Showing posts with label tips. Show all posts
Showing posts with label tips. Show all posts

TRANSFORMERLESS POWER SUPPLY 12V 100MA

     

    This is a transformerless power supply for low current applications. C1 is the X rated AC capacitor that reduces high volt AC. D1-D4 rectifies AC to DC and C2 removes ripples. R1 is the bleeder to remove stored current in AC when power is off. R2 limits inrush current. A Zener can be used in the output to get regulated DC.


How to Make Your Cell / Mobile Number Unreachable?


   
   We sometimes don’t want to receive calls at a particular 
time. But the caller understands that we are not receiving 
call. So make yourphone unreachable & the caller will 
thought that its a network problem. No need of removing sim 
card! Lets start.
   Go to Menu> Settings> Phone> Operator 
selection> Manual.Now your phone will search for 
available operators.
   Select any other network except your own network (i.e. If 
your r using Airtel, select vodafone in). You’ll get an error 
message ‘No network access’.
   Now look at the signal bar. It is empty! But don’t press 
back. If you press back, the phone will capture signal again. 
If any caller call you then, he will hear that your phone is out 
of network range!
   This trick works on almost every nokia s40 handset, hope 
will work on others phones.