Popular Circuits Page 95
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LCD (Liquid Crystal Display) is an electronic display which is commonly usednowadaysin applications such as calculators, laptops, tablets, mobile phones etc. 16G—2 character LCD module is a very basic module which is commonly used by electronic hobbyists and....
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The circuit is capable of providing power for portable Geiger counters, dosimeter chargers, high resistance meters, etc. The 555 timer IC is used in its multivibrator mode, the frequency adjusted to optimize the transformer characteristics. When the output....
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Sometimes you want everything in the program to stop while a given condition is true. You can do this using a while loop. This example shows how to use a while loop to calibrate the value of an analog sensor. In the main loop, the sketch below reads the....
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FM Radio has a long history to its credit starting from its development in 1933. Today, FM Radio is an integral part of almost all mobile phones. In a common mobile phone, the cable to the earphone serves as the Antenna for FM reception, wherein the Antenna....
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load....
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Buffers belong in a subset of amplifiers, in general. In addition, power buffers can be thought of as belonging to a subset of power amplifiers, in specific. (Isn`t taxonomy fun ) The uniting features for all buffers are unity gain and a low impedance output....
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555 Negative Voltage Power Supply Circuit A negative supply can be generated by a ""Charge-Pump"" circuit created with a 555, diodes and....
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When the turn signal switch SI is closed, lamp #1 will be activated and capacitor Cl will charge to the triggered voltage of Ql. As soon as the anode voltage on Ql exceeds its gate voltage by 0 V, Ql will switch into the low resistance mode, thereby....
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A wide range of 7 ~ 40V turn 5VDC-DC step-down circuit is as follows: ..
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A simple and cheap automatic night light circuit desingned based on timer IC NE555 that extinguishes after a preset time. This time can be adjusted too....
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A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps...
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A simple two-transistor inverter circuit has been built for this experiment. The transformer shown in Fig. 1 is the inverter transformer. The inverter output voltage is in the form of pulses with an estimated peak value of about 700V. When a Fluorescent lamp....
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To activate the air muscle, valve labeled #2 is opened. This causes the air muscle to contract. Once activated the #2 valve may be closed without impacting on the state of the air muscle. The air muscle stays in a contracted state. To relax the air muscle,....
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Power Saving Using Time Operated Electrical Appliance Controlling System is a reliable circuit that takes over the task of switch on/off the electrical devices with respect to time. This project replaces the Manual Switching. It has an Inbuilt Real Time....
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Emitter-coupled differential amplifier (1) emitter-coupled differential amplifier circuit in the base of the differential amplifier circuit is by symmetry of the circuit to sup..
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Charging circuit from the DC power supply switching power supply control ..
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In this card there is a constant current source is used to activate the phone. The LM339 is used to detect out of hand and the hand of the condition. There are circuits repeat the same because we have the phone interface 8. When the phone on hand in the....
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This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value of 22 for resistor R1 causes an average current of about 65 mA through infrared emitter D1. Because the IRED is....
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Electronic Table (1) Introduction This schematic circuit having two alarm output by the timer by thyristor controlled. Can any on/off, and shut down after the power supply from..
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To control a stepper motor, you have to energize each winding individually in a specific and timed order. The energizing is accomplished by a driver circuit (an amplifier). The timing is performed by an indexer circuit and the objective (go forward, go....
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Here is very simple circuit in which the LED becomes ON only after a preset time the power supply is switched ON. When the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is....
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This sensitive touch potentiometer is based on IC1 (CA3130), one operational amplifier with a high input impedance. When the finger touches Se1 sensor, C2....
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The circuit diagram of the filter section is shown in Figure 1. It is a completely conventional filter, and the component designations are the same as for the 24dB unit described in Project 09. It is designed primarily for 2-way electronically crossed over....
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In this Project we have designed an embedded system which is used for tracking and positioning of any vehicle by using Global Positioning System (GPS) and Global system for mobile communication (GSM). When the request by user is sent to the number at the....
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Sun tracking systems are very effective in increasing the efficiency of photovoltaic (PV) arrays, and are essential for concentration PV systems. The following paper discusses a light tracking servo model which has been built to simulate the movement of a PV....
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This PIC software combines frequency counter and frequency lock functions. By adding couple of transistors and operation amplifier TL082, it is possible to lock the LC oscillator frequency. Frequency reference is formed from the measured frequency itself....
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This regulated power supply was built as a simplified outboard version of a PSU in my first phono stage. Replacing hexfreds with tube rectifier eliminates the need for power-on sequencing. Chassis (salvaged from a hospital laser PSU) size is 180W*240D*100H....
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300B is a high reliability, excellent characteristics of the power amplifier transistor 6 in the circuit should be designed so that the 300B excellent characteristics of the fu..
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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The Arduino Internet Gizmo is a USB, Arduino, and RFID device for web surfing. The gizmo works by placing an RFID tag on the top of the gizmo. The gizmo reads the RFID tag and sends the tag number via USB to a program running on a PC. The program looks up....
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Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In....
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A TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting. A 15-V zener, Dlf provides the dc reference for operational amplifier Ul, whose....
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This is a circuit of Frequency Doubler using 4011. This circuit uses one CMOS quad, two input NAND gate package type 4011. This circuit consist of two...
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A simple battery charger that disconnects the battery when charge voltage reaches its nominal voltage and reconnects when battery voltage falls below a predefined level, can be designed using this circuit diagram. A fraction of the battery voltage is taken....
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With hv insulation inside ie polystyrene. If you put ferrite in it could be a way to reduce the frequency. But radiant energy won`t like copper. It`ll create a short. Just an opinion, I`ve not experimented with it - except I know ordinary cable won`t work.....
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A charge amplifier is an amplifier whose equivalent input impedance is a capacitive reactance that is very high at low frequencies. Thus contrary to what its name may suggest, a charge amplifier does not amplify the electric charge present at its input. Its....
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Controller for brushless
and sensorless motors, with active rpm control # Active rpm control
# Car mode
# Proportional brake
# Active freeweehling
# Updates via Internet available..
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When power is first applied to the circuit, 02 begins to charge via LED1, R3, and R4. When the voltage across C2 reaches Ul`s input trigger level, the output of Ul at pin 6 goes positive for a period that is determined by the values of and it! r That turns....
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The balloon went to 103, 258 ft peak reported altitude. Many items had to be considered for launching payload to this range. Unlike building an electronics package to operate at Sea Level, items such as air pressure, temperature, relative humidity and even....
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The voltage measurement is very general in electron technology at present, accuracy requirement and functional requirement for the instrument are higher and higher, especially under the situation that the signal power to be measured is with maximal phase....
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A 2N366 is configured as an audio feedback oscillator using an audio transformer is shown. Adjust R1 for proper operation and desired audio note....
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Core device is a circuit pyroelectric infrared sensor BH, when it felt the trace infrared body issued a sensor inside the element will obviously feel that their process of chan..
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The device generates an adjustable frequency of low to medium powered IR pulses of invisible energy and must be treated with care. The portable battery pack is stepped up to 200 to 300 volts by the inverter circuit consisting of Ql, Q2, and Tl. Ql conducts....
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
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The primary advantage of this circuit, when compared to other comparators, is its ability to latch after the input has reached a predetermined threshold level. When the input exceeds the threshold level, the LM311N output increases. This transition enables....
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The new design of a tutorial board based on the popular PIC16F84A microcontroller. Have a features eight single leds, an LCD display and five push ....
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This circuit accepts bipolar control inputs of ± 5 V and provides a phase-chopped output to a dc load (such as a servo motor) of the same polarity as the input. The rms voltage of the output is closely proportional to the control input voltage. N-channel....
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Intercom walkie talkie are the next logical step in this discussion. They show how a crystal oscillator can be used to transmit voice. Transmitting a voice via a crystal locked oscillator is not easy. This is because the crystal is locking the frequency and....
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This VFO circuit covers from 2.13 to 2.58 MHz and is intended for use with an external mixer to heterodyne the signal to desired..
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Circuit operation principle of the device shown in Figure 11. Power outages are frequent thing, but some occasions, the power does not allow (such as the ongoing surgery, etc.)..
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The high-pressure direct current power supply has been already increasingly extensive. The method that this literary grace outputs in parallel with the power of double-channel gets the direct current of the low ripple. Today when the gas switching tube....
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The first part of this paper describes the high dynamic range CMOS (HDRC ®) imager a special type of CMOS image sensor with logarithmic response. The powerful property of a high dynamic range (HDR) image acquisition is detailed by mathematical definition and....
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I`m using H-bridge with IRF740 (MOSFET) to convert 315VDC to 230VAC. But the upper mosfets are frequently get damage within few seconds. I can`t find....
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An LT1172 generates positive and negative voltages from a 5-V input. The LT1172 is configure..
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One of the most popular electronic IC number. There are many different symbols depending on the firm and ability to meet such as 74HC47, 74HCT47, 74LS47, . This is a sign dedicated decoder IC for LED 7-segment common anode. Application when it needs to....
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The next counter section works the same way but is set up to count 4 quarters, single $1 (loonies) and single $2 (toonies). The toonies circuit is set....
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The circuit described here was designed as an addition to a remotely controlled garage door opener. The problem was that a brief burst of interference, arising from a thunderstorm or a mains spike, was enough to trigger the mechanism, and the author found....
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3P10 circuit shown in FIG. It uses a bidirectional thyristor control. Adjustment potentiometer RPi, can change the minimum motor speed f adjustment RP2, continuously changing t..
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This EEPROM programmer reads, writes and erases 24C EEPROM devices. It has a PC serial port interface. The programmer needs 5VDC power supply. It can read or write one page (16 bytes) at a time by programming the page with a terminal program such as....
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This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low....
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The following circuit shows about Simple Moisture Detector Circuit Diagram. This circuit based on the 4093 IC. Features: when a certain moisture ....
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I`m trying to get an ignition coil to create sparks running it with a Mosfet powered by a 555 timer. The Mosfet is definitely switching. I checked it....
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This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal. The circuit is....
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555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size....
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Digital display clock signal source circuit shown in the figure is taken from a multi-point detection control box in the actual circuit. It mainly consists of automatic and man..
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An integrated circuit`s response to fast transients on its input supply is often an important measurement to take. If the device under test (DUT) is a micro-power device and doesn`t require an input bypass capacitor, simply drive the power-supply input with....
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CGA to SCART adapter has great advantages as it does not require separate power source and that uses very few external components, which can be easily adapted in the SCART connector. The signals from R, G and B pins of the CGA`s board are converted from TTL....
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A 1995 Ford Escort wagon with a 1. 9 litre engine and 5 speed manual trans. The problem I`m having is that the cooling fan won`t come on by itself when the temp gets high. I`ve had a friend help me test the fan, and when current is put to it directly, it....
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MP4 audio circuitry is shown, it is by the audio D/A converters and audio amplifier combination circuit, which has a body product circuit simple, suitable for use in small MP4 digital machines...
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Here is a simple tachometer circuit for use with a hand-held DVM or portable chart recorder. A novel feature is that the source frequency pulse/rev rate can be directly set on a ten-turn potentiometer to provide a convenient calibration of one V per 1000....
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The four main input channels are identical, have independently adjustable input sensitivity, tone, panning sound. The fifth entry - linear channel. Despite the cheap and primitive, the work Mini Audio Mixer "Impulse MM-04" was quite satisfactory ..
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Using a Signetics NE602 in a varactor-tuned front end, the circuit of a shortwave receiver can be very simple and yet g..
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I found one circuit diagram, on one russian site, freeenergylt dot narod2 dot ru/Aidas.
Question is, diagram contains something pulse generator, for this circuit diagram need PCGU1000 equipment, for functioning the coils?..
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Various embodiments of the BB metal detector have been published, and it has been widely described in the press as a new genre. Instead of using a search and a reference oscillator as with BFO, or Tx and Rx coils as with IB, it uses two transmitters or....
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Going camping nowadays involves demography lots of cyberbanking accessories whether for day to day active or for fun and entertainment. Most of the time a answerable advance acerbic array and a ability inverter would be acclimated to ensure a calmly....
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Here is the circuit diagram of a simple AM transmitter circuit that can transmit your audios to your backyard. This circuit is designed with limited power output to match the FCC regulations and still produces enough amplitude modulation of voice in the....
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Add a cheap stopwatch to this circuit to produce an accurate reaction timer. The circuit is wired in parallel with the start/stop button in the watch via a 2. 5mm socket, which fits snugly in one corner of the casing. The person conducting the test (the....
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In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi s industry-standard HD44780 controller. These displays can be driv....
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The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm....
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NE555 time base circuit with AC solid state relay SSR may constitute automatic light switch circuit, the circuit shown in FIG. From the figure can be seen during the day due to incandescent EL photosensitive resistor circuit automatically fall off when the..
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To operate a small motor used for opening and closing a pair of curtains. DC motor has six basic components: commutator, stator, rotor (a. k. a. , armature), axle, field magnet(s), and brushes. Component: LED, Diode, Resistor, Motor, Transistor. [hampatong.....
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An NE567 tone decoder, tuned to the transceiver"s CW offset frequency, ensures that the transceiver will be tran..
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This is a very-very simple mini audio amplifier circuit. The circuit build based single LM383 with several discrete circuit to support LM383. The circuit capable to deliver about 7W audio output. The circuit could be built on a perf board, universal solder....
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It's a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn....
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Model Railroader is the world`s largest magazine on model trains and model railroad layouts. We feature beginner and advanced help on all model railroading scales, including layout track plans, model railroad product reviews, model train news, and model....
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Transistorised Astable Multivibrator is a cross coupled transistor network capable of producing sharp continuous square wave. It is free running oscillator or simply a regenerative switching circuit using positive feedback. Astable Multivibrator switches....