Battery life extender circuit diagram,taking care of your iphone battery,battery cost graph online,sanyo eneloop rechargeable battery - Plans Download

05.01.2016
Conserves battery life by charging capacitor from 0 V at efficiencies over 80% and by allowing battery to be used to lower endpoint voltage, Will generate voltages above or below battery voltages.
The inspiration for this circuit came from the Auto Ammeter published in the June 2002 issue of SILICON CHIP. Hall Effect sensor whose output at pin 3 is nominally at +2.5V and is fed into opposite inputs of comparators IC1a and IC1b. The two LEDs will show which way current is flowing in a circuit which is particularly useful when testing wires (which do not have the correct wiring code) within a wiring harness. A simple current probe can be made using a 30A battery clip (DSE cat P-6420) and a small toroid (DSE cat R-5410).
This is really a project for winter when the colder temperatures reduce battery capacity and make engine starting harder. 2002 and Rick Matthews in the May 2002 issue of SILICON CHIP to make quite an improvement on the circuit originally published in the December 2000 issue. This circuit automatically turns a motor cycle's headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. In practice, this means that the headlight will be on most of the time while the motor is running and charging the battery.
The 100nF capacitor and 220kΩ pull-up resistor at the base of Q1 are there to prevent false switch-on at ignition turn-on and they reduce the sensitivity of the touch point. There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding.
220pF capacitors to raise the frequency or add capacitance in parallel to lower the frequency. Q1 is biased with a 1MΩ resistor to give a high input impedance and this allows the use of a crystal ear piece as a low cost microphone. With a fresh 6V battery, transistor Q1 is cut off and Q2 functions as a current source, feeding about 2mA to the green LED. While this circuit has been set for a 6V battery, the transitions can be changed to suit other voltages.


While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. This circuit allows typical smoke alarms to be powered from the 12V supply in a burglar alarm while still keeping the standard 9V batteries in place. In normal operation, the LM317 supplies 9.7V and this is fed via diode D2, resulting in just over 9V at the smoke alarm supply terminals.
Volt regulators such as the LM708, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle. The power transistor is used to boost the extra needed current above the maximum allowable current provided via the regulator. Current up to 1500mA(1.5amp) will flow through the regulator, anything above that makes the regulator conduct and adding the extra needed current to the output load. When used in capacitor-discharge ignition system, power conversion efficiency is so high that heatsink is unnecessary and only one power transistor is needed.
The other comparator inputs are connected to resistive voltage dividers and their thresholds set by trimpots VR1 & VR2.
This circuit is designed to shift the regulator's earth reference voltage up by about 0.6V to increase the maximum charging voltage. The coil is a toroid of 13mm diameter with approximately 70 turns of 0.5mm enamelled copper wire. R11 (10kΩ) was added in series with the current regulator as without it Q5 would stop the oscillator altogether instead of just altering the pulse width. The last stage uses the 22Ω resistor and ZD2 to turn on transistor Q2, which pulls the base of Q1 down, switching it hard on. Under the bonnet, it can be disguised as a horn relay, making it easy to hide as well as costing less than $20 to build. The tiny current which flows through your body turns on the Darlington-connected transistors Q1 & Q2 which activate relay RLY1. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536).


As the voltage from the battery drops, the bias on Q2 is reduced and so it is turned on less and Q1's emitter is no longer held below its base.
Added to that is the irritation of random beeps from the alarm as the battery reaches the end of its useful life.
It extends the 9V battery life to that of its "shelf life" as the battery is only required to drive the smoke alarm in the event the 12V supply is removed or shorted out.
The energy harvesting power supply, consisting of an integrated full-wave bridge rectifier and a high voltage buck converter, harvests energy from piezoelectric, solar, or magnetic sources.
Givesfull output voltage even when car battery voltage is less than half nominal value, as during cold starting. To do this, you score all round the surface of the toroid with a hacksaw and then carefully snap it in half. The extra voltage to the battery will do little harm given that it is less willing to accept a charge in cold weather and greater demands are made of it with more difficult starting, lights, wipers, etc.
In conjunction with the Vbe drop of Q2, ZD2 will turn off Q2 at a battery voltage of about 6.7V. Thus Q1 turns on gradually (as battery voltage falls) and so the red LED is progressively lit, producing a colour change from green to orange. The primary cell input powers a buck-boost converter capable of operation down to 1.8V at its input.
This setting is sensitive enough to detect the current drawn by a 5W globe in a 12V circuit.
The buck operates when harvested energy is available, reducing the quiescent current draw on the battery to essentially zero, thereby extending the life of the battery.



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