Popular Circuits Page 206
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This circuit is a small digital ?roulette``. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply....
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The transmitter keyboard is arranged as a scanned matrix. The matrix consists of 7 driver outputs and 7 sense inputs. The driver outputs DRVON to DRV6N are open-drain n-channel transistors and they are conductive in the stand-by mode. The 7 sense inputs....
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To share a regional press like the USB printer, scanner etc. two computers, it is relatively easy. Just connect the two computers on a network device and say the printer as shared. This method however requires the continued operation of the computer we....
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Features voice switches with Figure 2109. From single-junction transistor VT2 and RC components delay the circuit. Adjustment potentiometer RP3 or capacity capacitor C3 can cha..
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The transmission distance can be increased greatly by replacing the transmitter`s red LED with a cheap red laser diode purchased from a $2 Dollar Shop . The circuit design makes a compromise between laser brightness and sound quality and loudness. This is....
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Combined monostable multivibrator 555 and a pair of light control and light control comparator monostable phase. Depending on the time of the circuit can be used to enable load..
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7 segment display driver circuit based on 7446. seven segment display system, 7 segment decoder/ driver . Sinking and sourcing 7 segment display driver...
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Another frequency-determining device is the CRYSTAL. The crystal may be used with a tank circuit, or it may perform alone. Crystals exhibit a characteristic known as the PIEZOELECTRIC EFFECT. The piezoelectric effect is the property of a crystal by which....
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Here is a simple but effective battery charger circuit using IC LM 317. The circuit can be used to charge 12Vlead acid batteries. The circuit is very simple and can be easily assembled on a general purpose PCB. The heart of the circuit is IC LM 317, which is....
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Today we would like to offers solutions for a set time for take control relay and take NO. / NC. contact to apply to control other devices. such as disable or enable the device. function of this circuit is using IC555 to determine the pulse and a resistor R1....
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Stops charging when battery is full charged, Portable unit Charging of the mobile phone, cellphone battery is a big problem while traveling as power suppl....
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Circuit shown in Figure 3-11. It uses a one-way thyristor control. Adjustment potentiometer RP, continuously changing the motor speed. ..
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The schematic is in PDF, and cannot be send to you by this site. Check this site. It has some schematics. Check whether the schematic you need is there. Pull up older posts there. I have a WS-55807 that will not power up. When the power button is pressed I....
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The Excelitas TPS 1T 0134 OAA060 thermopile sensor is a self-contained module with a built-in op amp. (We use the A2TPMI 334 OAA 60 designation in this document because that was the PerkinElmer part number when we purchased them. Since then, PerkinElmer`s....
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Competition is ~ relay contacts contactor control systems often encounter problems, too much trouble to deal with, and sometimes need to add a lot of elements to add. However, if the use of negative temperature coefficient thermistor (NTC) delay switching..
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A few nice midi controller interfaces I found. The Knee(Audio)Pads are a wearable MIDI...
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Atmega 128 is like other AVR microcontrollers. They are ISP is in-system programmable. Earlier I wrote an article about AVR ISP programmer where 74HC244 buffer is used. Using buffer is safer for your AVR. But what if you need 128 atmega programmer without....
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When we are driving sometimes we do not know the speed of our car, especially when we are in the course of the highway so nice and straight, if the cars speed is too fast or faster than anyone could lead to accidents that do not want to happen. The circuit....
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This project uses the 1.2v rechargeable battery and solar panel from a Solar Garden Light. These lights can be bought for less than $5.00 in most $2.00 shops or similar shops that sell general household items.
We are also using the housing for this project....
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Air compressor control circuit, the circuit principle analysis of pumping at play: When the overload protection function (1) When the motor thermal relay FR long-term overload,..
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The circuit shown will switch on and off a resistive or inductive load up to 800VA with the possibility to adjust both the on and off period. Switching takes place during the zero crossing of the sine wave. The switch on point is around the zero crossing but....
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With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room. Here a counter IC 7490 is used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and....
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Infrared transmitter and receiver circuit shown in the schematic diagram below can be used as remote control. The transmitter is basically an oscillator circuit, and the frequency can be adjusted using R1 potentiometer (or trimmer pot). This oscillation....
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This is a circuit for high quality power supply with a continuously variable stabilized output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a....
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This article describes the Flip-Flop Flashers, Buzzers CIRCUIT (2N4401). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and....
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Attach a 12V fan to this circuit which draws 70mA (0. 007A), so the circuit must have at least that much current. Yes, there is something missing in the analysis. Actually there is too much in the analysis. The voltage drop across the resistor will be simply....
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If you need more sensitivity, use 74AC04 or 74HC04 instead of 74HCU04 as U1. It may be better than 74HCU04, but the frequency response of 74HC04 may be worse...
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Design a circuit in which a microcontroller produces a signal and then using an amplifier drives an 8ohm speaker. I`ve so far used LM386, but it cannot go above 1W, which turned out to be insufficient. Besides that, I wish to add an (second order) anti....
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Without the specified delay the circuit could malfunction or even get damaged. A capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see thatit`s been placed at the other end of the base resistor and not....
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A sawtooth wave generator circuit using a 555 IC is given in the article below.Frequency equation is given with the supply voltage Vcc....
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The receiver is built on a single-sided printed circuit board which measures 2 by 4. 3 inches. The small size means that the board can be fitted into a wide variety of enclosures, which should be well screened. The main directional signal is picked up by a....
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This charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If....
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Even though today`s electrical appliances are increasingly often self-powered, especially the portable ones you carry around when camping or holidaying in summer, you do still sometimes need a source of 230 V AC - and while we`re about it, why not at a....
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This radio modem is popular for amateur radio packet application. This radio modem is powered by the data and control lines, so it need no additional power...
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A very useful, easy and interesting project of a flip flop relay circuit using a 555 IC. The circuit will continously flip flop or on and off two relays one by one. ....
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As transformer a toroidal transformer (2x12V 15VA) is used, because this gives much less energy losses then an E-I core transformer as used in the original mains adaptor (for more info, click here )...
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This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer`s parallel port. With a stepper motor you can build a lot of interesting gadgets such as robots, elevator, PCB drilling....
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This circuit made from an infrared phototransistor and infrared LED. This transducer works with the principle of light reflection, in this case the light is infrared. The skin is used as a reflective surface for infrared light. The density of blood in the....
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With this simple project, you can have balanced lines too, simply adapting the unbalanced inputs and outputs of your hi-fi gear to become balanced, and then back to unbalanced at the other end. You can even be extra cunning, and power the remote converter....
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A simple direct coupled radio circuit diagram and schematic, ideal for adjacent stations.This circuit uses Q1 as audio amplifier and base emitter capacitance provides radio filtering....
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Professional schematic capture and PCB design software with automatic component placement, track routing and design validation. Includes full feature schematic capture environment...
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Monolithic/Hybrid Digital to Analog Converters using MC 1408IC,SE/NE 5018, Specifications and Applications....
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This circuit uses only one JC, either 1, LM393 dual comparator or 1/z, LM339 quad comparator. RV1 and RV3 set the full scale reference voltage, and RV2 and RV4 set the switching thresholds to a value between 0 V and the full-scale reference. ..
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This simple amplifier does sound good quality Power output about 10 - 14 Watts with Supply voltage about 34 - 36 Volt DC. It requires a preamp in the function of it hasn`t got much advance. It requires cumbersome heat up sinks and a great transformer and a....
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Relay K1 has a low-impedance coil and K2 has a high-impedance coil. When a sensor opens, current is routed throu..
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Continuous monitoring of the mains voltage is required in many applications such as manual voltage stabilisers and motor pumps. An analogue voltmeter, though cheap, has many disadvantages as it has moving parts and is sensitive to vibrations. The solidstate....
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Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test clips. The output from the oscillator is then rectified by the 1N4148 signal diode and filtered by....
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Any idea where can I get the schematics for the dome light dimmer to be used in car. Which means that when I open the door, the light will light up and when closed, the light will slower dim and off. Thank you for the reply, how would I connect the circuit....
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A very simple split power supply circuit project can be designed using this schematic diagram which is based on a LM380 audio power IC. The regulation of the output voltage depends of the upon circuit feeding the LM380. The power dissipation is around 1 watt....
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Here are two photos of the interior of the NSN6054A. The two metal brackets that hold the circuit board in place also function as heat sinks for the 12 watt audio amplifier...
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Electronics Circuits Reference Archive Audio preamplifier circuits There are thousands of pre-amplifier circuits. These are three which have interested me and are a little different. Intercom preamp A very convenient way of making an interc....
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The circuit turns on a light corresponding to the first of several buttons pressed in a "Who`s First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps....
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Output transformer core: coming from flea market, light blue color, marked as A-438281-2-9H9-3, OD = 47 mm, ID = 24 mm, height = 13 mm. No information about µ Mosfet to be used: coming from flea market, with the following characteristics. It`s an obsolete....
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The great network of telegraph wires that once enfolded the nation like a cobweb has vanished just as surely as the spider`s handiwork is erased by a sudden sweep of the broom. " Please note that the information below is obsolete. Dial-up Morse is no longer....
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A discussion of the Williamson Amplifier should be first preceded by an overview of its context in the evolution of the vacuum tube and its application to high fidelity audio reproduction. Transformer coupling was widely used pre-war because it was simple....
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A while ago I was doing some fairly trivial repairs on a Philips portable radio/CD/cassette player. It had a sticker on it claiming that this particular product features something called Dynamic Bass Boost. From the outside this means an extra switch, that....
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The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable multivib-rator generating ring signals. These ring....
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The alarm may be used for a variety of applications, such as frost monitor, room temperature monitor, and so on. In the quiescent state, the circuit draws a current of only a few microamperes, so that, in theory at least, a 9 V dry battery (PP3, 6AM6,....
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In this arrange ment a high value inductor or choke L is connected in series with the rectifier element and the load, as illustrated in figure. The filtering action of an inductor filter de pends upon its property of opposing any change in the current....
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The internal mute circuit and pre-set gain resistors provide for a very economical design solution. Output power specifications at both 20V and 24V supplies and low external component count offer high value to consumer electronic manufacturers for stereo TV....
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This circuit shows a simple way to add text information to a composite-video signal that might be floating at some indeterminate de level. The text generator and composite-video source must have the same sync signal. The video-input and -output signals....
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The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated....
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With an integrated voltage regulator connected reverse to a mini drill can be adjusted speed within certain limits so that it remain constant, independently of load. In the scheme presented below the electronic speed control is made by a voltage regulator,....
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Manufacturers are starting to turn to new high power to provide a photoflash function for these low-light conditions called white-light LEDs. These LEDs output....
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The ADF4107 Frequency Synthesizer CAN be used to implemen local Oscillators in the upconversion and downconversion sections of Wireless receivers and transmitters. It consists of a low noise digital PFD (phase frequency detector), a precision Charge Pump....
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This is a schematic diagram of stereo audio amplifier for your car. The circuit is powered by a single IC TDA1553 with some external components, this IC will handle your stereo car audio system. The TDA1553CQ is a monolithic integrated class-B output....
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The circuit illustrated produces a clean sine wave signal ideal for audio testing, or wherever a good-quality sine voltage source is required. It uses one integrated circuit which is a widely-available dual operational amplifier, the Texas Instruments....
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Driver circuit diagram: The main function of the driving circuit is variable width pulse width controller output power amplifier, as a drive signal to high voltage power switch..
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Drawing, potentiometer RP for adjusting the operating voltage of the relay KA, ensure that the motor work normally when E KA does not operate reliably action phase failure occu..
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Many modern circuits tend to work from a single supply voltage of 3V. But often they need a virtual earth at half the supply voltage for efficient operation. The splitter shown in the diagram bisects the supply voltage with a high-resistance potential....
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The TRW-24G connector pins is too small (~1mm pin to pin). For that I order the adaptor PCB that is convert the small connector of RF module, to standard pin connector. The pin order of RF modules in schematic diagram is based on pin order of pin adaptor,....
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In 1991, I was very interested on this display but I can`t find one in the town and expensive to import from abroad. But now, it`s everywhere and I can say that this technology is obsolete since the colorful TFT display is easy to find and cheap. The mcu is....
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MINIATURE ISOLATED AC/DC POWER SUPPLY. This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately...
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This is the circuit diagram of a simple electronic combination lock using IC LS 7220. This circuit can be used to activate a relay for controlling (on & off) any device when a preset combination of 4 digits are pressed. The circuit can be operated from 5V to....
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This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid....
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So far the idea has been to show you how the Arduino Uno board and its Atmel ATMEGA328P microcontroller can interact fairly simply with the outside world. This time we`re simplifying the electronics but ratcheting up the demands on the microcontroller by....
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The IRISMPS5 is an open frame 90W Flyback power supply unit (psu) using the IRIS4015 Integrated switcher. This demo board aims to show the capability of the IRIS4015 to handle the upper level of flyback topology power range, without the strict standby power....
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Operation is from a 12v or similar supply, and R1 can be changed if necessary for higher voltages. In this and similar circuits there is considerable latitude in the choice of values for positions such as C1. At B VR1 is a top cut control, and VR2 the volume....
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This is a very simple liquid detector that use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use any...
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This circuit detects when a tube is empty and pulses a piezo buzzer in. 5 second intervals. I have it working with 5v on a breadboard, but I need to move it to 12v from a wall wart. Secondly, with 12v R1 should be 220 1W, but I want to stick with 1/4W....
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This site contains complete schematics and code for a 68HC11 based frequency counter, square wave synthesizer, sine wave synthesizer, programmable filter, capacitance and inductance meter, with a digitalker speech synthesizer output. Project specifications....
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Some applications require a circuit to indicate that a battery`s voltage has fallen below a certain value. However, if you don`t frequently check the indicator, the low-battery indicator itself can easily discharge the battery. The circuit in Figure 1....
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A higher end version of the same thing, with a few extra user selectable settings to allow audible as well as ultrasonic output so it can be more effective against animals:..
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When the water boils, it is not only the police, but also cut off the heater power. Temperature sensing element with a fluorescent neon light bulb restructuring within the starter...
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This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo. It has two pushbuttons, CENTRE and SWEEP and a potentiometer which works as follows: CENTRE Does exactly that, centers the servo, afterwards the....
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Hey guys I`ve been researching a ""mystery circuit"" and I can`t figure out what its name is. It`s driving me crazy!!!! Please HELP ME!!! Thanx....
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This circuit is based upon the change of frequency of the function generator with the input voltage ViN· Generally, the frequency depends upon the capacitance and resistor connected to pin 6. This resistor is replaced by the FET. ..
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Hysteresis in lamp dimmer or in other electric appliance might cause some trouble if you need a fine tuning, something like out of control. This is a circuit of...
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AM radio shows monolithic circuit. The broadcast signal received by the antenna foot iciCD fed by a high efficiency mixer, the output from IF, IF transformer after filtering, a..
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During nighttime, when no light falls on LDR1, it offers a high resistance at the base junction of transistor T1. So the bias is greatly reduced and T1 doesn`t conduct. Effectively, this removes the common terminal of IC1 from ground and it directs the full....