Simplest multivibrator,mains operated

            Simplest multivibrator,mains operated(tested OK)

             I have been  thinking of a simplest alternate led flasher with main supply 230V ,without any transistor since last few months.After many  days  of trial and error,at last i have succeeded in that task. This is a simplest mains operated  multivibrator  without any transistor. ckt working well  fine for last few  months continuously.Cost of this  comes  around 6 to 7 Rs  or less only.

When apply 230V,Cap c1 starts charging.

while cap charging,led2, (series with cap) lights. DB3  get less than 30V while cap charging and does not conduct. After full charge of cap, diac conducts and  led1( series to diac) lights,n cap discharge thru 1N 4007 ,that time LED2  light get dim ,which gives alternate blinking effect.

1.8K Resistor series to led1 is more than the requirement ,but given for matching the light intensity with LED2. 

                                                         
                                                                            circuit  (click)

             R1-47K,R2-1.8K,D1,D2-1N4007,D3- DIAC DB3,C1-47uF/63V,

                        Thanks& regards

                        Vineesh kodambattil