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The idea behind this post is to bring together some robot designs and transform them in a new device with new hardware and standard software (arduino of course) and so easier to use.  These robots have three things in common: a mechanical structure, the hardware and the software. While the mechanical part is necessarily different. We wanted to understand if there was a hardware board that could be common, with a unique development system. The choice, quite obviously, has the Arduino board, which with its development environment is perfect to create similar projects. [ ]

Description This one is a high power long range (use yagi antenna)  FM Transmitter  that provides very good frequency stability in about 1km range and very good microphone sensitivity. It can be used inside guitars, as a part of remote control systems or in other similar applications. The features said above are achieved by including an RF amplifier stage with 10dB gain and AF preamplifier stage to boost the modulation. Description The circuit construction is simple. L1 is integrated into the PCB with 3.25 turns. Transistors are not critical. The BC547s can be replaced with any small signal NPN type transistor and BC557 is a general purpose PNP transistor so it can also be replaced easily. The power consumption is low. The finished circuit draws about 30mA. A single 9V battery is ample to power the FM wireless microphone. The PCB file is given in the download section of the project page. You should check Harry's page for more detailed information about the components, PCB modi...

Cheap electronics component for amplifier application, it is simple to be made for speaker active . The sound quality even this  Mini Amplifier TDA2030 quite satisfactory for a portable audio system. "The series of Mini Amplifier TDA 2030 "The series of mini amplifie can reproduce the power output of 14 Watt with 8 Ohm speaker load. The series of mini-amplifier can be supplied with ource voltage of 12 volts - 15 volts DC. more details, see the following series of pictures. Daftar komponen Resistor: - R1: 150KΩ - R2: 4.7KΩ - R3: 100KΩ - R4: 1Ω 1W - RA/RB: 100KΩ Capacitor - C1: 1µF / 25V - C2: 2.2µF / 25V - C3: 100nF - C4: 22µF / 25V - C5: 100 µF / 25V - C6: 220nF - C7: 2200µF / 35V IC / Dioda - IC1: TDA2030 or TDA2030a - D1/D2: IN4002

Simpleclock is an easy to assemble attractive 4-digit 7-segment LED display clock with temperature and alarm function. It is available in three display colors: Red, Blue and White. It comes as a kit of through-the-hole parts and can be soldered by any person with basic soldering experience. An attractive acrylic stand is included. [ ]

The flash module in this circuit comes from a  Fuji disposable camera. The author’s design  is based on various ideas on this subject that  can be found on the Web. The guide number  [1] of the flash is approximately 14 in the air  and close to 6 underwater. The flash intensity  is not adjustable. This flash unit is primarily intended to be used  for underwater photography, which is why  the author fitted it in a  case originally used for  a Nikon Coolpix 7900.  Of course, it can also  be used for dry-land  photography. The flash  module is powered by  a 1.5-V battery, which  must supply approximately 30 to 40 mA  to charge the capacitor. The control portion is built around a  PIC12F675, which is  powered by a 3-V button cell. Its current consumption is practically negligible  just a few  milli amperes while the flash is active and only  600 nA the rest of the time, when the micro-controller is in the standby state. For this rea-son, the unit does not have an on/off button. The flash from ...

Description Most mobile chargers do not have current/voltage reguLation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack . Most of the mobile phone battery packs have a rating of 3.6V, 650 mAh. For increasing the life of the battery, slow charging at low current is advisable. Six to ten hours of charging at 150-200mA current is a suitable option. This will prevent heating up of the battery and extend its life. The circuit described here provides around 180mA current at 5.6V and protects the mobile phone from unexpected voltage fluctuations that develop on the mains line. So the charger can be left ‘on’ over night to replenish the battery charge . The circuit protects the mobile phone as well as the charger by immediately disconnecting the output when it senses a voltage surge or a short circuit in the battery pack or connector. It can be called a ‘middle man’ between the existing charger and the mobile phone. It has features like vol...

Frequently, the sound yield from a laptop's fabricated-in speakers is flat. A capacity intensifier is needed to get an elevated volume. Here is an effortless circuit to intensify the laptop's sound yield.  The circuit is constructed around capacity enhancer IC LA 4440 (IC1) and a few alternate parts. LA4440 is a double channel sound capacity speaker. It has level twisting over a vast run of flat to towering frequencies with exceptional channel detachment. Inbuilt double channels prepare it for stereo and extension speaker provisions. image : http://circuitschematicelectronics.blogspot.com/2011/02/2-x-20-watt-car-amplifier.html In double mode LA4440 gives 6 watts for every divert and in scaffold mode 19-watt yield. It has swell denial of 46 dB. The sound impact might be grasped by utilizing several 6-watt speakers. Associate binds 2, 6 and ground of IC1 to the stereo jack which is to be utilized with the laptop. Collect the circuit on a customary-reason PCB and encase in a suit...

             Deaf and Dumb people communicate with each other  and others in many areas of everyday life. Often they need support to communicate effectively with each other. The project aims to develop a complete Portable Communication Aid for deaf and dumb. A flex sensor glove along with MEMS Accelerometer is used to convert the sign language to voice. The PDA with voice to text converter converts voice to text format.             The 3 axis Mems and Flex sensor glove is connected to the  ADC channels of the LPC 2138 Microcontroller. According to the digital output values from Mems and Flex sensor, The microcontroller recognize the corresponding letter and transmits to voice recorder IC through SPI module. The IC converts these to voice format.             The project also includes a PDA with voice to text converter which converts th...

This source uses LEDs and an astable oscillator to control the switch, duty-cycle, and effective IR illumination output.  Circuit Diagram