Technical (टेक्निकल)

Difficulty Rating: 5/10 Abstract: This project gives an overview of the Sealed Maintenance-Free (SMF) Lead-Acid Rechargeable Battery charger using 3-pin  IC LM-317 as voltage regulator and opamp IC LM-324. In case of a simple battery charger, when the battery is fully charged and is left plugged in for more than a day or two, the battery may get damaged. In order to protect the battery from this major risk, the proposed battery charger is designed in such a way that the charging current falls gradually as the charging progresses. So the battery can be left plugged into this charger indefinitely, and it won't bother it in the slightest. Designing the Circuit:   Click the image to view the enlarged version The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors, R 2 ’ and R 2 ”  (R 2 ...

IC L293D, is the Motor Driver IC, which is usually linked to Robotics Applications. Even if you tend to use this guy, few basic questions still arouse in the minds of budding Hobbyists; Like Why 2 supply pins on the IC, How much voltage can be given to the IC, Should I short all the Ground pins of the IC ??????  Here, I'll be explaining the Pin description of L293D and not the specifications or other technical details. You can refer datasheet for that. L293D datasheet click here. To start with, any Microcontroller development Board works with a Max. of 5V, with a few hundreds of mA current. In case of ARDUINO Duemilanov: DC Current per I/O: 40mA DC Current for VCC & GND: 200mA  Is this current sufficient enough to drive a everyday 12V, 200RPM DC motor ? No.  So what ? Use a Motor Driver.  Does it help ? Yes. It converts low current to high, sufficient to drive a motor. Pin Conections (Important: Even pro's tend to m...

ORBO V 2.00 to roll during ISTE SAKEC Workshop on 9th March, 2013 ORBO V 1.00 Content of the Workshop: Intro to Robotics What is robotics? How we can use it in day-to day life. Scope of the workshop:- Using ATMega168  processors as bot-brain. Learning about the Arduino environment. Learning about c++ based processing language IDE. Learning about 4 channel RF control. Learning Arduino-Processing interfacing.          PC- Control theory Processing (An open source Electronic Sketchbook) Advantages and scope for robotics. Serial communications. GUI end user facility. Make Your own programs!. Controlling methods - Mouse,Pen tablet. Precision control- Keyboard.              Generic RF module:- Key to open source “hackable”  design. eg. :- Turbo - using the 5th channel. Using the Rf module for other purpose - E.g Controlling the home electrical system contro...

A bunch of these just made an entry into my IC box. S27C64A-20FA is a 64Kb CMOS EPROM (8Kx8), one of the Obsolete Electronic Component manufactured by Signetics. It comes in 28 pin ceramic Dual Inline package (DIP) with Quartz window. 

A device that comes in handy during Mountaineering/Trekking Difficulty Rating: 3/10 Motivation: Using AA pencil cell to power a torch is too mainstream & also power consuming. And if you are a Mountaineer, where torch-light is vital, replacing these cells becomes too much of pain in the ass. Instead, how about a torch which doesn't need cell replacement in the first place?? The chargeable torch-lights (china made), like this one, have become a commonplace in today's Electronics market. Commercial Torch-light (Not mine) But does anyone have a similar torchlight, which has lasted more than a year? So I decided to make one for myself, owing to its use during one of the Mountaineering adventures. My prototype It works just fine !!!!! Hardware: A small pipe, wheel, Long screw (for charging purpose), lots of duct tape, white paper (behind LED) Electronics: 4.8V Li-ion battery, Toggle switch, push-button switch, 9 high-power LED, Dynamo, PCB, 2 Capaci...

Difficulty Rating: 5/10 Hexapod Robot using 12 BO series DC motor (12V-6V and 60RPM) Microcontroller platform is a ARDUINO (clone) using ATMega 328 Used 6 L293D IC's. 1 IC for driving 2 DC motors.

Introducing,  JATAYU  ( जटायु)  a dual-rotor RC chopper. A sweet souvenir from Malaysia!!! Cost: 120 MYR (Approx. 2000₹) As the time flies by, day by day, year by year the focus starts drifting from small battery operated toys to the toy cars, the remote controlled cars....... and eventually lands up on the flying models (In my case). And once  you get totally involved in the hobby, even your wildest imagination cannot stop you from thinking about it. From the busiest hour or in your deepest sleep, its still there, somewhere, what you are most inclined to,  wanted thing of your life. For me its RC Heli...... The First Flight (Also the first crash :p ) A fine sunday morning at Meru Valley, IPOH City Malaysia. Thought, would take Heli for a quick 'morning-flight'. Took the 2 ft. long birdy and kept it on the ground. Slowly moved the throttle stick, and watched as the heli lifts up smoothly. But as it takes off from ground, it runs into a self rot...