What is the current account switch service and how can you use it to earn money?
Customers and businesses who change from one bank to another by using the service are fully protected against any monetary ...
Hackaday4y
Simple AC Current Detector Built On A 9 Volt
and when held close enough to a conductor carrying AC power, a current is induced in the spring which is sufficient to turn the transistor on. The transistor then switches on a second BC547 ...