Electrinic and circuit

1 800 Oscillator

Oscillators are ten a penny, but this one has something special. Its frequency can be adjusted over a range of 800:1, it is voltage controlled, and it switches off automatically if the control voltage is less than approximately 0.6 V. As can be seen from the chart, the characteristic curve f = f(Ue) is approximately logarithmic. If the input voltage is less than 0.7 V, T1 and T3 are cut off. The capacitor then charges via the 10-kW resistor. The combination of the capacitor, the two Schmitt triggers and T2 form the actual oscillator circuit. However,...

Nokia E 51 Mic Not Working Problem Repair Solutions

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Remote Washing Machine Alert

It is frequently the case in this day and age that the was oncehing computing device and tumble dryer are put in in an outbuilding or nook of a storage. This no longer simplest makes the kitchen a so much quieter location but also leaves room for a dish was onceher and provides extra space for storing. The downside now is the best manner to inform when the used to beh cycle is finished. In dangerous climate you don’t want to make too many fruitless trips down the backyard route just to check if the was onceh cycle is finished. The author...

Inverter Overload Protector

An overload situation in an inverter may permanently damage the energy transistor array or burn off the transformer. Some of the home inverters bought in the market don't function an overload shutdown facility, whereas those incorporating this selection come with a ticket.the circuit presented here is an overload detector which shuts down the inverter in an overload situation. Circuit diagram: Inverter Overload Protector With Delayed Auto Rest Circuit Diagram It hasthe following...

Intelligent Electronic Lock

This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate these switches with different numbers on the control panel/keypad. For example, if you want to use ten switches on the keypad marked ‘0’ through ‘9’, use any four arbitrary numbers out of these for switches S1 through S4, and the remaining six numbers may be annotated on the leftover six switches, which may be wired in parallel to disable switch S6 (shown in the...

Probing Solar Panel Design Systems

Current drawbacks of utilizing solar energy are high initial costs and the inconvenience of high maintenance. Although the use of solar energy has been steadily growing, it is only 0.08 percent of the energy-producing market within the United States.1One of the growing areas in solar research has been the mounting brackets of solar arrays. The goal of this design project is to develop innovative methods for producing an inexpensive mounting system to reduce initial costs of a photovoltaic solar grid. Limited engineering research in this area has kept these panels retailing at the average cost...

Modular Jack Wiring Jack Pins Numbered

Pin Modular Jack Wiring Jack Pins Are Numbered Looking.Terminal The Steps To Wire A Jack As Shown Above Are As Follows.Phone Might Damage The Network Card When The Phone Rings The Wiring.Typical Phone Jack Wiring.Triple Contact Plug Or Trs Plug Or Trs Connector Has Three.Telephone Jack Wiring Dsc09942 Jpg.Wires Inside Most Phone Jacks Are Usually Solid Colored Not.The Following Is A Diagram Of How A Jack Works.We Use A De9f To Rj45 Adapter Part No 01910 From Www Pccables Com To.Zen Vision M Video Cable Other 4 Pole 3 5mm Pinouts Anything Bu...

Vocal Adaptor for Bass Guitar Amp

These days, music is a major hobby for the young and not-so-young. Lots of people enjoy making music, and more and more dream of showing off their talents on stage. But one of the major problems often encountered is the cost of musical equipment. How many amateur music groups sing through an amp borrowed from a guitarist or bass player? This is where the technical problems arise not in terms of the .25” (6.3 mm) jack, but in terms of the sound quality (the words are barely understandable) and volume (the amp seems to produce fewer decibels...

The parts of the Speaker

Basket (frame)Made of a metal plate that will support all parts of the speaker where the speaker of the other speakers can be attached to the intact MagnetHere is used to generate a magnetic field of permanent magnets to be used to drive the voice coil, so as to produce sound.Parts of speakerVoice CoilVoice Coil is an important part of a speaker. Voice coil consists of Robbin (where rolled coil) and coil (the coil BWR - Brass Wire Rope), Coil is going to move in accordance with the signal diterirna.Spieder or DamperSpider or suspension dampers are used...

Build A Synchronous Clock

The quartz clocks which have dominated time-keeping for the past 20 years or so have one problem: their errors, although slight, are cumulative. After running for several months the errors can be significant. Sometimes you can correct these if you can slightly tweak the crystal frequency but otherwise you are forced to reset the clock at regular intervals. By contrast, mains-powered synchronous clocks are kept accurate by the 50Hz mains distribution system and they are very reliable, except of course, when a blackout occurs. This circuit converts a quartz...

25W Audio Power Amplifier Rise

This audio power amplifier project is based on LM1875 amplifier module from National Semiconductor. It can deliver up to 30W of power using an 8 ohm load & dual 30V DC power supplies. It is designed to operate with maximum outside parts with current limit & thermal shutdown protection features . Other features include high gain, quick slew rate, wide power supply range, giant output voltage swing & high current capability.Summary of the audio amply-fire features:Low distortion: 0.015%, 1 kHz, 20 WWide power bandwidth: 70 kHzWide supply range...

Design a Subtractor

A basic differential amplifier can be used as a sub-tractor. We can get the difference of two input voltages in the output of op-amp as output voltage. The circuit diagram of a basic differential amplifier is drawn below. This is a linear bilateral network. So, applying super position theorem, we can find the output voltage equation. Let, assume that only...

Alternator Wiring

Marine Alternator Diagram Mando Alternator Wire Marine Alternator.Alternator Wiring Question Page 1 450965.Alternator Regulator Troubleshooting.Please Note The Fuse Wire Connected To The Starter Solenoid And Not.Do This An Nothing Else.68 Charging At 14 8v And Acid Leaking From The Battery Vintage.Ls1 Alternator Wiring.Alternator Bracket For The Top Mounting About 15 On Line The Wiring.12v Marine Tachometer Diesel Alternator Wiring Instruction Jpg.1994 Saturn Sl2 Problem New Alternator Bad Electrical 4 Cyl Fron...

First Order Band Pass Filter

Application of first order band pass filter to find out the output voltage gain magnitude of specific frequency. A specific range of frequency can pass through the amplifier which has a specific bandwidth of this band pass filter. A band pass filter is a frequency selector. It allows one to select or pass only one particular band of frequencies from all other frequencies that may be present in a circuit. This type of filter has a maximum...

Remote toggle switch circuit

The only difference is in the approach. This circuit is designed by using another method. Using this circuit you can toggle any electrical appliance between ON and OFF states by using your TV remote. The only requirement is that your TV remote should be operating in the 38 KHz. The IC1 (TSOP 1738) is used to receive the infrared signals from the remote. When no IR signal from remote is falling on IC1, its output will be high. When the IR signal from the remote falls on the IC1, its output goes low. This triggers the IC2 which is wired...

How to repair Nokia 5610 keypad fail problem

For nokia 5610 keypad can not function normally1. Check and clean keypad and doomsheet first2. If the problem not solved, check flex cable, replace if needed3. If the problem still not solved , check asip emif keypad and replace if needed.4. If the problem still not solved, track circuit for broken lin...

Heart Rate Monitor

Strictly speaking, this simple circuit shouldnt work! How could anyone expect an ordinary light dependent resistor photo cell to see through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates? The secret is a high gain circuit, based on a dual op amp IC which can be either the low power LM358 or the JFET TL072. The LDR is connected in series across the 9V battery supply via a 100kO resistor (R1) and the minute signal caused by the blood pulsing under the skin is fed to the non-inverting (+) input, pin...

Garage Timer Circuit Diagram

The circuit described here is a testament to the ingenuity of two young designers from a specialist technical secondary school. The ‘garage timer’ began as a school electronics project and has now made it all the way to publication in our Summer Circuits special issue of Elektor Electronics. The circuit demonstrates that the application possibilities for the 555 and 556 timer ICs are by no means exhausted. So what exactly is a ‘garage timer’?When the light switch in the garage is pressed, the light in the garage comes on for two minutes. Also,...

Morning Alarm Circuit Diagram Using LDR

Description Circuit showing a morning alarm.Here we have used a switching transistor.When the sun rise up ldr is low resistance so the ldr is conduct and a positive volt coming to the base of the Q1 there for the transistor will switch.This time the buzzer is ON . Adjust the preset control the intensity of light.Manually cut off the power.Are you interested please comment and join this siteComponent Required Resistor 4.7k...

Security Alarm

Thwart any attempt of burglary in your house using this alarm circuit. When someone opens the door of your room, it sounds an alarm intermittently and flashes light as well. The circuit can also be used as an audio/visual alarm in case of fire or other emergency by momentarily pressing switch S3. The circuit (refer Fig.1) is built around transformer X1, a standard bar magnet, reed switch S2, timer IC NE555 (IC1), opto-coupler IC MOC3020 (IC2), TRIAC BT136 and a few discrete components. Timer IC1 is wired as an astable multi-vibrator whose reset pin 4 is...

500W Low Cost 12V to 220V Inverter

Note :This Circuit is using high voltage that is lethal. Please take appropriate precautionsUsing this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. How to calculate transformer rating The basic formula is P=VI and between input output of the transformer we have Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have...