Big Daddy 2803/ULN2803/ULN2803A Tester di matrice di transistor
Location U20 on MPU boards, U19 on WPC 89 driver boards and U3 & U11 on WPC 95 driver boards. Quality kept in mind. Assembled in the USA by Big Daddy. Pressing S1 checks for any shorts, if an LED is lit, chip is bad.