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Green USB switch Circuit Diagram. According to the Energy Saving  Trust, if you add up all the current drawn in standby mode by items such as stereos, TVs, VCRs and DVDs over a year in the UK alone, it amounts to 3.1 million tonnes of CO2 released into the atmosphere.This is without factoring in the current drawn by all the PCs,laptops and their associated peripherals left in standby mode.  Green USB switch Circuit Diagram Green USB switch Circuit Diagram It  is  not  necessary  to  spend  a  great deal of money or time to  make a difference on a personal  level. The circuit described here  is designed for use by laptop or  notebook computers. It will automatically switch off all mains  powered peripheral equipment  including monitor, printer, scanner, TV tuner and USB hub etc  when it detects that the notebook  is switched off. The circuit is quite  straightforward; in addition to an  opto...

Here is a simple, electronics street light switch using LDR and NE555. The working of this circuit is truly based on light sensing, i.e. automatic turn it on in night (no sunlight available) and turn It off at sunshine (sunlight available). An electronics street light switch is a switching circuit so, for more detail we can divide this circuit into two section i.e. power supply and switching circuit. In this power supply section the work of step-down transformer is done by register R1 and further rectification to change into 9.1V dc is by diode D1 and zener diode ZD1. The output voltage across zener diode is further filtered by capacitor C1 and C2. The another section of street light is switching section built around light-dependent resister LDR1 with the help of transistor T1 through T3 and timer IC NE555 (IC1), where LDR1 is used as sensor of this switching circuit.As in day time the resistance of LDR1 remain low but it is reverse in night time i.e. high resistance is offered by ...