The temperature of some electronic components used in a device may rise unexpectedly and these might get damaged. This multichannel visual thermometer can indicate...
While repairing or installing electrical machines in a building, the AC mains power supply is switched off from the mains electrical switchboard installed outside...
You can make an ultra-simple desktop emergency light using ‘discharged’ batteries. You know that battery cells still have considerable energy left in them even...
Small cooling fans are used in some equipment for cooling semiconductor devices. The circuit given here is of a simple automatic speed controller for...
This handy remote control tester responds to the signal received from any infrared hand-piece (IR remote control).
Circuit and working
Fig. 1 shows the circuit diagram...