New Circuits Page 87
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The MC74HC4538A is identical in pinout to the MC14538B. The device inputs are compatible with standard CMOS outputs; with pullup Resistors they are compatible with LSTTL outputs. This dual monostable....
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The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually not powerful enough to take a satisfactory picture. Unfortunately most such cameras do not include a....
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It is good idea to put this circuit in a box and mark/write each LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will glow. The Number marked for glowing LED becomes dice`s output. Every time S1 is released, new LED....
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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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The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED....
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Here`s how to build a pendulum-controlled clock which can be made really accurate. Retro - yes, but an interesting project all the same. You`ll need a spare quartz clock which must be adapted by first isolating the two pads on the chip which lead to the....
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This UHF wideband signal amplifier has a total gain of 10 to 15 dB in the 400 - 850 MHz domain frequency so it can be used where the tv signal is weak. For UHF TV signal amplifier to work correctly, you need to cut the components pins as short as possible.....
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Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer discussed here is a functional equivalent and electronic replica of the Torricelli barometer. Actually,....
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While the Jacob`s Ladder is simple to construct, the operation is quite interesting. The spark starts at the bottom where the gap between the wires is close and then heat makes the plasma rise and stretch between the electrodes until there is no longer....
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These circuits provide o,vervoltage protection in case of voltage regulator failure or application of an external voltage. Intended to be used with a supply offering some form of short circuit protection, either foldback, current limiting, or a simple fuse.....
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This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding. The transformer contains a single turn primary with a low 0. 001-ohm resistance. It can easily handle 30 amps....
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The Softrock Lite V6. 2 series provide an economical entry-level kit for the ham or SWL who wants to experiment with Software Defined Radio (SDR). As of 10/26/2008, the offerings in this series are (links are to schematics in Yahoo Groups files folder ):....
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Using an EXAR XR2206, this generator will produce sine, square, and triangular waves from Hz to 100 kHz. U1 is the XR2206 chip, R7 controls frequency, and 55 through 58 select the frequency range. U3 produces a TTL-compatible square-wave output, while U3C....
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A parametric equalizer on an audio-mixer-sized PCB...
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As per the note on the schematic IC-2 is a 74HC74 TTL chip, look up the data sheet and it will show you what pins 7 and 14 are. The note for IC-3 is down lower its an AC optocoupler part number MOC3041. D2 is noted as a 15volt. 4 watt zener diode, a part....
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First, the 4017`s aren`t initialized to a known state since the reset pins aren`t briefly forced high when the circuit powers on. The chips might usually power up in the normal reset condition, but that isn`t probably guaranteed by the IC manufacturer. This....
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This circuit can be used to test whether mains voltage is present or not without having electric contact with mains line. The CMOS IC CD4033 is the heart of this circuit. The CD4033 consists of a 5 stage decade Johnson counter and an output decoder for....
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Electronic project describing a D.C. Mixer for Synthesizers and other control applications....
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Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual supply is not affordable or not practicable. This circuit solves the problem to a certain extent. It....
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This DC power supply controller is controlled by pulse width modulation PWM, generated by the circuit around timer IC2 7555 according to the formula: Duty....
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Create a PC synch cord off of the extension cable by putting in a connector and having different plugs on the opposite end. So if I read this correctly, you could create a PC synch cord off of the extension cable by putting in a connector and having....
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Safety polarity connection circuit design using common electronic components..
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This area shows the construction and testing of a medium to large class Tesla coil. In this section, the previous coils were dismantled and a new larger coil, with a secondary over 6 inches, was redesigned and constructed for maximum efficiency at a power if....
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For the best advantage as a low noise high input impedance device, the preamp and tone control uses JFET. If the circuit reaches harmonic distortion levels of...
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An Hartley Oscillator circuit can be made from a pair of series connected coils. I had a couple of 22mH fixed inductors, which I hooked up on a breadboard with the other needed pieces. When I test the transistor amplifier independently, it seems to be....
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KCZ3 integrated three - pulse triggering component SCR is suitable for three-phase half-bridge inverter trigger. Each phase output pulse can be reliably drive a high-power thyristor, and it can adapt to a variety of phase voltage.The electrical parameters....
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There are basically two systems of pneumatic central locking on Audis of the vintage that I deal with - the earlier cars are controlled by the drivers door lock, and the later ones by both front door locks. The early ones (5000/100/200 before 1984,....
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The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here....
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Door Phone , LM 386 is just right for a door phone application. It is very useful application in the present urban households. One condenser microphone and a speake....
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There are solutions to this problem—mechanical (push On/push Off switch), electromagnetic (latching relay) and electronic (CMOS logic), but few (if any) go....
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Here is a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed. The circuit consists of two astable multivibrators. One....
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Take the voltage output from a 3. 5mm audio jack and have it light up an LED according to it`s voltage. I was going to attach the left audio cable to the base of a 2222n transistor which would act as my amplifier to trigger the LED to light. Unfortunately,....
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Ultrasonic recipients will receive an ultrasonic signal emitted by an ultrasonic transmitter in accordance with the characteristic frequency. Received signal is going through the process of filtering using the frequency band pass filter circuit, with a....
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This is a circuit that will go off if the circuit detects any sound above a certain threshold. Once the circuit detects sound, the alarm goes off alerting us to this sound. This circuit has extreme use when an area ordinarily should be very quiet and should....
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This circuit allows you to set a limit on the maximum output current available from your PSU. It`s very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you....
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A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed surge protection on all telephone lines exposed to storm risks. Paradoxically, now that we are hooking up delicate and....
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This remotely controlled watering system is both inexpensive and easy to expand. It is designed to operate in conjunction with a conventional watering timer and allows remote switching between nine zones. The prototype is used in a bore system, where a....
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This UHF amplifier circuit electronic project can be useful in situations where the TV signal is weak. The UHF amplifier circuit has a gain of 10-15 dB in a frequency range between 400 and 850 MHz. To obtain optimum performance and good reliability, the PCB....
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It had been only a little over a decade since the transistor was invented when this article appeared in the August 1959 edition of Popular Electronics. Transistors were still a mystery to most people, including engineers, technicians, and hobbyists. Author....
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Two-phase hybrid stepping motor dynamic voltage 12 to 48V, the current is less than 5A outer diameter of 35 to 86 mm. This drive using the drive`s current loop subdivision control, the motor torque ripple is very small, low-speed running is very smooth,....
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This is a differentiator circuit. This circuit can be used to do differential operation. There are two differentiator, the are true differentiator and....
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This type of design can produce a very high amperage current for a faction a second that can used to do some useful work if properly harnessed. The switching device could be a rotating spark gap as used by Nikola Tesla or some high speed electronic device,....
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A warm weather problem with 2003 Audi A6 2. 7T. When the car sits in the sun the radio loses reception for about 10 minutes until the inside cools down (appears correlated). I also have noticed that intermittently my reverse sensor horn is not beeping (not....
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A “Cell Jammer†is just way of saying “Dirty Transmitter†which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better. T....
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Traditionally, high quality reception of VLF natural radio signals has involved driving or hiking out to remote locations far from civilisation, in order to find an environment free of pollution by artificial radio signals. I`ve lost count of the times I`ve....
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I am posting here a circuit example for interfacing RF module using HT12E/D encoder decoder pair. The circuit attached here can be used to transfer data using the RF module. As I have explained earlier RF module mentioned here is having a single channel. So....
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This assemblage was advised for amateurs owning an old accumulating of vinyl recordings and absent to accept it digitally remastered into a claimed computer. Or sometimes they would accept to an old, invaluable, LP accumulating through their avant-garde....
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20 Watt Car Power Amplifier circuit diagram bases TDA 2005. This TDA 2005 IC was designed specifically in car audio system for power boosting applications. This IC has a protection against short circuit and overheating. In the above circuit use a bridge....
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Can be interfaced to other adapters Keypad adapter (Optional) or RF receiver (Optional) or Via the Net (Optional) Can be adapted to operate other external attachmen....
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This tutorial looks at the tools needed to start development (C programming) on 8-bit AVR microcontrollers and shows how to write a C program and load it to an AVR microcontroller. An ATtiny2313 microcontroller breadboard circuit will be used as the test....
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This cell phone charger circuit diagram electronic project is based on the FSEZ1307 third-generation primary side regulation (PSR) PWM controller integrated circuit. The FEZ1307 cell phone charger can be used for battery chargers applications for devices....
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Easy to build high-quality PLL FM transmitter with typical output power of 5 W and no-tune design. The transmitter includes RDS/SCA input and Audio/MPX input with optional pre-emphasis. It can be used with or without stereo encoder. Tuning over the FM band....
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Here is the circuit diagram of a guitar preamplifier that would accept any standard guitar pickup. It is also versatile in that it has two signal outputs. A typical example of using a pick-up attached to a guitar headstock is shown in Fig. 1. The pickup....
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Do you know how infrared motion detector alarm Whenever someone comes in the infra-red zone. Infrared motion sensor, which detects moving human body. The alarm will sound automatically. The detection zone coverage is 80 degrees horizontally to 8 meters....
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Monostable 555 timer multivibrator circuit (one shot monostable multivibrator) is a retriggerable mono shot pulse generator. The name Mono stable` indicates that it has only one stable state. The unstable state is called Quasi stable state`. The duration of....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply....
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Though it`s the world LEDs today, an ordinary flashlight bulb can also be considered a useful light emitting candidate especially because it`s much to configure than an LED. However, the moment AC mains fails, T1 is instantly forward biased, it conducts and....
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Control a small DC motor through this H-bridge with an Arduino Uno, but I have never programmed one of these controllers before. I need the motor to rotate in different directions when I press left and right on a keyboard. So far I have this code: // Right....
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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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cable LAN tester circuit can also to test cable on telephone, coaxial cable, Lan cable and other. this circuit using led for main indicator device..
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A Dual Inline Package, or DIP switch can be used to select between 0 and 5 volts at some point in a circuit. Since the dip switch does not have any power or ground connectors this must be done externally. When the switch is turned on (in the "closed"....
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With the microelectronics and technical fast development of information, the digital technical development represented by one-chip computer changes with each passing day. Because one-chip computer have small, low power dissipation, strong expanding....
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This Power Converter is used in LHC Machine to power superconductive magnets. It is located in the LHC underground installation, close to the loads to limit cable losses in the underground installation. Voltage Source is based on a half bridge resonnant....
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Amplitude Modulation (AKA AM) was the first modulation type to impress audio on an RF carrier. Prior to this, information was transmitted via on/off keying of a continuous wave transmitter using Morse code or some equivalent. 1. Low level modulation. The....
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The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential amplifier IC1 ensures that the potential across R2 is equal to the input voltage: Iout =Uin/R2. The....
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The schematic herein shows a minimum component solution to the USB battery charger using LTC4053 IC to achieve a fully compliant USB charger. This IC is a standalone linear charger for lithium ion (li-ion) batteries that can be powered directly from a USB....
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In some of my previous posts, we have seen the simulations of half wave and full wave rectifiers using simple diodes. Now in this post, I would like to move on to power electronics domain with the first post being Single Phase half wave rectifier using....
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I have posted wide varieties ofsmall electronic projects onwater level sensor in Circuits Gallery. This is another project for school students to detect the water level inside a water tank or any other water reservoir. We can call this as a liquid level....
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Simple circuit No ICs required, 12V Battery operation This circuit was requested by several correspondents. Its purpose was to obtain more power than th....
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This particular circuit was built with an LED Indicator. There are Two LED`s Shown in the Schematic, Both do Exactly the same thing. I was just Playing with it. Advanced Schematic-2 This Modification in Advance Schematic-2 "Will Make this detector More....
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As shown in the picture, when the output current exceeds 40mA the internal resistance 50? in the XTR110 (R9) should be replaced by external resistance REXT. REXT is connected between the 13 foot and 16 foot. REXY=R9(original span/required span). For example,....
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Circuitdiagram of marine tv dishe. circuitdiagram of marine tv dishe, circuitdiagram of marine tv dishe, 12dc to 120ac inverter circuitdiagram pdf+, 12dc to 120ac inverter circuitdiagram pdf+....
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LM339 based peak detector circuit.Simple and easy to construct. Operates from 5V DC single supply. LM339 is a dual comparator....
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The Voice Changer has two different inputs, the microphone and the switches. The Voice Changer then outputs a signal to an OpAmp to amplify the signal being sent to the speaker. The frequency of this signal is changed depending on what voice effect is turned....
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Vibration Sensor or Piezoelectric Vibration Sensor Circuit Diagram. It generates a loud beep when somebody tries to break the door or window. The alarm stops automatically after three minutes. The circuit uses a piezo element as the vibration sensor ..
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This Light Dark switch activated relay circuits schematics are the simplest electronic circuits that can help you to activate other electronic device at the light or dark. This Light Dark switch activated relay circuits are very simple and require one....
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Bruco Integrated Circuits B.V. >> Case: Automotive alternator voltage regulator - Bruco....
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For proper operation, circuit ground must be connected via a small value, high voltage-rating capacitor to one side of the mains supply socket. The "Live" side is the right one. The purpose of this circuit is to animate shop-windows by means of a capacitive....
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