DIY Auto turn-OFF featured cheap Digital Multimeter
Youritronics member Florin brings you a wonderful design that enables you to add an Auto-OFF feature for 15 mins in your old and cheap digital multimeter(DMM). With this you can save your battery consumption even if you forgot to turn-OFF your DMM. To add the Turn-OFF feature, you will be requiring a very few components like – microcontroller (tiny25 in the present case), a voltage regulator, a npn transistor and the associated capacitors