New Circuits Page 15
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Schematics for an 80W electronic ballast to drive 2 48"" lamps....
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This is a project of a mini USB car charger circuit. The circuit is very simple to build using only three components. Heart of the circuit is a LM78M05 IC which is a 5V positive voltage regulator IC. This IC has many built in featuers like thermal overload....
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This 18 dB gain amplifier was built Manhattan-style to evaluate the Linear Technology LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices. This dual amplifier was chosen to take....
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If you switch gears over 5k during a solar eclipse you`ll have to have your nut bearings revalved. There is a lot that goes into it. Same goes for making a sammich. They`re Fedders Inverter units. 12K & 18K. I understand they`re tricky to get the charge....
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A distance sensor would be a nice addition to Mindstorms robots, but ultrasonic ones were bulky and power hungry, and simple infrared method like the one I used in my radar car detects obstacles but don`t give true distance measurement. The solution came....
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STANDBY/ON switch below is appropriate for applications (industrial and telecom, for example) in which the circuitry must remember its state (STANDBY or ON)...
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For some reason, I`m getting back into the universe of QRSS, or very slow Morse code. I goofed around with this for a while, writing some software to record audio and produce the necessary FFTs so that you can read Morse from these incredibly long Morse....
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This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without....
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Built quickly from the parts found on my home lab, seemed to work on short test with telephone line simulator and line connected to PBX, I have received a report that this circuit works well in Australia This circuit is a simple circuit which prevents....
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hi every one im not in the line to electronics so please can any one make a diagram for me that how i change this circuit so that it will dial a number using speed dial and also beeps a siren when triggerd and i also add some vibration sensors as siren....
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Over 90% energy saving than incandescent or halogen bulbs Lifespan is over 50,000 hours. No flickering. Good for human eyes. No RF interference or UV radiation. Special design for excellent thermal management Input Voltage: AC85-265V Output Voltage:....
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The 900 Hz tone is generated with an LC-oscillator. The "L" part of the "LC" is provided by the inductance of the oscillator`s output coupling transformer T1. It is a variation on one of the two standard Hartley oscillator configurations (named after its....
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When you ability accept apparent abounding videos about you tube assuming off crazy LED cubes, basic 3-D structures etc. But haven`t acquisition annihilation that explains how this is actuality done. Well analytic over internet i begin this abundant activity....
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The game Tetris using a PIC16F84 running @ 12MHz. Tetris is an old Russian computer game where you should try to fit in block into a play-field, quite simple but really fun. In my version, the video signal is generated in softw1are. The only hardware used....
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The TDA2004 is a class B dual audio power amplifier in MULTIWATT [package Designed specifically for car radio applications. TDA2004 has low noise, low distortion, and robust. The robustness is supported by its operation safety protection features: very....
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In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified....
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This circuit depends on the entry of a correct sequence code. An incorrect number that is not part of the code causes the circuit to reset. When the correct code is entered, Q2 operates relay K1 for a short time, depending on C3. ..
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A copy from an old italian magazine of amatorial electronics, proposing an add-on for tube receivers. The add-on was a simple one-tube short-wave transmitter leveraging the same power supply already available in the receiver. This circuit fascinated me when....
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Switched mode power supply units (SMPSUs) are popular but difficult to build oneself as well problematic when it comes to understanding their design princ....
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CELLPHONE OPERATED LAND ROVER (MOBILE PHONE OPERATED ROBOT). In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot....
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I have successfully used a 4511 IC to make numbers 1-9 appear on a 7 segment led display, cool. Now how can I use this to say have it display a number ....
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The project I present here is my attempt at a universal QRP T/R switch. The idea is to take care of the essentials, so that any QRP (i. e. , less than 10W) receiver *AND* CW transmitter can be connected, and work seamlessly. These are what I considered the....
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This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages. It is intended for charging lead-acid batteries, but may also be used for charging....
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The AMU2481 Audio Mixer is a digital realtime signal processor in NMOS technology, housed in a 24pin Dil plastic package or in a 44pin PLCC package. It is de- signed to perform digital processing of both TV Audio in- formation and digital Audio data supplied....
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-
With the increasing daily reliance on networked data systems, the need for failsafe backup of power supply systems is now essential. Uninterruptible power supply (UPS) technology, with a very high level of reliability, are now extensively used to provide....
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The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special devices and can be built using components that you will no doubt be able to find in the junk box. The alarm-triggering....
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If a page name is not selected by pressing the button, the previously selected page name continues to be used. The value is stored in EEPROM and may be changed at any time. When the unit is first powered on, and any time the Position page is displayed, the....
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EEPROM (Electrically Erasable Programmable Read Only Memory) Is non-volatile memory, meaning it persists after power is removed. The ATmega168 microcontroller has 512 bytes of EEPROM which can be used to store system parameters and small amounts of data.....
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Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to capturing noise pulses having unknown durations and magnitudes. Anyone who has ever tried to observe very....
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Before trying to understand a full bridge circuit, you may care to read up on PWM controllers, which page also describes how a half-bridge circuit works. Most full bridge motor controllers also use pwm! Designing a full-bridge PWM circuit that is reliable....
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A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photo-detector pair up to a distance of....
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Many designers today are implementing embedded systems that require low cost non-volatile memory. Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire....
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The 555 circuit can be re-triggered if the input is held low longer than the output pulse. To prevent this happening, I have included a further timing circuit comprised of the 1Meg resistor and 47n capacitor. Normally, the 47n capacitor is discharged via the....
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The 4046 PPL is used as the heart of a tunable ultrasonic receiver that can be used to locate unheard ultrasonic sounds. The receiver might also be used, along with a simple ultrasonic generator, to send and receive Morse code. The incoming ultrasonic signal....
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Ducati Haynes Pdf Manual PDF Download...
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Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. Pressing....
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This is a design circuit for a stereo amplifier for a high sensitivity stereo parabolic microphone. This circuit can be used for listening to distant sounds. Typical parabolic microphones are mono phonic, this unit has a stereo audio path that helps produce....
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Here`s a nice little circuit diagram for all those hardcore DIYers if you are trying to build a dual fan controller using an ATtiny45 although I`d never use this thing, I`d rather use a CUBLOC. Over the course of a weekend, I cobbled together some leftover....
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The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns....
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A simple touch dimmer circuit diagram using TT6061 IC, which is a touch control integrated circuit used for Light dimmer circuit and lamp dimmer circuits....
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First introduced by the Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits) Pin 1 (Ground) - The ground (or common) pin is the most-negative supply potential of the device, which is....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two “1 of 8 line decoders“74HC138 or 74HCT138) to generate the popular Nigh....
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Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficient white LED modules using the battery power available in automobiles. Here is a safe and simple white LED driver designed for 12V automobiles. In the....
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This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I....
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The design came from the interest of finding a new technique of analog to digital conversion. The two types of ADC (Analog to Digital Converter) that inspired me in the development of this circuit are Flash Type ADC and Successive Approximation Type ADC. The....
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The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals. A "cat`s whisker" wire contact was moved about the surface of the crystal until a diode junction was formed. The 1N34A germanium diode is the modern....
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Binu submitted a new resource: Circuit and Program to Interface MT8870 with AT89S51 (version 1.0) - Decoding the DTMF signals from the telephone line ....
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This motor driver deliver the power form capacitor to the motor when the capacitor is charged to 1.75V by the solar cell. After powering the motor, capacitor...
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Simple Inverter for Soldering Iron. Right here is a very simple but low-cost inverter for making use of a small power soldering iron (25W, 35W, and so on) in the absence of mains supply. It requires eight transistors along with a number of resistors and....
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This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor....
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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 driven either in 4-bit or 8-bit mode. In the first case only the high nibble (D4 to D7) of the display`s....
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A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge....
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When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would....
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This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences for the stock. In the past, the tank had been filled....
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The electronic pests killing lamp circuit consists of the oscillator, control circuit, high voltage generator, LED indicating circuit and power supply circuit, and the circuit is shown as the chart. The oscillator circuit is composed of the time-base....
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About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use....
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The chief advantage of this programmer is its ability to protect both the target and the PC from odd voltages when one side is powered off. The buffers are open-drain, and each is pulled up to the Vcc of the receiving party. The MC74LCX07 has an operating....
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This circuit is a circuit diagram digital voltmeter with LED display. It`s ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V....
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The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator ...
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Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. Low battery voltage....
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After dismantling chinese copy of segway I wanted to check how the controller is made. After a couple of hours of work with multimeter, pen, a sheet of paper and Kicad I came up with a block diagram and schematic of motor controller. This motor controller is....
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The gas detector designed this time is that have adopted the intelligence taking ARM microprocessor as the core to measure the control equipment, it not merely adopts the internationally advanced one-chip computer microprocessing of 1990s, also have the....
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The circuit within the dotted line for a mini emergency light can be incorporated into any battery eliminator, provided the eliminator`s voltage is higher than the battery`s voltage. For greater load (1. e. for more light through a b1gger lamp), Tl should be....
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The design of the charger is similar to that of many commercially available chargers. The charger consists of a mains adaptor, two resistors and a light-emitting diode (LED). In practical use, this kind of charger is perfectly all right. Resistor R1 serves....
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The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and....
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By adding only a few components, you can turn a temperature- and beta-compensated current sink into a common-emitter (CE) amplifier that maintains a stable biased operating point. This Idea for Design will show you how..
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This circuit is designed to create an early warning alarm system for any form of theft that are important to the owners of a motorcycle or bicycle. This alarm system can be used a number of normally open switches such as mercury (italics) switch. It works by....
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A type of output structure used with integrated circuits in which one transistor drives the output high while another transistor connected below it pulls the output low. Many ICs use Totem-Pole Outputs, in fact it`s so common that the output structure isn`t....
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This is a pulse stretcher circuit using optocoupler. This circuit uses a 4N26 opto-coupler combined with a standard one-shot circuitry. This circuit is....
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Controlling the speed of a motor is very important in many situations especially in robotics. There are many techniques of controlling the speed of motors, each with their advantages and disadvantages. This document will show you how to build a motor....
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Usually, semiconductor laser diodes are operated from current drives. Unfortunately, The output power is strongly dependent on the device temperature ? a...
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The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer (T1) and a full wave rectifier (D5 & D6): Zener diode D4 was added to clamp the dc voltage to 15V maximum. Triacs D7, D8 and D9 are insulated from the control circuitry by....
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This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
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The V.U. meter that works with the integrated amplifier circuit.The signal will sound, the audio amplifier circuit into VU meter circuit.And will show the level....
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Liquid-crystal displays come in all sorts and sizes, and this applies also to their pinouts. In fact, many of these displays cannot be used properly without the manufacturers` documentation. But, of course, this can never be found when it is needed, and a....
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This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation.? Here is...
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A very simple LED torch can be designed using the NSI45090JDT4G adjustable constant current regulator (CCR) designed by ON Semiconductor, using extreme few external components. NSI45090JDT4G device is designed to provide a cost effective solution for....
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In industrial production, flow measurement is to employ the extensive measurement physical quantity. Under special circumstances, when for instance vertical externally positioned installation probes of difficult pipeline such as the oil well, etc. , need to....
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Standard Colpitts oscillator Q1 with emitter-follower Q2 gives dependability and adequate isolation from later stages Zener regulation provides stability even with weak battery Output is about 0. 7 VRMS. Low-level parasitic oscillation may occur about 150....
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Series of current pulses are imposed on the structure simulated, and average currents of the 70%~90% section of each curve are calculated, (b) Voltage vs. time curves are obtained from the simulation. And the average voltage of the 70%~90% section of each....
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FM transmitter circuit which is build using single chip of MAX2606. A very simple FM transmitter connects your home-entertainment system to a portable radio that will be carried surrounding the house and into the back yard. As an example, it is possible to....
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Desulfation is the process of reversing the process of sulfation that occurs to a lead-acid battery over time. Desulfation restores, at least partially, the ability of the battery to hold a charge over the life of the battery originally caused by sulfation)....
This is a project of a mini USB car charger circuit. The circuit is very simple to build using only three components. Heart of the circuit is a LM78M05 IC which is a 5V positive voltage regulator IC. This IC has many built in featuers like thermal overload....
This 18 dB gain amplifier was built Manhattan-style to evaluate the Linear Technology LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices. This dual amplifier was chosen to take....
If you switch gears over 5k during a solar eclipse you`ll have to have your nut bearings revalved. There is a lot that goes into it. Same goes for making a sammich. They`re Fedders Inverter units. 12K & 18K. I understand they`re tricky to get the charge....
A distance sensor would be a nice addition to Mindstorms robots, but ultrasonic ones were bulky and power hungry, and simple infrared method like the one I used in my radar car detects obstacles but don`t give true distance measurement. The solution came....
STANDBY/ON switch below is appropriate for applications (industrial and telecom, for example) in which the circuitry must remember its state (STANDBY or ON)...
For some reason, I`m getting back into the universe of QRSS, or very slow Morse code. I goofed around with this for a while, writing some software to record audio and produce the necessary FFTs so that you can read Morse from these incredibly long Morse....
This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without....
Built quickly from the parts found on my home lab, seemed to work on short test with telephone line simulator and line connected to PBX, I have received a report that this circuit works well in Australia This circuit is a simple circuit which prevents....
hi every one im not in the line to electronics so please can any one make a diagram for me that how i change this circuit so that it will dial a number using speed dial and also beeps a siren when triggerd and i also add some vibration sensors as siren....
Over 90% energy saving than incandescent or halogen bulbs Lifespan is over 50,000 hours. No flickering. Good for human eyes. No RF interference or UV radiation. Special design for excellent thermal management Input Voltage: AC85-265V Output Voltage:....
The 900 Hz tone is generated with an LC-oscillator. The "L" part of the "LC" is provided by the inductance of the oscillator`s output coupling transformer T1. It is a variation on one of the two standard Hartley oscillator configurations (named after its....
When you ability accept apparent abounding videos about you tube assuming off crazy LED cubes, basic 3-D structures etc. But haven`t acquisition annihilation that explains how this is actuality done. Well analytic over internet i begin this abundant activity....
The game Tetris using a PIC16F84 running @ 12MHz. Tetris is an old Russian computer game where you should try to fit in block into a play-field, quite simple but really fun. In my version, the video signal is generated in softw1are. The only hardware used....
The TDA2004 is a class B dual audio power amplifier in MULTIWATT [package Designed specifically for car radio applications. TDA2004 has low noise, low distortion, and robust. The robustness is supported by its operation safety protection features: very....
In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified....
This circuit depends on the entry of a correct sequence code. An incorrect number that is not part of the code causes the circuit to reset. When the correct code is entered, Q2 operates relay K1 for a short time, depending on C3. ..
A copy from an old italian magazine of amatorial electronics, proposing an add-on for tube receivers. The add-on was a simple one-tube short-wave transmitter leveraging the same power supply already available in the receiver. This circuit fascinated me when....
Switched mode power supply units (SMPSUs) are popular but difficult to build oneself as well problematic when it comes to understanding their design princ....
CELLPHONE OPERATED LAND ROVER (MOBILE PHONE OPERATED ROBOT). In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot....
I have successfully used a 4511 IC to make numbers 1-9 appear on a 7 segment led display, cool. Now how can I use this to say have it display a number ....
The project I present here is my attempt at a universal QRP T/R switch. The idea is to take care of the essentials, so that any QRP (i. e. , less than 10W) receiver *AND* CW transmitter can be connected, and work seamlessly. These are what I considered the....
This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages. It is intended for charging lead-acid batteries, but may also be used for charging....
The AMU2481 Audio Mixer is a digital realtime signal processor in NMOS technology, housed in a 24pin Dil plastic package or in a 44pin PLCC package. It is de- signed to perform digital processing of both TV Audio in- formation and digital Audio data supplied....
With the increasing daily reliance on networked data systems, the need for failsafe backup of power supply systems is now essential. Uninterruptible power supply (UPS) technology, with a very high level of reliability, are now extensively used to provide....
The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special devices and can be built using components that you will no doubt be able to find in the junk box. The alarm-triggering....
If a page name is not selected by pressing the button, the previously selected page name continues to be used. The value is stored in EEPROM and may be changed at any time. When the unit is first powered on, and any time the Position page is displayed, the....
EEPROM (Electrically Erasable Programmable Read Only Memory) Is non-volatile memory, meaning it persists after power is removed. The ATmega168 microcontroller has 512 bytes of EEPROM which can be used to store system parameters and small amounts of data.....
Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to capturing noise pulses having unknown durations and magnitudes. Anyone who has ever tried to observe very....
Before trying to understand a full bridge circuit, you may care to read up on PWM controllers, which page also describes how a half-bridge circuit works. Most full bridge motor controllers also use pwm! Designing a full-bridge PWM circuit that is reliable....
A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photo-detector pair up to a distance of.....jpg "Serial EEPROM Interfacing (AT24C08 with AT89C2051)")
Many designers today are implementing embedded systems that require low cost non-volatile memory. Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire....
The 555 circuit can be re-triggered if the input is held low longer than the output pulse. To prevent this happening, I have included a further timing circuit comprised of the 1Meg resistor and 47n capacitor. Normally, the 47n capacitor is discharged via the....
The 4046 PPL is used as the heart of a tunable ultrasonic receiver that can be used to locate unheard ultrasonic sounds. The receiver might also be used, along with a simple ultrasonic generator, to send and receive Morse code. The incoming ultrasonic signal....
Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. Pressing....
This is a design circuit for a stereo amplifier for a high sensitivity stereo parabolic microphone. This circuit can be used for listening to distant sounds. Typical parabolic microphones are mono phonic, this unit has a stereo audio path that helps produce....
Here`s a nice little circuit diagram for all those hardcore DIYers if you are trying to build a dual fan controller using an ATtiny45 although I`d never use this thing, I`d rather use a CUBLOC. Over the course of a weekend, I cobbled together some leftover....
The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns....
A simple touch dimmer circuit diagram using TT6061 IC, which is a touch control integrated circuit used for Light dimmer circuit and lamp dimmer circuits....
First introduced by the Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits) Pin 1 (Ground) - The ground (or common) pin is the most-negative supply potential of the device, which is....
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two “1 of 8 line decoders“74HC138 or 74HCT138) to generate the popular Nigh....
Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficient white LED modules using the battery power available in automobiles. Here is a safe and simple white LED driver designed for 12V automobiles. In the....
This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I....
The design came from the interest of finding a new technique of analog to digital conversion. The two types of ADC (Analog to Digital Converter) that inspired me in the development of this circuit are Flash Type ADC and Successive Approximation Type ADC. The....
The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals. A "cat`s whisker" wire contact was moved about the surface of the crystal until a diode junction was formed. The 1N34A germanium diode is the modern....
Binu submitted a new resource: Circuit and Program to Interface MT8870 with AT89S51 (version 1.0) - Decoding the DTMF signals from the telephone line ....
This motor driver deliver the power form capacitor to the motor when the capacitor is charged to 1.75V by the solar cell. After powering the motor, capacitor...
Simple Inverter for Soldering Iron. Right here is a very simple but low-cost inverter for making use of a small power soldering iron (25W, 35W, and so on) in the absence of mains supply. It requires eight transistors along with a number of resistors and....
This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor....
In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi`s industry-standard HD44780 controller. These displays can be driven either in 4-bit or 8-bit mode. In the first case only the high nibble (D4 to D7) of the display`s....
A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge....
When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would....
This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences for the stock. In the past, the tank had been filled....
The electronic pests killing lamp circuit consists of the oscillator, control circuit, high voltage generator, LED indicating circuit and power supply circuit, and the circuit is shown as the chart. The oscillator circuit is composed of the time-base....
About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use....
The chief advantage of this programmer is its ability to protect both the target and the PC from odd voltages when one side is powered off. The buffers are open-drain, and each is pulled up to the Vcc of the receiving party. The MC74LCX07 has an operating....
This circuit is a circuit diagram digital voltmeter with LED display. It`s ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V....
The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator ...
Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. Low battery voltage....
After dismantling chinese copy of segway I wanted to check how the controller is made. After a couple of hours of work with multimeter, pen, a sheet of paper and Kicad I came up with a block diagram and schematic of motor controller. This motor controller is....
The gas detector designed this time is that have adopted the intelligence taking ARM microprocessor as the core to measure the control equipment, it not merely adopts the internationally advanced one-chip computer microprocessing of 1990s, also have the....
The circuit within the dotted line for a mini emergency light can be incorporated into any battery eliminator, provided the eliminator`s voltage is higher than the battery`s voltage. For greater load (1. e. for more light through a b1gger lamp), Tl should be....
The design of the charger is similar to that of many commercially available chargers. The charger consists of a mains adaptor, two resistors and a light-emitting diode (LED). In practical use, this kind of charger is perfectly all right. Resistor R1 serves....
The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and....
By adding only a few components, you can turn a temperature- and beta-compensated current sink into a common-emitter (CE) amplifier that maintains a stable biased operating point. This Idea for Design will show you how..
This circuit is designed to create an early warning alarm system for any form of theft that are important to the owners of a motorcycle or bicycle. This alarm system can be used a number of normally open switches such as mercury (italics) switch. It works by....
A type of output structure used with integrated circuits in which one transistor drives the output high while another transistor connected below it pulls the output low. Many ICs use Totem-Pole Outputs, in fact it`s so common that the output structure isn`t....
This is a pulse stretcher circuit using optocoupler. This circuit uses a 4N26 opto-coupler combined with a standard one-shot circuitry. This circuit is....
Controlling the speed of a motor is very important in many situations especially in robotics. There are many techniques of controlling the speed of motors, each with their advantages and disadvantages. This document will show you how to build a motor....
Usually, semiconductor laser diodes are operated from current drives. Unfortunately, The output power is strongly dependent on the device temperature ? a...
The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer (T1) and a full wave rectifier (D5 & D6): Zener diode D4 was added to clamp the dc voltage to 15V maximum. Triacs D7, D8 and D9 are insulated from the control circuitry by....
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
The V.U. meter that works with the integrated amplifier circuit.The signal will sound, the audio amplifier circuit into VU meter circuit.And will show the level....
Liquid-crystal displays come in all sorts and sizes, and this applies also to their pinouts. In fact, many of these displays cannot be used properly without the manufacturers` documentation. But, of course, this can never be found when it is needed, and a....
This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation.? Here is...
A very simple LED torch can be designed using the NSI45090JDT4G adjustable constant current regulator (CCR) designed by ON Semiconductor, using extreme few external components. NSI45090JDT4G device is designed to provide a cost effective solution for....
In industrial production, flow measurement is to employ the extensive measurement physical quantity. Under special circumstances, when for instance vertical externally positioned installation probes of difficult pipeline such as the oil well, etc. , need to....
Standard Colpitts oscillator Q1 with emitter-follower Q2 gives dependability and adequate isolation from later stages Zener regulation provides stability even with weak battery Output is about 0. 7 VRMS. Low-level parasitic oscillation may occur about 150....
Series of current pulses are imposed on the structure simulated, and average currents of the 70%~90% section of each curve are calculated, (b) Voltage vs. time curves are obtained from the simulation. And the average voltage of the 70%~90% section of each....
FM transmitter circuit which is build using single chip of MAX2606. A very simple FM transmitter connects your home-entertainment system to a portable radio that will be carried surrounding the house and into the back yard. As an example, it is possible to....
Desulfation is the process of reversing the process of sulfation that occurs to a lead-acid battery over time. Desulfation restores, at least partially, the ability of the battery to hold a charge over the life of the battery originally caused by sulfation)....
