Popular Circuits Page 130
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My design is somewhat like a combination of the circuits in M49 and U47, but mounted with the tube used in U67. There`s really not a lot of complicated electronics here. This is a true variable-pattern microphone, capable of doing omni, cardiod and....
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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This is the Transistor tester into the Circuit or PCB. When your project do not works, the tester electronic parts or....
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The circuit in Figure 1 eliminates the need for adjustments. The circuit uses dc-coupled feedback to control the current in the output resistor. Hence, the output voltage is predictable and constant...
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The LT1012 corrects de errors in the booster stage, and does not set high-frequency signals. Fast signals are fed directly to the stage via Q5 and the 0.01-uF coupling capacitors. De and low-frequency signals drive the stage via the op-amp"s output. The....
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An almost identical recreation of the SAP-1 Simple As Possible microprocessor, as published in Digital Computer Electronics by Albert Malvino and Jerald Brown. While the book is out of print an "ebook" can be found fairly easily if you know where to look. I....
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A typical specification can range from a low of 36V to a high of 72- with a 48-V nominal. In some designs, transients in excess of 100V need to be considered. Most of these designs will require input to output isolation of up to 1500V. Output voltages are....
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This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell Cut-off and Reset. The basic alarm has a single zone. This will be adequate in many situations. However - the modular design....
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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 natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
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Notebook computer chip power supply circuit Notebook chip power supply circuit which generates the PWM circuit using MAX8775...
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This system uses a Microchip's PIC16F877A as a main controller, LM339 as sensor interface, UM3561 as a tone generator and ?PC2002 as a speaker driver (audio amplifier). LM7805, LM7812 and LM317 voltage regulators are used to obtain +5V, +12V and +3V....
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This scan is from my old ETI Circuits #2 from the 70 ²s. It`s about the best op-amp info you are likely to find. With a bit of knowledge, these six circuits are an instant ready-reckoner and allow you to do almost anything! If you want to learn then they are....
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This FM spy telephone circuit is mounted serrial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires wic....
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Whatever past project these were used in obviously required three cells to be wired in parallel with a rather large (4700 uF) capacitor on a perf board. There were 13 of these board assemblies, for a total of 39 solar cells and 13 capacitors (not to mention....
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This thermometer is capable of measuring temperatures from - 30 to +120 °F. A diode-connected 2N3904 transistor form..
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FGDF-3 three-phase low-temperature iron plating main circuit KGDF-3 low-temperature iron plating power supply device having a single-phase low-temperature iron plating all the ..
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PLC input cards rarely supply power, it means that needs external power supply for the inputs and sensors. Below is an Input card and Ladder Logic diagram that shows how to connect an AC input card. The PLC inputs must convert a variety of logic levels tothe....
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Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm long with a bob adjusted to make it beat every second. It is suspended on a short piece of mainspring from a....
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An eight watt amplifier based on the LM383 power audio amplifier ic. It`s advised that you use this ic with a suitable heatsink...
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Power supplies ? Linear or SMPS (Switched mode) Right away there?s a distinction made between a linear and a switch mode power supply, what?s the difference? A power supply fundamentally is an....
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LM111 comparator can be used o design a relay driver with TTL strobe, this can be used to provide more control of your relay driver. You can control the strobe....
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Here is the 22 watt stereo audio power amplifier circuit diagram based on TDA1554 and integrated circuit from NXP semiconductors (formerly PHILIPS semiconductors). It is very simple and useful circuit for amplify the stereo signals. The circuit dissipates....
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I already have one project where arduino outputs audio signal to USB speakers via software 10-bits PWM. In first, I was not satisfied with quality of sound generated via PWM. There are just not enough speed in arduino engine to run PWM well. For example for....
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The EM4294 is an analogue front end for high secure 13. 56MHz RFID reader systems. The reader integrates the crypto algorithm of the EM4035 transponder IC associated with 4 secret keys. Each secret key is 96 bit length and it gives access to the EM4035 tag....
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Achieving the highest possible performance from circuits used in third-and fourth-generation wireless systems is driving a tighter integration of previously disparate tools. Certainly, a level of software synergy is essential when designing circuits for use....
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The crystal element in this circuit is connected directly between the base and ground. Capacitor Cl is used to improve the feedback due to the internal capacitances of the transistor. This capacitor should be mounted as close as possible to the case of the....
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It is always desirable to use a low-battery indicator that consumes as little power as possible. For a 9V, 450-mAhr alkaline battery, a 50-µA low-battery indicator can by itself run the battery down in a little more than a year. Battery-powered devices that....
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The following is a main circuit of the mixer-6 Ch The circuit consists of six input channels. The mono channels are channels 1-4 and 5-6 CH CH, are intended for use by music. The number of input channels you want as she can greatly increase you want. The....
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The first was interested in a flexible preamp for use with a high-end acoustic guitar with piezo-electric bridge pickup, and the second wanted a preamp for use with a guitar emulator, to provide add someof the warmth that vacuum valves can provide. Both of....
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The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set by adjusting the variable resistor.....
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Power-supply designers usually like flyback converters to operate in DCM (discontinuous-conduction mode) rather than in CCM (continuous-conduction mode). In DCM, the flyback converter is a first-order system at low frequencies, which eases the feedback-loop....
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The incoming RGB inputs are terminated with resistors Rl, R2, and R3 and potentiometers RVl, RV2, and RV3. These provide input impedances of approximately 75 0. The presets should be adjusted to provide a maximum input of 1 V pk-pk into the MC1377. The....
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In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two Arduinos are programmed to communicate with one another in a Master Reader/Slave Sender configuration via the I2C....
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An LC oscillator is driven by pulses which are generated by a 555 IC based oscillator. LC oscillator is built around 2SC2078. The circuit is shown in Fig. 1. The circuit and the Ansoft Designer simulation. Measured and simulated resonance frequencies are....
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I am not a great fan of novelty radios, but this one looks swell on the wall and doesn`t take up any shelf space. The Guild "Country Belle" is one of the most recognizable tube novelty radios. Patterned after an old-fashioned wall telephone, this model was....
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Here the circuit diagram of DC battery tester designed by Matthew B. This circuit can be used to measure DC battery from 1. 5V up to 9V. Component Parts List: R1 = 18K Ohm R2 = 240 Ohm R3 = 8. 2K Ohm R4 = 3K Ohm R5 = 10 Ohm M1 = Panel Meter (Anyone will.....
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A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately....
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This is a small general purpose audio test set. It comprises a low 0. 3% distortion phase shift oscillator and a level meter. The level meteris set at 100mV FSD and can be used for gain measurements and general testing. Current consumption is just under 4mA.....
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This circuit was designed and manufactured the `80`s. From then it works without problem. It does not present any particular constructional problem, beyond known: the attention in the provided force of power supply - choice suitable heatsink and good....
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Now gently bend the leads of the LEDs and using the schematic circuit diagram given below begin to solder Once you finish soldering, it shoul....
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This project has been specially designed to introduce you to SMD (Surface Mount Devices). Surface Mount is really not new. It started as far back as 1940 with a hybrid circuit in a digital watch. A chip was cemented onto a slab of ceramic material having....
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Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone...
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A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/patient is not a good idea. Here is an ultra simple battery operated remote controlled alarm to help....
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5 band graphic equalizer using a single IC/chip. The BA3812L is a five-point graphic equalizer that has all the required functions integrated. ","0",..
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The Part of 1995 Ford Ranger Wiring Diagram: transmission range sensor, electronic engine control, clutch pedal position switch jumper, electronic engine control, speed control, automatic transmission, starter interupt relay, rela box, starter motor during....
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Cathode-follower hydrophone isolation amplifier and high-gain preamplifier feed Navy RBA-6 low-frequency radio receiver on trawler, to receive modulated 21-kc beam that transmits trawl net depth data. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl....
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Stethoscopes are not only useful for doctors, but home mechanics, exterminators, spying and any number of other uses. Standard stethoscopes provide no amplification which limits their use. This circuit uses op-amps to greatly amplify a standard stethoscope,....
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We expect oscillation at the resonant frequency at which the positive feedback is at 0 degrees (in phase) with the input. For oscillation to occur, the gain has to be at least 1 at that frequency. Kaz Oct 30 `12 at 20:39 I still think the 10u cap has wrong....
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Discusses the future direction of the Free Charge Controller project and proposes a new solar charge controller circuit....
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This is a new design of a tutorial board based on the popular PIC16F84A microcontroller. It features eight single leds, a 7-segment display, an LCD display and five push buttons. It is an ideal solution for the beginner to take his/her first programming....
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The Above circuits are based on TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package manufactured by UTC .Circuit has an Internal Thermal Protector. It is designed for portable cassette players and radios. You can also....
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In the circuit, Ql and Q2 are connected in the classic SCR or thyristor configuration. Where higher input voltages or minimum component count are required, the circuit for thyristor boost can be used. The thyristor is running in a linear mode with its....
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We added an external piezoelectric element to set on the bench top, making it easier for kids to reach. We simply soldered this external piezo element to the same pads as the Tap-Tempo Metronome`s built-in piezo element. Here`s the large piezo we used. For....
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The AK4532 is a low-cost high-quality 16-Bit CODEC designed specifically for Internet Boxes, Network PCs, and to Interface with Audio Video controller ICs for standard PC applications. AKMs AK4532 serial Interface mode simplifies the design process on....
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The DE2 board is equipped with an Analog Devices ADV7181 TV decoder chip. The ADV7181 is an integrated video decoder that automatically detects and converts a standard analog baseband television signal (NTSC, PAL, and SECAM) into 4:2:2 component video data....
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Display counter circuit Explanation Here is a circuit diagram of a seven-segment on the counter IC CD 4033...
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It can be possible and it can be implemented using P-MOS and N-MOS together in a circuit i. e. what is called C-MOS. There we can implement Three Terminal NAND GATE. It is a universal gate which is used commonly so can proceed further...
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Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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I have seen these devices advertised in magazines, they sell for around £40-£50 and use radio to transmit between receiver and transmitter. This version costs under £5 to make and uses a cable connection between receiver and transmitter. For example, if you....
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LED message system on a Strida folding bicycle wheel After I`ve bought my strida folding bicycle, one of the first things I`ve done was to check out instru....
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This Project Components tester can be used to check the electronic components such us Diode, Transistor, Capacitor, IC555, IC741 and Continuity. The whole circuit was controlled by the Microcontroller AT89C52. The circuit has an LCD display it was used to....
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This electronic pressure gauge uses a Wheatstone bridge-type pressure sensor tb drive a 3 A digit A/D converter and a display. IC1 is a pump (quad) that interfaces the bridge sensor to the A/D converter. R16 provides zero adjustment and R6 provides....
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220V AC by VDl a VD4 bridge rectifier, resistor Rl0 buck regulator VD5 regulator and C2, after filtering supply electricity to the manifold. Manifold output trigger signal is d..
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The first servo controller project at http://www.rentron.com/servo.htm had the com port fixed at com1. This new version will seek out the available com ports on your PC and then let you select the desired port and baud rates. It has 1 additional servo port....
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This is a fun and non-dangeros project for those people who like to throw projectiles magnetically. It simply works by placing a ferromagnetic projectile at one end of a coil and pulsing some power in it. The trick is to switch off power when the projectile....
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This is the type that has a little DC motor fan positioned above a small container containing a deoderant liquid or jelly, and runs off a D cell. The photocell turns off the fan when it gets dark. The LED flashes if the battery is good...
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Telephones are reaching its death point all over the world. however there is more than 350 million mobile phone users in india, but there are tremendous number of telephone users are there also. Well, this telephone timer is designed to help saving by....
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The South Africa company, which has developed the 5 kilowatt Fuel Free Generator, has discovered that the batteries` longevity is significantly effected by the process. As far as the choice of batteries to test is concerned, there are many different lead....
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Since the transmission circuit inductive wireless headset must be fixedly mounted on a wall or ceiling of a room, it can not be..
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Cypress` Dave Van Ess cautions circuit designers about the sloppy overuse of op amps with examples and circuit theory..
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This dual power supply is based on the L165 power operational amplifier from SGS-Thomson Micro electronics. The IC L165 can easily deliver up to 3. 5A of current (internally limited). The IC is available in Pentawatt package and is very suitable for power....
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By the ultrasonic sensor, control and display (or buzzer) and local composition, it can tell the driver his around obstacles by voice or a more intuitive display case. Relieve the driver stop, reverse and start to visit around the vehicle caused by problems,....
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The circuit will modulate the light from the LED using a crystal microphone or a loudspeaker output. To obtain the maximum range, the optical system must be efficient (see example). Either a convex lens or a concave mirror can be used to convert the LED....
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The circuitry of the ZXInterface2 is very simple and is comprised of a single custom made IC which performs address decoding for the twin joystick interface. The ROM cartridge socket simply exposes signals already available from the Spectrum`s edge....
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I had never worked with " common base" or "grounded base" designs before and you know, I still don`t understand how they can amplify. Another thing, I had never used a bipolar transistor in a regenerative stage before, but had read that the amplification....
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This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs through to the output in turn, with some signal massaging in between. As shown, it is suitable only for....
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LM5576MHX absolute maximum ratings: (1)VIN to GND: 76V; (2)BST to GND: 90V; (3)PRE to GND: 76V; (4)SW to GND (Steady State): -1. 5V; (5)BST to VCC: 76V; (6)SD, VCC to GND: 14V; (7)BST to SW: 14V; (8)OUT to GND: Limited to Vin; (9)SYNC, SS, FB, RAMP to GND:....
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This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass....
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As shown, the circuit due to the integrated amplifier, so the circuit is simple, small size. TDA4050 IC used here, a weak signal is received by the infrared photodiode VD, firs..
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The adjustable voltage monitor can be used to check whether the voltage in a circuit remains within a given range. If the dc voltage is less than the voltage at pin 5 of-Ul-B, then LED 1 will light. If the voltage is over 5V, LED2 will light. If the voltage....
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IperCODE is a didactic project, with which it is possible to build a remote control acquisition system, based on the rolling code and to have the possibility to transmit the received code on RS232 serial port, to visualize it on the 16X2 display or to....
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This circuit have applied to line detection of robot project, Good match between the transmitter and the detector is important for proper operation, especially if the hole is large. Robot with a simple object or obstacle detection. Infrared Transmitter....
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This is audio mixer circuit. The circuit is for one channel input, if you need, for example 5 channel mixer, then you need to build 5 similar circuits...
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This design was born of frustration with the mic preamp in my Sony R91. It clips at ridiculously low levels, basically it has 28mV of headroom to deal with an input that could be as high as 1800mV (depending on mic & volume), so this design attempts to cure....
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RF power amplifier circuit of this work is based on the transistor 2SC1970 and 2N4427. The set output power of 88-108 MHz FM RF Amplifier With 2SC1970 is about 1. 3W and the input driver is 30-50mW. RF driver amplifier circuit uses a 2N4427 and its power....
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A dual-RCX, six motor dog. Slashdot Review. Cindy Salwen pointed out a description of the protocol for the serial interface between the computer and the Dacta Control lab. This may or may not be related to the protocol used by the RCX, but if you`re reading....
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The CDCF5801 provides Clock multiplication from a reference Clock (REFCLK) signal with the unique capability to delay or advance the CLKOUT/CLKOUTB with steps of only 1. 3 mUI through a phase aligner. For every rising edge on the DLYCTRL pin the CLKOUT is....
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Here is a High efficiency Emergency Lamp using High bright White LEDs. It automatically turns on when power fails and turns off when power resumes ..
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Common Light Emitting Diodes (LEDs) require a DC forward bias current of 10 to 20 mA for proper operation. Typically the maximum DC current is 30 to 50 mA. The color of light (or wavelength ») emitted from an LED depends on the semiconductor material used to....
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A low distortion audio frequency sine wave can be easily generated by passing the output of a simple square wave oscillator through a sharp cut off low pass filter to attenuate the odd harmonic components. The output level of the sine wave is precisely....