@@PCBANDSSCELECTRONICS sir please ik request hai aapne jo 500 watt wala class d board dikhya hai jo hath ke size ka tha jisme aapne bola tha ke inductor coil lgana mushkil ho jata hai jisme bias voltage ki 2 wire lagi hui hai please uski bias voltage ke connection bta denge ..mujhe ik board mila hai same vaisa hi maine wo chla kr dekhna hai ..ager aap please uski bias voltage ke connection bta de ke 12volt me 12 volt kider dena hai aur 0 kis side dena hai