This circuit allows you to transform a mains adapter in to a charger for NiCd – NiMH batteries. With selectable charge current (50mA-400mA), the charger can be used to charge cellular phone, toys, portables gadget, video batteries, MP3 players etc. Supply voltage input starting from 6.5VDC to 21VDC (depending on used battery). The circuit features […]
This VHF TV TRANSMITTER can be used to transmit movies from your PC to your living room, run a college TV station, hotel cable system info pages, re-transmit the TV program you’ve never been able to receive in your valley, cover rural areas of Africa with TV signal from satellite stations and other system that […]
This project can transmits phone conversation up to 30 metres (100 feet) to an ordinary FM receiver. You can experiment to get greater transmission range away from the phone line by adding an aerial (about 150 cm of 26 gauge wire) to the collector of T2 (see circuit below). To use phone transmitter, you need […]
The projects shows you how to build simple low cost Inductance Meter based on popular IC 555. The 555 works in its most simple rectangle oscillation configuration. In this mode, the duty-cycle should be around 50%, but this depends on the load on pin 3. Over the amplifying transistor Q1 the AC is given on […]
This guide helps you to learn and understanding everything you need to know about the Raspberry Pi computer, its background, purpose, system specs, the software it runs and the amazing things it is capable of. FREE DOWNLOAD Unofficial Raspberry Pi Manual (limited)
EDN magazine provides how-to solutions for design engineers in the electronics industry. Engineers turn to EDN because they know they will always find valuable design techniques that they can use to do their jobs faster. Subscribe EDN Magazine for free
