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The 60 Hz inverter shown below is about as simple to make and as inexpensive as one could desire. Yes, it is capable of providing some very useful services. Operating from an automobile battery, it can supply 50 W for the operation of such devices as an ac-dc radio, electric shaver, fluorescent lamp, small soldering iron, 40 W incandescent lamp, recorder, or portable phonograph. Its essential ingredients are a filament transformer and two general-purpose germanium power transistors. Although this is a saturable-core oscillator, no separate feedback windings are employed. Rather, feedback is produced by cross-coupled connections in the manner of a multivibrator. At a full load, the efficiency is in the vicinity of 75 percent, and the output voltage is about 106 V. The "mild" pi-section filter despikes the output waveform and causes a trapezoid wave, rather than the usual square wave, to be available at the output. This makes the device more suitable for the operation of radios...

The family of Eddie Smith has auctioned off their late father's 1967 Ferrari 275 GTB/4*S N.A.R.T Spider, and generously donated all the proceeds to charity. The rare car (only 10 were ever made) was sold Saturday night at RM Auctions in Monterey, Calif., for $27.5 million. That price set a new world record for the most expensive road car of any kind sold at auction.  Smith took ownership of the Ferrari in 1968, and his son, Eddie Smith Jr., told the auction crowd that selling it was "a bittersweet moment." According to the Los Angeles Times, he advised its new owner to "Drive it, love it, enjoy it, and more importantly share it with others so they can see it." [Source] [Source  ] Trending topic: ferrari auctioned | Click to see more on msnNOW.com

Because of energy crisis Load shedding may be a common problem in several countries.. Sudden power fluctuations, surge and high voltage may spoil sophisticated household appliances like TV, VCR, VCP and music system. This circuit provides protection against these problems and automatically changes the power supply from Generator output to mains supply and also switches off the generator. Circuit descriptions This circuit is self explanatory. When lines supply voltage crosses the preset level, Zener diode ZD4 break down and thus transistor T2 conducts, T3 does not conduct, causing the relay to de-energise. Voltage surge at the time of power resumption is protected by the delay circuit around transistor T1. All the portable petrol and kerosene generators have a connection from CDI. To stop the engine of the generator-set, this connection is to be grounded momentarily (through the switch). This lead is to be connected with the ground through the N/C point of the relay. Auto Changeover ...

Simple high efficiency Colpitts oscillator .In the higher frequency ranges, above 50 MHz, Colpitts oscillators are used because stray circuit capacitance will be in parallel with desired feedback capacitance and not cause undesirable spurious resonances that might occur with the tapped coil Hartley design. Simple 50 to 300 MHz Colpitts Oscillator Circuit Diagram The FM VCO shown is a grounded base design with feedback from collector to emitter. A Colpitts oscillator is one of a number of designs for electronic oscillator circuits using the combination of an inductance with a capacitor for frequency determination.As you can see in the circuit diagram , this electronic project require few electronic parts an provide a 50 MHz-300MHz VCO with a tuning range of 2:1 .

There are monitors which only have three BNC inputs and which use composite synchronization (‘sync on green’). This circuit has been designed with these types of monitor in mind. As can be seen, the circuit has been kept very simple, but it still gives a reasonable performance. The principle of operation is very straightforward. The RGB signals from the VGA connector are fed to three BNC connectors via AC-coupling capacitors. These have been added to stop any direct current from entering the VGA card. A pull-up resistor on the green output provides a DC offset, while a transistor (a BS170 MOSFET) can switch this output to ground. It is possible to get synchronisation problems when the display is extremely bright, with a maximum green component. In this case the value of R2 should be reduced a little, but this has the side effect that the brightness noticeably decreases and the load on the graphics card increases. To keep the colour balance the same, the resistors for the other two colo...

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 1.5.4.5V to 9V Converter Circuit Diagram

How to Use a Fire Extinguisher Fire extinguishers are handy and very easy to operate. There are different designs of them and each has its own ways of operation depending on the manufacturer. It is important to be familiar with the instructions printed on each design instead of waiting until fire breaks out, which generally are: a.         Hold the extinguisher upright, then remove the safety pin or cap. b.        Direct the nozzle to the base of the flame. c.         Press the level or strike the knob. d.        Spray the base of the fire. After use fire extinguishers should be sent back to the manufacturer for refilling. They also need to be inspected regularly to ensure they will be effective when needed. Every workshop should have fire extinguishers. They should be placed in an easily accessible position, such as near the doors and where a fire is most li...

Simple Sound-to-Light Converter Schematic Diagram Figure 1 shows a simple ambit for converting an audio arresting (such as one that comes from the apostle terminals of a CD player). The ambit basically consists of a buffer/amplifier date and three clarify circuits: a high-pass filter, a mid-pass filter, and a low-pass filter. The achievement of anniversary clarify ambit drives a light-emitting diode of altered color. The ascribe arresting is fed to the absorber date through C1. The ethics of RF and RV1 should be called so that the absorber is able to drive the three filters absorbed to its output. The low-frequency, mid-frequency, and high-frequency apparatus of the ascribe arresting are alone accustomed to canyon through the low-pass clarify (bottom filter), the mid-pass clarify (middle filter), and the high-pass clarify (topmost filter), respectively, appropriately amid them from anniversary other. Changes in the achievement of a clarify account its agnate achievement LED to abo...

If users don't update their Windows Phones to 7.5, they won't be able to access Marketplace. (Credit: Josh Miller/CNET)    Anyone with a Windows Phone that hasn't been upgraded to version 7.5 won't be able to use Microsoft's Marketplace app store as of today. Microsoft announced today that in order to download, buy, update, or review apps in Marketplace, users have to be running Windows Phone 7.5. This change is required for both the phone and web Marketplace storefronts. "Most phones are already running Windows Phone 7.5, which was released last fall, and so most of you won't notice anything different about how the Marketplace works," Microsoft's director of program management, Mazhar Mohammed, said in a blog post today. "However, if your phone has an earlier version of our software installed, you'll soon start seeing an error message when you try to download a new app, or update one you already own."

This is a 500W DC-to-AC inverter circuit diagram which produces an AC output at line frequency and voltage. 12VDC to 220V 50Hz inverter circuit will power 220V or 110V appliances from 12V car battery. The circuit is easy to make and is low cost. Use proper transformer. The output (in watts) is up to you by selecting different power rating transformer and power transistor rating. If you load electronic device which require 120V AC, then use transformer with 120V in output

Simple animation to explain complex principles - Electronics 1, aircraft radial engine 2, oval Regulation 3, sewing machines 4, Malta Cross movement - second hand movement used to control the clock 5, auto change file mechanism 6, auto constant velocity universal joint 6.gif 7, gun ammunition loading system 8 rotary engine - an internal combustion engine, the heat rather than the piston movement into rotary movement # Via World Of Technology. HowStuffWorks see from the attached three car engine diagram: 1, inline engine - it's cylinders lined up side by side 2, V-type engine - cylinder arranged at an angle of two plane 3, boxer engine - cylinder engine arranged in two planes relative By Geethalakshmi,

The circuit was designed to build a Regulated Power Supply with Stability at 3A will provide a regulated voltage from 40 V to 70 V in a 3 A current. 2N3055 – a complementary Silicon Epitaxial-Base planar NPN transistor mounted in Jedec TO-3 metal case for use as power transistor. BD243 – an epitaxial-base Silicon NPN transistor intended for wide variety of high speed switching and power amplifier applications such as series and shunt regulators, and driver and output stages of high-fidelity amplifiers. BC303 – a PNP silicon planar epitaxial transistor used for AF drivers & outputs, for AF medium power amplifiers, and for switching applications up to 1 A. There are times when some applications are requiring a regulated power supply that has relatively high output voltage and stability. All of these features are being attained in the design of this circuit. The voltage output of the circuit can range from 40 V up to 60 V while carrying a current of 3 A while providing stabilization...

Free circuit dot com would like to present the frequency counter circuit uses IC MK50398 main operation and a multiplexed seven segment display and uses timer 1 to count edges of the input signal. The circuit uses the easier method of direct frequency measurement that is simple to do but means that the number of digits displayed depends on the input frequency. The MK50398 is the one modern decimal counter up/down of six tens IC, with control of screen LED of seven segments and flip-flop of storage. Counter it can measure additive and abstractively. The IC MK50398 is ideal for manufacture frequency counter as the particular circuit.   Components part list IC3=MK50398 IC1-2-4=4093 IC5-6=4017 IC7=Not exist IC8=7812 TR1=220V-110Vac / 12V 0.5A R1=10Kohm R2-8=1Kohm R9=8.2Kohm R10=10Kohm R11=22Kohm R12=10Kohm C1-6=1nF 100V C2-3=150pF 100V C4-5=150pF 100V C7=47uF 25V C8-9-12=100nF 100V C10=1000uF 25V C11= 470nF 100V D1=12V 0.5W Zener D2=1N4148 . LD1-6 =7 segment Display Common Cathode D3-...

Inductorless 3-to-5 Volts Converter Circuit Diagram. By configuring a comparator and a transistor to control the oscillator in a charge pump circuit, you enable the pump to generate a regulated output of in principle any desired value. Charge pump ICs can either invert or double an input voltage (for example, 3 V to –3 V or 3 V to 6 V). The charge pump itself does not regulate the output voltage and one running off 3 V is not normally capable of generating intermediate output voltage levels like 5 V. However, by adding a comparator and a reference device, you can create arbitrary output levels like 5 V and regulate them as well. Inductorless 3-to-5 Volts Converter Circuit Diagram Charge pump IC1 (a MAX660) has an internal oscillator whose 45 kHz operation transfers charge from C1 to C2, causing the regulated output to rise. When the feedback voltage (pin 3 of IC2) exceeds 1.18 V, the output of comparator IC2 (a MAX921) goes high, turning off the oscillator via T1. The comparator hyste...

A very common guitar upgrade is to swap out crappy, cheapo, open-backed (or “stamped”) tuners and replace them with better, enclosed die-cast tuners. I’d like to show you how to do that, and point out a few potential dangers along the way. The example shown uses an acoustic guitar with 3-a-side tuners, but you could follow the same process for an electric, be it 3-a-side or 6-in-line. Click on any of the images to see bigger versions. Here’s the patient. The guitar itself plays well and sounds pretty good, but the tuners have become almost impossible to turn, so it’s time for a change. Although these may look like enclosed tuners, they are simply open-backed tuners, with nothing more than a back cover, which doesn’t even stop dust from getting in. Decent enclosed tuners can be had very cheap these days. This particular guitar didn’t really warrant Schaller or Grover tuners, but the replacement no-name tuners it is about to receive are a huge improvement over what was there before. I sh...

                                     This is the circuit diagram of adjustable symmetric 1 to 24VDC, 1A Power Supply. This power supply give dual output positive and negatif output, you can adjust both positif and negative output (+1 to +24VDC and -1 to -24VDC). This kind of power supply also known as dual polarity power supply or splitted power supply which give positive anf negatif output. This power supply can be used for universal usage, which required not more than 1A DC current. Please take a note that you should adjust the output voltage using general multimeter or DC voltmeter before use this power supply to protect the supplied devices. Circuit Features: Low cost universal symmetric power supply Just add a suitable transformer and a heatsink Ideal for e.g. op-amp applications, amplifiers, … Trimmers...

This circuit will provide a very stable "Square Wave" Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various "off the shelf" transformers can be used. Or Custom wind your own FOR BEST RESULTS. Additional MosFets can be paralleled for higher power. It is recommended to Have a "Fuse" in the Power Line and to always have a "Load connected", while power is being applied. The Fuse should be rated at 32 volts and should be approximately 10 Amps per 100 watts of output. The Power leads must be heavy enough wire to handle this High Current Draw! Appropriate Heat Sinks Should be used on the RFP50N06 Fets. These Fets are rated at 50 Amps and 60 Volts. ** Other types of Mosfets can be substituted if you wish. The LT1013 offers better drive that the LM358, but its your choice. The Power transformer must be capable of handling the chosen wattage output. Also, Appropriate Heat Sinks are Necessary on the Mos-Fets. Us...