Popular Circuits Page 110
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This simple light intensity meter circuit can be used to determine the intensity of light in a wide variety of electronic projects and experiments....
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This circuit designs for modify power supply input 12V from battery or the other. Have the level voltage be down be left 9V be stable or , 9V at 2 Amp....
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AFX slot car sets are very enjoyable but you can increase the fun with a lap counter. This circuit will count from 00 to 99, with independent counters for each track. The sensing device used is a Hall effect sensor (UGN3503; available from Dick Smith....
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By setting the 500 ohm resistor to adjust the circuit, the resistor is part of a fully charged battery. ..
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I have a small solar panel for maintaining my 12V car battery. (Circuit below.) The panel supplies about 75mA to the battery in full sunlight. I want to avoid wastin....
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Here is a simple SWR protection circuit you can easily build. The directional coupler and detector components are from an old VHF SWR meter. You may want to replace the meter`s existing RF bypass Capacitors with higher quality (mica) ones. You may also want....
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
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The timer is triggered on the zero crossing voltage pulse. The time constant is determined by C5/R14+R15 that is used to determine the conduction angle. The T2 T3 inhibits the power switch until the auxiliary supply voltage reaches 8V to guarantee that the....
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This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker output of your audio amplifier.....
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This is a rather sensitive circuit which will detect minute variations of a magnetic field, particularly the Earth magnetic field. The principle is based on an audio beat tone generated by two identical oscillators. These must be built in the same manner....
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Using LM833 can be designed a very simple tone control circuit using few external components. For this Lm833 ton control circuit can be used almost any type of operational amplifier if it have high input impedance. The LM833 is a is a dual general purpose....
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A dancing light can be easily constructed using a 555 timer wired in astable mode. Please read the article Astable Multivibrator using 555 Timer before continuing. This circuit blinks two LEDsalternativelywith some delay and it can be easily modified to....
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Safety devices like fuses provide protection against excess current, but do nothing for transients and short duration spikes of high voltahe on the power supply lines.This circuit uses the "crowbar" method and provides fast protection against transient....
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As shown for the basic connection circuit ISO107 signal and power supply. Each power supply terminal must have a bypass filter. When isolated power supply output current is gre..
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The SN74AVCA406E is a transceiver for interfacing Microprocessors with MultiMediaCards (MMCs), secure digital (SD) cards, and Memory Stick compliant products. By Texas Instruments ..
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The circuit is build around an stable multivibrator using NE 555. Here the output at pin 3 remains high for a time period set by R2, and low for a time period set by R3. The low output pulse drives the transistor pair to drive the wiper motor to make one....
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A practical 92% efficient LCD backlight design is a classic
study of compromise in a transduced electronic system.
Every aspect of the design is interrelated, and the physical
embodiment is an integral part of the electrical circuit. The
choice and....
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This nonlinear, passive filter circuit rejects ripple (or unwanted but fairly steady-voltage) without appreciably affecting the rise time of a signal. The circuit works best when the signal level is considerably lower than the unwanted ripple, provided the....
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A while ago, as my first microcontroller project, I made a Pong game on a 5G—7 LED display, but then nothing became of it. Recently I was given a hard hat as part of a uniform (for an engineering competition) and told to customize it, and remembered pong.....
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The circuit has a frequency response ranging from 100Hz to 3 MHz; gain is about 30 dB. Field-effect transistor Q1 is configured in the common-source self-biased mode. Optional resistor R1 allows you to set the input impedance to any desired value;....
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Glitch has been a universal slang expression among electronics people for an unwanted transient condition. In D/A converters, th..
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Production of high-quality wireless microphone is the desire of many readers, but amateur ..
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The Hot Springs tanks and circuit board should be mounted in a location that is free of ambient electro-magnetic fields. The input and output jacks are typically placed on a patch panel with other effect`s inputs and outputs. In use, the effects or aux send....
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IR illuminator for night-vision tv cameras and scopes. This source uses LEDs and an astable oscillator to control the switch, duty-cycle, and effective IR illumination output..
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This button, with a few hacks, now makes it so we can open up our office with our Nexus Ones, iPhones or even SMS. Located near the reception desk, this button opens an electronic latch on the front door. Pulling the assembly out of the wall revealed the....
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This amplifier delivers 20 W into an 8-D load using a single IRF520 driving a transformer coupled output stage. This circuit is similar to the audio output stage used in many inexpensive radios and phonographs. ..
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As shown in FIG constitute grounds RF2132 linear power amplifier circuit. Radio frequency (RF) signal from the input pin 3, via a preamplifier, after the last stage power ampli..
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The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way....
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1832 for bridge measurements, the external circuit is very simple, as shown in FIG. Belly adjust sensor bridge drive voltage ( feet), the adjustment range is +4 a + 10V, based ..
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This is a circuit of FETVM-FET Volmeter. The function of the VTVM is replaced by the FTEVM while at the same time ridding the usual line cord instrument. This....
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The LM383 is an audio-power amplifier that is capable of producing up to 8 W of audio output. R1 is essentially a load resistor for the hand-held transceiver"s audio output. R2 can be composed of two fixed resistors in a 10:1 divider arrangement, but using....
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This circuit offers 10- to 15-dB gain from 400 to 850 MHz and is therefore eminently suitable for situations where th..
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A relay-based on/off controller on the other hand can be very efficient. A typical relay has a contact resistance of 3 milliOhm. At 20A, this translates to a voltage drop of 0.06 volts, with a power loss of 1.2W. The relay itself typically consumes around....
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This is the figure of4Q2 DC Motor Speed Controller Circuit Block Diagramwhich is designed for full control of conventional shunt wound and permanent magnet motors up to 75kW capacity, according to the datasheet. This type ofDC motor speed controlleris....
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Voltage inverter circuit design electronic project using few electronic components..
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The OP07 is in a non inverting amplifier so as not load the mV of thermocouple, the zeners are to protect circuit if junction contacts heaters or the earth gets broken. The RC is to filter out 50Hz pick up in thermocouple wires if near heater wiring and also....
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The Philco radio is a nine tube superheterodyne reciever combining standard broadcast, police and airplane reception and employs the high efficiency 6.3 volt filament tubes, automatic volume control, bass compensating tone control, shadow tuning and push....
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For the use of direct current 6 ~ 8W fluorescent lamp ignition circuit ring. It is a common emitted by a pole blocking..
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Once power has been applied to the circuit, the Red LEDs should all be flashing on and off together. The Yellow LEDs should be flashing on and off, but only every other Yellow LED should be on at one time. The Green LEDs will stay on at all times. The flash....
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Function generator ranging from 0.1 Hz to 20 MHz can be easily built using MAX038 integrated circuit chip. Here is the most simple implementation of high ...
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This single transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most o....
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hi, I have 2 stepper motors to be controlled by dspic. I have programmed the pic. Im confused in usng L298 s. Can someone help me with a circuit....
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current....
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This circuit provides a simple, low-cost crosshatch generator tor convergence and geometry adJUStments on color TVs. The generator is driven by two clocks, one for the horizontal drive, IC1ab, and one for the vertical drive, IC2ab. The clock outputs are....
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The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery-powered lantern or flashlight or to a custom design. For the car it makes a great lamp for changing a flat tire, back seat reading or emergency engine....
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Construction and programming PICAXE solar panel battery charge controller....
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The 32-kHz low-power clock oscillator offers numerous advantages over conventional oscillator circuits based on a CMOS inverter. Such inverter circuits present problems, for example, supply currents fluctuate widely over a 3V to 6V supply range, while....
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A very simple 16 volt switching power supply electronic circuit can be constructed using this circuit diagram that is based on the MAX668 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controller that is designed for a wide range of....
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The description of this circuit is rather simple. The RTS line of the serial port gives power to the voltage regulator which fixes it to 5 stable volts. A diode is there to protect the serial port from inverse current. The capacitor helps to keep a stable....
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This low-voltage high-current output, sWitching de power supply is running off the 220-Vac input. In this circuit, an ST2 diac relaxation oscillator, Q3, Cl, and the diac, initiates conduction of the output switching transistor Ql, the on-time of which is....
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A shows a twin-T network connected to an LM102 to form a high Q, 60 Hz notch filter. The junction of R3 and C3, which is normally connected to ground, is bootstrapped to the output of the follower..
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The Q meter has been an essential piece of equipment for laboratories engaged in the testing of radio frequency circuits. In modem laboratories, the Q meter has been largely replaced by more exotic (and more expensive) impedance measuring devices and today,....
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AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components. The MC33374 IC is a monolithic high voltage power....
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The Spartan-3an board has external stepper motor interfacing, indicated as in Figure. Stepper Motor is driven by ULN2803A. It is a high-voltage, high-current Darlington transistor array. ULN2803 is used as a driver for port I/O lines, drivers output....
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The metal detector is composed of the probe oscillator, reference oscillator and audio amplifier and other components, and the circuit is shown as the chart. Probe oscillator consists of transistors VI, V2 and detection coil L1, capacitor C1 and so on.....
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When power is applied to the circuit, the heater coil in the sensor is energized by the 5-V output of IC5, a 7805 voltage regulator. Breathing into the sensor with alcohol on your breath will lower the sensor"s resistance; consequently, the input voltage....
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This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched....
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An amplifier to go with an antique Meissner AM High Fidelity tuner that I had restored. But by the time the amp was finished it sounded so good that it has become my amp of choice for listening to CDs while working in the shop. The only parts purchased new....
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You may admit abounding of the date circuits - as they are agnate to those acclimated in some of my added projects. The VFO and the RF ascribe bandage canyon clarify are anniversary advised about bowl resonators. These are acceptable difficult to locate.....
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well i did a quick search, and i didnt find much on this issue my question is: Can anyone provide a diagram on how cruise control is wired up (94-....
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The "burn and learn" method of firmware development excludes an in-circuit emulator and a serial port. With this method, it is common practice to use spare I/O pins on a µC as a debugging aid. By strategically placing instructions to set and clear these I/O....
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The purpose of D-type flip-flop IC2 is to synchronize the input signal with the clock pulse. When the clock pulse changes from low to high and the input is high, IC2 output is high. Subsequently, IC3 resets to zero and starts counting up. Until the counter....
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Using AD9284 with the interface of adl5380 demodulator. I tried to work in default mode of AD9284. I have checked I and Q outputs of demodulator and everything was fine there. When i checked digital outputs of AD9284, I could not see the desired output. So,....
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This DIY 12V to 220V DC to AC converter is built with CMOS 4047 that is the main component of this small voltage converter that transforms a 12VDC into 220....
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This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It`s certainly not the first wireless microphone we`ve ever published but this one is a little different. It`s stereo, providing....
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Lithium-based (Li+) batteries are becoming common in portable equipment. They have desirable characteristics, but they are often in short supply. Lead times can be long unless you have a preferred-customer status with the battery manufacturer. A backup....
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U1 is the 3817 integrated circuit. It has the ability to drive the display directly, and it can display 12h or 24h, schedule alarm sounds, timely and automatically turn on the radio. Display is FND500 light-emitting diode, the input frequency is 50H or 60Hz.....
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Based on Valvo FD-1A module, TBA120, and MC1310. Operation of the receiver is based on the phase locked loop principle. The FD-1A contains an RF amplifier, oscillator and mixer (made with BF324, BF451 and BF324 transistors, respectively). Tuning is performed....
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A major feature of the PWM servo amplifier is elimination of a pulse transformer. A 150 kHz pulsewidth modulated signal is applied to U3, with its complementary outputs applied to identical circuits to drive the load. When point A increases, Q2 is on and....
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An input rectangular signal is differentiated and short impulses are formed from its edges. These impulses write the content of counter A to a latch that clears the counter after a very short time. Counter A counts impulses of the frequency fo that are much....
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When the carrier level is adequate to switch the cross-coupled pair of differential amplifiers, the modu· lation signal, which has been applied to the gate, will be switched at the carrier rate, between the collector loads. When switching occurs, it will....
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An efficiency of around 85 % and a power output of more than 200 watts is what you will get from the present design of a power inverter (home built). Complete circuit schematic and building procedure explained herein. You might have come across many articles....
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The optical signal is coupled to the pin diode. Current flowing in the diode also flows into the input of the NE5211 preamplifier. The preamplifier is a fixed-gain block that has a 28-K!J differential transimpedance and does a single-ended to differential....
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To be able to implement analog to digital conversion using the ADC0804LCN 8-bit A/D converter. You will design a circuit and program the chip so that when an analog signal is given as input, the equivalent digital voltage is displayed on an LCD display.....
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Here you can find plans for a simple ground plane antenna that works well in the FM Band (88-108MHz). It`s built of a small plastic disk 6 x 6 Loop Antenna - This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to....
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As shown in FIG grounds ISO124 and MC78L05, an external regulator MC79L05 and DCP011515 constituted improve power supply rejection ratio (PSR) circuit. Input signal VIN (maximu..
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Welcome to the Birmingham, Alabama Crystal Radio Group website. We are the host of the crystal radio receiving contest.This page contains a little information about us and our crystal set activities. Here are some of the 2008 contest radios, first page. ....
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A low frequency test oscillator for testing tone controls and experimenting....
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A Simple LED Voltmeter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the battery is indicated through a four level LED indicators. The nominal terminal voltage of a Lead Acid battery is 13. 8 volts and that of a....
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He only contributes with 3. 2nV/ HZ of noise tension and 0. 45pA/ HZ of current noise to the circuit. To minimize the noise of other sources, R3 it is configured for 100 ©. That generates tension of noise additional of only 1. 3nV/ HZ. R1, R2, c1, and c @....
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FM radio transmission frequency band design, it can be used with any FM radio receiver to the high-frequency signal and restores the high frequency signal from the audio signal..
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As shown for the long timer circuit. This circuit uses an operational amplifier CA3094 controlled discharge formula for long timed, usually by changing the RV1 VH, continuously..
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The audio amplifier shown below provides 14 watts of power, but can provide much more simply by increasing the power supply voltage. This amp was built in 1975 and has worked reliably ever since. The power amp portion was published in Popular Electronics in....
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Circuit shown in Figure 2-50. This circuit uses field effect tube should, through the ingenious electronic components constitute a unique self-lighting controller. The informal..
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The input attenuator uses a commutating capacitor to cancel the input capacitance of the FET buffer (see DC-10 MHz amp schematic). The commutating capacitors are absolutely necessary to cancel the effect of the input capacitance to the DC-10MHz amplifier.....
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Car Inverter (Power Converter, Power Inverter) is a way to convert the DC DC12V and AC220V AC mains the same for general electrical use, is a convenient vehicle power adapter. Car power inverter has been generally welcomed in foreign markets. In foreign....
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What is a PLL oscillator? PLL stands for phase locked loop, and this means a control method by comparation of the controlled plant or system to a reference....
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Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. The circuit can be built on a perf board, universal solder board or PC board, the PC board is....
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This system operates on the principle that capacitance loading of an oscillator will lower its frequency. When a foreign body comes into contact with touch plate, the frequency of Ul is lowered...
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Circuit is shown in Fig. 16-95 - 16-97. The electrode automatic adjuster has better performance. Such as the use of the accuracy high, good linearity current output type bridge..
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This PWM control circuit provides the control pulse to the DMOS Power Switch in the flyback circuit. The output of the PWM is a pulse whose width is proportional to the input control voltage and whose repetition rate is determined by an external clock....
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The following circuit shows about 14 Watt Compact Fluorescent Electronic Ballast Circuit Diagram. Features: similar to a 16 Watt circuit, 14 Watt ....