Mutchus

Description You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current of 300-350 mA. Using it you can charge three types of batteries: lead acid, Ni-Cd and Li-ion. The lead-acid batteries are commonly used in emergency lamps and UPS. The working of the circuit is simple. The output of the solar panel is fed via diode 1N5402 (D1), which acts as a polarity guard and protects the solar panel. An ammeter is connected in series between diode D1 and fuse to measure the current flowing during charging of the batteries. As shown in Fig. 1, we have used an analogue multimeter in 500mA range. Diode D2 is used for protection against reverse polarity in case of wrong connection of the lead-acid battery. Charger circuit diagram: When you connect wrong polarity, the fuse will blow up. For charging a l...

Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see the simple charger page. Since wall chargers provide about 55mA, you should not use this dual circuit to charge batteries at rates greater than 27mA (for a total of 54mA).

Small projects of digital electronics are an affordable option for students, teachers and parents as they do not require expensive laboratory and fully stocked. Many young people want to learn about digital electronics and build their own devices as well as work with the parts of a computer and analyze how the circuits of the digital world work, but can not do in their classrooms or at home because it is too expensive. There are several small projects that enable young people to practice the skills necessary to enter college skills, although they are more easily and used parts are readily available. Small projects of digital electronics provide affordable education for children. Jupiterimages / Photos.com / Getty Images Cell Phone Detector A mobile phone detector is a project that draws attention to the generation of the digital world. Most students now have mobile phones, thus making this type of project will be exciting for them. Once the project is completed, you can do a treasure h...

Small, portable, anti-bag-snatching unit. Also suitable for doors and windows control This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched abruptly, the magnet looses its contact with the reed switch, SW1 opens, the circuit starts oscillating and the loudspeaker emits a loud alarm sound. The device can be reverse connected, i.e. the box can be placed in a pocket and the cord connected to the bag. This device can be very useful in signalling the opening of a door or window: place the box on the frame and the magnet on the movable part in a way that magnet and reed switch are very close when the door or window is closed. Personal Alarm Circuit Diagram : Personal Alarm Circuit Diagram Circuit operation: A complementary transistor-pair is wired as a high efficiency oscillator, directly drivi...