Thursday, November 29, 2007

SB-200 Power Supply Board

No DX on the band, so spent sometime to upgrade some of the ham equipment. The SB-200 HV have a certain drop when load. So I decided to upgrade the board:
1) replace all capacitors to 270 uF 450V 105 degree c
2) replace all rectifier diodes to IN5408
3) all bleeding resistors from 30K to 100K ohms

It was completed and the high voltage much more stable now.