so I can bi-amp some of my homemade electrostatic speakers so I tried the LM3886 chip. LM3886....
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This optodetector measures the position of the ball by the amount of light transmitted by the infrared LED. This is a linear signal across the small area of the detector - it is not just "on" and "off". This circuit creates a control signal from the two....
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Using the LM3434 adaptive constant on-time DC/DC buck (step-down) constant current controller can be designed a very simple high power led driver application. The LM3434 provides a constant current for illuminating high power LEDs. The output configuration....
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Electric cars represent the voice circuit principle, when to speak, against sound signal received by a drop in the body into a microphone BM and telecommunications weak number,..
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Creating a 2-bit alu. It has 8 defined functions (the functions are defined by a 3bit code), AND XOR etc, and these functions act on two, 2-bit binary numbers and produce a 2-bit answer. From what I have done so far, I have a decoder that decodes what the....
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Voltage variations and power cuts adversely affect various equip- ment such as TVs, VCRs, music systems and refrigerators. This simple circuit will protect the costly equipment from high as well as low voltages and the voltage surges (when power resumes). It....
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The LM3445 (datasheet) is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with triac dimmers..
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Even the energy storage capacitors in even the smallest disposable camera flash operating from a 1. 5 V AA battery can be deadly under the wrong conditions. Line powered devices - even little ones - may have an added danger of high power at high voltage AND....
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This document tells about one of my experiments with semiconductor laser modules. I bought one semiconductor laser for all kinds of experiments. This TIM202 module is a small (38x14x14 mm) semiconductor laser module, similar to those types used in laser....
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The following circuit is six LED stereo VU display diagram which build using Dot/Bar Display Driver IC LM3915. This VU disply should be connected before amplifier module circuit. You may connect this circuit at pre-amp output, tone control input/output or....
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The old common-base audio preamp, having a noise figure of 5dB is an obvious target to improve the noise figure. A common-emitter configuration, with shunt feedback gives 50 ohms input resistance (preferred by the mixer) and a 2dB noise figure. Two....
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When troubleshooting the 12v electrical system of an automobile, its nice to possess an easy voltage indicator tool rather than a voltmeter. This electronic circuit, is powered by 2 AA or perhaps 2 N cells, which can offer enough energy for years of service.....
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This is a schematic diagram of Permanent Magnet Motor Control circuit. This circuit is used to control the permanent magnet control. This circuit uses...
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Magnetic reconnection refers to the local breaking of magnetic field lines and subsequent change in the global topology of the magnetic field in the presence of plasmas or conducting fluids. During this process, magnetic field lines of opposite polarity are....
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problem is my MOSFET gets realy hot. due to the circuit is using half bridge and no mosfet driver. I cannot get the tc4429 ic where i live. any other ideas how i can stop my MOSFET over heating, or maybe how to conect another mosfet driver. Probably wouldn`t....
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In interfacing AC loads, isolation is very important. This because an interfaced circuit that do not isolates the computer from the AC load have chances that the computer will be so much affected if ever the interfaced circuit will fail or be destroyed.....
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Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738. Operation of the remote control is acknowledged by a tone from....
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EMR 4 0 with a single power supply (6V ~ 10V) power supply, power supply when 9V best. It requires better power filtering, noise lower opening the lc no signal input quiescent ..
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Electronic Schematics collections where they discuss about electronic circuits schematics, printed circuit board diagrams and electronics projects ..
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As the figure 14-41 shows, the multivibrator is composed of the 555 and some capacitance resistance components, the oscillation frequency depends on the values of Ra, R16 and C3. f=1.44/(Ra+2R16)C3, the Ra of the formula corresponds to the different values....
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Because all of the resistance values are equal, so the Cantonese OP amplifier 4 magnification number (A) is equal to l, but according to need, by selecting small exposed the ug..
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The our best 12 Volt battery charger circuit, this is a charger circuit automatic system, then when the battery voltage is lower than specified, this circuit....
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In most of the industrial processes it is required to rotate DC (or AC) motor forward and reverse for desired time. First motor rotates forward (clockwise) for some time (say 2 3 min) then it stops for some time. Again it rotates reverse (anticlockwise) for....
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Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the good old 555 IC is used in a way many of you may never have seen before alternately mono-stable / astable....
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Here is a very simple telephone broadcaster transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives....
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This PIC16F877 microcontroller tutorial answers the question, "" How to implement a up down counter using PIC16F877 ? "" Using PIC16 simulator (Proteus) you....
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The circuit is a good battery. It is Control Volttage regulator Output 12V 1.5A , Input Voltage battery 5V-13V Only. Use IC- MC34063 so easy circuit,....
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The features available via the keypad are mentioned in the Spectrum128 Introduction Manual that was included with every machine sold. The service manual for the Spectrum128 is aimed at repair technicians and describes the circuitry and communications....
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Circuit CREATOR Electronics CAE System provides the most complete and high performance solution for electronics design using personal computers...
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Double-tone Police sound
Single-tone old ambulance sound This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the....
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The MC33411 900 MHz Analog Cordless Phone Baseband system is designed to fit the requirements of a 900 MHz Analog cordless telephone system. Included are three PLLs (PhaseLocked Loops). Two are intended for use with external VCOs and 64/65 or 128/129 dual....
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Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate na....
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This achievement shows that it is possible to create a balanced dynamic microphone preamp, it is relatively simple. This preamp is particularly suitable for microphones with an output impedance of 200 ohms to 600 ohms. The advantage of the preamplifier. ..
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The electronic device feel the proximity which measures the user fast. But the distance that most proximity sensors survey is relatively short on the market at present, 1~10cm generally, and infrared rays LED whether multipulse mode for a long time launch....
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The hardware configuration when using multiple 1-Wire temperature sensors like the DS1820 is very simple, as illustrated in the block diagram below. A single-wire bus is used for communication between the microcontroller and the temperature sensor. It is....
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There are several ways to convert an AC voltage at a wall receptacle into the DC voltage required by a microcontroller. Traditionally, this has been done w....
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Applying voltage to the circuit triggers SCR1. With SCRl on, the voltage on the anode of SCR2 rises until SCR2 triggers to commu-tate SCRl. The voltage on the gate of SCRl will swing negative at this time, and only after a positive potential of 0 volt is....
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The Visual Target Tracking System (VTTS) is a system for visually tracking targets using a gimbal mounted camera and digital control circuitry. A small black and white camera is mounted on a stand that can be moved with two directions of freedom. When an....
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For C3, the 100pF across R2. The circuit does exactly the same thing, once again with no explanation. Apparently the utility ought to be obvious, but I`m new to earnest analog electronics. I can only assume that it`s stabilizing something, but I don`tknow....
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Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes....