Don't you need flashing with the 555 timer technique. Do you only need to light up 50 LEDs directly from 230 ?But i try to use Rksk 1st circut diagrame (hand written one) + above circut final diagrame(ledstr.png). Will I have to do any modification using this cc't with 50nos white led with using 230v and without transformes?
If you need to flash them with a 555 timer as on above circuit, you will need to step down 230 VAC to 12 VDC to use the same circuit (You can also step down to say 24 VDC but you will have to change the 555 timer circuit since the 555 IC mostly support input voltages from 4.5V to 15V).
To connect 48 LEDs, you can connect another line (6 LEDs per line) as same as the circuit uses 3 lines at the moment. You will have to change the 5.6 Ohm (5R6) resistor to 10 Ohm to control current.
Anyway if you need to bypass the 555 timer circuit and directly power the LEDs through 230VAC, you can work our Rksk's suggestions to make a transformer less circuit. Consider getting the required current from the circuit. Typically 5mm LEDs are having forward voltage: 2V and forward current (mA): 20mA. If you connect 50 LEDs, you will need 1A. So the design concern should be to build the power supply to provide 1A.
