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This Simple Cmos Motorcycle Alarm Circuit Diagram features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike - flash the lights etc.

Any number of normally-open switches may be used. Fit "tilt" switches that close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc.

Once activated - the rate at which the siren switches on and off is controlled by R9 & C5. For example - increasing the value of C5 will slow it down - while reducing the value of R9 will make it faster.

While at least one switch remains closed the siren will sound. About thirty seconds after all of the switches have been opened, the alarm will reset. How long it takes to switch off depends on the characteristics of the actual components used. You can adjust the time to suit your requirements by changing the value of R6 and/or C4.

The circuit is designed to use an electronic Siren drawing 300 to 400mA. It's not usually a good idea to use the bike's own Horn because it can be easily located and disconnected. However, if you choose to use the Horn, remember that the alarm relay is too small to carry the necessary current. Connect the coil of a suitably rated relay to the "Siren" output. This can then be used to sound the Horn - flash the lights etc.

The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Connect the 1-amp in-line fuse AS CLOSE AS POSSIBLE to your power source. This is VERY IMPORTANT. The fuse is there to protect the wiring - not the alarm. Exactly how the system is fitted will depend on the make of your particular machine - so I'm unable to provide any further help or advice in this regard.

The quiescent (standby) current of the circuit is virtually zero - so there is no drain on the battery. If you want to operate the alarm manually use a key-switch or a hidden switch connected to the "off/set" terminals. For automatic operation connect a wire from the ignition circuit to the "ignit" terminal. Then every time you turn-off the ignition - the alarm will set itself. Remember that this wire from the ignition switch is not protected by your 1-amp inline fuse. So unless its run is very short - fit the wire with its own 1-amp fuse as close as possible to its source.

When you set the alarm - if one of the switches is closed - the siren will sound. This could cause annoyance late at night. A small modification will allow you to Monitor The State Of The Switches using LEDs. When the LEDs are all off - the switches are all open - and it's safe to turn the alarm on.

This is a Simple Power Pulse Using by LM350 and NE555 Circuit Diagram. This circuit can use to drive lamp,power LED,DC motor etc. Adjust R5 for output amplitude.Adjust R1 for output power .

Nikon’s latest Coolpix cameras focus on durability and versatility, the waterproof, shockproof and freeze-proof AW120 leads the way 

Nikon has announced seven new Coolpix cameras sporting a variety of features to complement different lifestyles from rough and rugged to slim and stylish.

The Coolpix AW120 leads the pack with a 16-megapixel camera and is waterproof to 18m, shockproof to 2m and freeze-proof to -10°C for £329.99. 

Meanwhile the 13-megapixel Coolpix S32 is an easy-to-use camera that’s shockproof, dustproof and waterproof for an active family lifestyle for just £99.99.

The high performance entries on the lineup are the Coolpix P600 and super-zoom P530.

Both cameras are compact with high zoom power and include a built-in electronic viewfinder that allows you to snap photos on the move.

The Coolpix P600 will set you back £429.99 whilst the P530 costs £329.99.

Nikon has also released the stylish Coolpix S9700 and S9600 cameras with built-in WiFi so you can upload and share images via your smart device which can also act as a remote control for the camera.

The S9700 is priced £329.99 whilst the S9600 is cheaper at £249.99. 

The last of the lot is the compact 12-megapixel Coolpix P340 that also comes with built-in WiFi for £349.99.

Apart from the P530 that arrives on February 13, the Nikon Coolpix range will be available February 27.

In a press statement released by Sony, the company said that it is selling off its VAIO brand and concentrate more on smartphones and tablets, citing “drastic changes in the PC industry”. Japan Industrial Partners (JIP) will take over the business, with the deal expecting to be completed by the end of July this year. 

The statement also said that Sony will “immediately cease planning, design and development of PC products”. It also said that manufacturing and sales will be discontinued after they release their Spring 2014 lineup. Sony also assured customers that they will still get after sales support even if the deal has been completed.

Always associated with elegant design, the VAIO line of notebooks has always been one of the preferred brands by some, including Steve Jobs – to which he even envisioned VAIOs running on Mac OS X.

While rumours have started to swirl over whether or not Samsung will reveal their much-anticipated Galaxy S5 smartphone at Mobile World Congress later this month, the organizing committee has confirmed that they will indeed.

The game Flappy Birds skyrocketed into the charts of app stores both on iOS and Android, and somehow created a fuzz for users everywhere. The game required you to simply tap on the screen to make the bird fly through obstacles but it is somehow met with frustration since most users can barely even get a score of one. The gameplay made it a trending topic on Twitter for days, along with everyone sharing their own scores and achievements.

Even with the game pulling in about $50,000 on ad revenues per day, its maker, Dong Nguyen has had enough of it. Mentioning that "he can't take [the game's popularity] it anymore," he pulled out the game from the Apple App Store and on Google Play, so if you haven't downloaded it, you're out of luck.

Now, one user on eBay has decided to sell a used iPhone 5S with the game pre-installed. The catch? He is selling it for $99,900 USD (367,000 AED). At the time of writing, the phone now has 74 bids and a quick look at the seller's profile shows he has gotten positive feedbacks previously.

eBay tells us though that it may not ship in the United Arab Emirates, in case you are interested.

This is a one watt home stereo amplifier module project using the KA2209 IC from Samsung, which is equivalent to the TDA2822. It operates from 3-12V DC & will work from a battery since the dormant current drain is low. It requires no heat sink for normal use. The input & output are both ground referenced. Maximum output will be obtained with a 12V power supply & 8 ohm speaker, however it is suitable for driving headphones from a supply as low as 3V.

The Specifications of the home stereo amplifier :

D.C. input : 3 – 12 V at 200 – 500 mA max
Idle current : approx. 10 mA
Power output : > 1 Watt max. 4-8 ohms, 12V DC
Freq. Resp. : approx. 40 Hz to 200 kHz, 8 ohm, G=10
THD : < 1 % @ 750 mW, 4-8 ohm, 12V
Gain : approx. x10 (20 dB) OR x100 (40dB)
S/N ratio : > 80 dB, G = 20 dB
Sensitivity : < 300 mV, G = 20 dB
Input Impedance : approx. 10 k ohm

Description 

The gain is adjustable from ten to 100, i.e. twenty to 40 dB. Start with feedback resistors R1 and R3 of 1k ohm, this will give a gain of ten which ought to be adequate for most applications. In case you need more gain, you can remove resistors R1 and R3.This will give a gain of about 100, or 40 dB.The input attenuation can be adjusted by the potentiometer which can be used as a volume control. The IC gain ought to be kept as low as necessary to accomplish full output, with the in put potentiometer and your signal source at maximum.

1 W Home Stereo Amplifier Circuit Diagram

Voltage Gain = 1+ R1/R2 = 1+R3/R4, however the maximum gain with no outside feedback is about 100, or 40dB. (GdB = 20log Gv)

This will keep the signal to noise ratio as high as feasible. Additional gain provided by the amplifier will reduce the S/N ratio by a similar amount, since the input noise figure is constant. Other values for R1 and R3 of between 1k and 10k ohm can be used if an intermediate gain level is necessary.

If driving a pair of headphones, you may also need a 100 ohm resistor in series with each output to reduce the output level, depending on headphone impedance & sensitivity. Make positive you start with the volume right down to check. Numerous headphones may be driven from the amplifier in the event you wish, since most headphones have at least 16 ohm impedance, or more often 32 ohm.

There are only a few outside parts, the IC contains most of the necessary circuitry. R1,R2 and R3,R4 are the feedback resistors. C1 provides power supply decoupling. C2 and C3 are the input coupling capacitors, which block any DC that might-be present on the inputs. C4,C5 block DC in the feed back circuit from the inverting inputs, and C6,C7 are the output coupling capacitors. C8, R5 and C9,R6 act as Nobel networks providing a high frequency load to maintain stability at frequencies where loud speaker inductive reactant may become excessive. The pot provides adjustable input level attenuation.