They aren't needed because half the LEDs limit the reverse voltage for the other half of the LEDs in this AC circuit.fever said:thanks for the circuit diagram.
but the 4148 and 4007 diodes are missing.
Calculate how low is the LED current. The peak current is only 7mA and 8mA. The average current is less than 3mA. LEDs are rated for continuous operation at 20mA and their max allowed continuous current is 30mA.20 LED circuit will draw pretty amount of current.so is this circuit suitable for 10-12Hrs operation?