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PARTSIM http://www.partsim.com SPICE Simulator AC/DC/Transient Sims Waveform Viewer Simulation Features   -  PartSim includes a full SPICE simulation engine, web-based schematic capture tool, and a graphical waveform viewer.  Browse Examples  -  Try out a sample simulation and see  PartSim in action. No registration is  required. Browse Examples Digi-Key Integration  -  PartSim includes an integrated Bill-Of-Materials manager that lets you assign  Digi-Key Part Numbers to your models. CIRCUITLAB https://www.circuitlab.com/ Choosing the right design tools makes your job easier. Design with our easy-to-use schematic editor. Accurate analog & digital circuit simulations in seconds. Professional schematic PDFs, wiring diagrams, and plots. No installation required -- try it instantly. DOCIRCUITS http://www.docircuits.com Build Circuits -Have fun building and burning circuits Over 541238 Simulations Share - Your Design with community Test ...

This is a complete alarm system with 5 independent zone ssuitable for a small office or home environment. It uses just 3CM IC`s and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a“system armed” indicator. The schematic is as follows: 5 Zone alarm Circuit Diagram Circuit Notes: Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches).Suitable switches can be bought from alarm shops and concealed indoor frames, or window ledges.Zone 1 is a timed zone which must be used as the entry andexit point of the building. Zones 2 – 5 are immediate zones,which will trigger the alarm with no delay. Some RF immunity isprovided for long wiring runs by the input capacitors, C1-C5. C7and R14 also form a transient suppresser. The key switch acts asthe Set/Unset and Reset switch. For good security thisshould be the metal type with a key. Operation: At switch on, C6 will charge via...

An increasing number of appliances draw a very small current from the power supply. If you need to design a mains-powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance’s total power consumption is very small? Transformer-based power supplies are bulky, while the switchers are generally made to provide greater current output, with a significant increase in complexity, problems involving PCB layout and, inherently, reduced reliability. Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant...

Regulated Power Supply This project is a normal DC regulated power supply that is a variable DC voltage range from 5V to 15V. It can supply current up to  400mA to power the various circuits for your electronic projects. The voltage output is varied by using the potentiometer V.R1. In this circuit, the input line power supply is designed for 240V.A.C. If 110VAC input is used, alter the ratings of the varistor to 150VAC & the transformer ratio to 110V/12V.  Fuse F1 is used as a protection in case there's any short circuit in the circuit. Varistor V1 is connected in parallel to the input of the line voltage to clamp the surge voltage from the line to a reasonable level that helps to protect the transformer & other circuitry. One time the voltage level surge to a high level beyond the ability of the varistor to absorb it, fuse F1 or varistor V1 or both will burn. If this circuit failed after a period of operation, check that the fuse & the varistor are still in nice c...

Apple finally launched iPhone 5, 2012’s most awaited gadget, at a highly anticipated event in San Francisco. The iPhone 5 is 18% thinner and 20% lighter than the iPhone 4S. It is the thinnest smartphone in the world with a casing made from glass and aluminium, according to Apple. iPhone 5 will run on Apple’s new operating software iOS 6. With a four-inch Retina Display screen, the iPhone 5 allows for five rows of apps — one more than previous versions of the device, which sported a 3.5-inch screen. Apple iPhone 5 features a retina display and the screen will have a 1136 x 640 screen resolution, with a 16:9 aspect ratio. Apple has also unveiled a brand new chipset for the iPhone 5: the quad-core Cortex A6 processor, which Schiller says is a full two times faster than the A5 chip in the iPhone 4S. There are also now three microphones in the mix: one on the front, one on the back, and another on the bottom. It sports an 8MP rear camera with panorama mode, backside illumination, hybrid IR ...

5 Most Exciting Gadgets for 2014 . 2014’s shaping up to be another game-changing year for tech. Once again, smartphones and tablets are set to become shaper, faster and cooler. But beyond those staples of the scene, there are some hugely exciting new pieces of kit. Apple iPad Pro HTC M8 Apple iWatch Samsung Galaxy Round 2 Nintendo Android tablet

This is a Simple1.5.4.5V to 9V Converter Circuit Diagram. Build a Simple1.5.4.5V to 9V Converter Circuit Diagram. 1.5.4.5V to 9V Converter Circuit Diagram

This Simple 5 Digit Alarm Control keypad Circuit Diagram switch will suit the Modular Burglar Alarm circuit.However, it also has other applications. 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 with7 terminals will NOT do. Choose the five keys you want as your code, and connect them to `A, B, C, D & E`. 5 Digit Alarm Control keypad Circuit Diagram Wire the common to R1 and all the remaining keys to `F`. Because your choice can include the non-numeric symbols, almost 100 000different codes are available. The Alarm is set using the first four of your five chosen keys. When `A, B, C & D` are press edin the right order and within the time set by C1 and R2 (about10 seconds), current through R11 switches Q6 on. The relay energizes, and then holds itself on by providing base current forQ6 through R12. The 12-volt output switches from the “off” to the “set ” terminal, and the LED lig...

This is a Variable 5 to 20V DC Supply Circuit Diagram . If you are looking for a low drop voltage regulator that can provide a power supply of 1A with an output voltage of between 5V and 20V DC, National Semiconductor LM2941 Low Dropout Adjustable Regulator is that you can pick to make use of. It's a typical dropout voltage of 0.5V which means that the input supply need only must be 0.5V DC over the desired output voltage.  Variable 5 to 20V DC Supply Circuit Diagram   Its other features include internal short circuit current limit and reverse battery protection. As shown in the schematic below, the regulator has five pins which consists of the ON/OFF control, Input Voltage, Output Voltage, Ground & Adjustable pins. ON/OFF is used for the purpose of switching on & off of the regulator. The capacitors C1 & E1 are to be placed as close as feasible to the regulator.  The output of the circuit can be varied by varying the worth of potentiometer VR1 from 5V DC to 2...

    As you know, the Android operating system update to the latest version 5.0 Lollipop has already begun to arrive on mobile devices. In addition, a number of manufacturing companies have already confirmed their plans to release updates for their models. So, HTC announced that an update for its devices will be released within 90 days of receipt of the updates from Google. This applies to those cases where the need to refine the interface HTC Sense, however, the models Google Play Edition, which are offered at no additional interfaces, OS updates may well come out faster. HTC has announced that its Google Play Edition smartphones will be updated Android 5.0 Lollipop next week. Though not reported, which device will receive the new version of the first platform - HTC One M8, or last year's model M7. It is not excluded that the update will receive both a smartphone at the same time - in any case, it will be known next week.

Descriptipn: A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps.   Circuit diagram Notes: Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values. Also a low leakage type capacitor must be used for C1, and I would strongly suggest a Tantalum Bead type. Switch 3 adds an extra resistor in series to the timing chain with each rotation, the timing period us defined as :- Timing = 1.1 C1 x R1 Note that R1 has a value of 8.2M with S3 at position "a" and 49.2M at position "f". This equates to just short of 300 seconds for each position of S3. C1 and R1 through R6 may be changed for different timing periods. The output current from Pin 3 of the timer, is amplified by Q1 and used to drive a relay. Parts Relay 9 volt coil with c/o contact (1) S1 On/Off (1) S2 Start (1) S3 Range (1) IC1 7555 (1) B1 9V (1) C1 33uF...

This is a Simple1.5.4.5V to 9V Converter Circuit Diagram. Build a Simple1.5.4.5V to 9V Converter Circuit Diagram. 1.5.4.5V to 9V Converter Circuit Diagram

This solid-state push-pull single-ended Class A circuit is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6.9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better linearity. Voltage and current required for this circuit are 24V and 700mA respectively, compared to 250V HT rail and 1A @ 6.3V filament heating for valve-operated amplifiers. The only penalty for the transistor operated circuit is the necessity of using a rather large Heatsink for Q2 and Q3 (compared to the maximum power delivered).In any case, the amount of heat generated by this circuit can be comparable to that of a one-valve amplifier. An optional bass-boost facility can be added, by means of R5 and C5. 5 Watt Class-A Audio Amplifier Circuit diagram Parts: P1 = 47K R1 = 100K R2 = 12K R3 = 47K R4 = 8.2K R5 = 1.5K R6 = 2.7K R7 = 100R R8 = 100R R9 = 560R-1/2W R10 = 1R-1/2W Q1 = BC560 Q2 = BD439 Q3 = BD439 C1 = 10uF-63V C2 = 10uF-6...

Actually, 5.1 channel amplifier consists of 6 amplifiers 1 channel mono, which has certain specifications on each canals. Has 6 channel surround sound amplifier that consists of Front Left | Center | Front Right | Rear Left (Left Surround) | Rear Right (Right Surround) | and LFE (Subwoofer). For clarity I give a simple illustration of the layout and the circuit for these speakers. 5.1 Speaker Setup Accoustic Field Generator Acoustic Field Generator is generating acoustic sound with surround effects are adjustable with a standard Dolby Surround, able to produce surround sound is good enough but not too much need of funds. Technological developments as if not only focused on one area alone but on all fronts. The development of technologies that exist today one of them is in the field of audio. With more advanced audio technology today not only as mere entertainment but has become a hobby, hobby is not cheap of course. Many audio enthusiasts trying to make music sound t...

This amplifier circuit or with it based on ic KA2210 main amplifier, audio amplifier circuit should disupplay minimum of 10 Volt and up to 16 volts. Power output is 2 x 5.5 W stereo amplifier att. By using this amplifier you can listen to the strains of songs from mp3 player, iPod, etc. This is schematic diagram Part List R1 = 4.7R R2 = 4.7R C1 = 1uF C2 = 100uF C3 = 47uF C4 = 100uF C5 = 0.1uF C6 = 1000uF C7 = 1uF C8 = 100uF C9 = 47uF C10 = 100uF C11 = 0.1uF C12 = 1000uF IC = KA2210