12v 2a Transformerless Power Supply Circuit Diagram. It is basic of unregulated supply circuit 12v 0 2a. The above diagram represents the transformerless power supply 12v.
They use the transformerless power supply circuit. During one half wave the current flows via d1 through the load and back via d4 while during the other half wave it flows via d3 and d2. It is nothing but converting 220v main ac voltage to 12v dc voltage with the use of the capacitor resistor bridge rectifier and zener diode.
9v regulated power supply circuit diagram.
1 5v 3v 4 5v 6v 9v at 1 5a selector voltage regulator. From the above figure c1 is used as an x rated capacitor to drop the high ac voltage. The idea seems to have solved the problem of deriving high current from capacitive power supplies which earlier seemed a difficult proposition. Thus power supplies are smaller and lighter.
