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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...

There seems to be alot of interest in making home made stun guns these days. Some things need to be said before we go any farther. Home made stun guns like any home made device could be hazardous! Home made devices are fun to build and play with, but use at your own riskI. If you doubt your skills, or need some thing more powerful and dependable, click on a link and have a look around There is a huge difference between a Stun Gun and a Taser, a stun gun is a contact weapon and a taser fires darts attached to wires. We are Talking about a Stun Gun Here. If you want to learn more about a Taser but. If you are still wanting to build your own stun gun than lets get started. Assembly of a home made stun gun The main piece of equioment needed is a disposable camera, make sure it is one with a flash. #1- carefully open the casing of the camera, but be careful not to damage anything in the process. #2-Take out the battery to prevent being shocked in case of accidental discharge. #3-You will ne...

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...

New Delhi: While Samsung is highly expected to show off its new Galaxy Note smartphone on September 4, a new report from Bloomberg claims that the South Korean giant will also unveil its long-rumoured smart watch, unofficially dubbed 'Galaxy Gear', at the September 4 event.  Citing two people familiar with the matter, the report says that the smart watch can make phone calls, surf the Web and handle e-mails. The Galaxy Gear smartwatch will be powered by Google's Android OS and is likely to go on sale this year.  Samsung Electronics has already applied for US and South Korean trademarks for a watch that connects to the Internet in the latest sign that consumer technology companies see wearable devices as the future of their business.[via]