Triode Control Board

The picture shows the triode board. A series transistor is being used for tx/rx switching. The grid voltage is regulated with a TL431 with a series transistor as well. The circuit was copied from other control boards. Ia and Ig metering and Ia and Ig trip function is included, using parallel resistors to improve reliability. In addition a control board using a PIC microcontroller is under development. The function of this board is to monitor and control the triode board signals, as well as inrush 
current of the HV transformer,  min/max Anodevoltage, min/max filement voltage and the blower and VSWR. Amp status information is displayed through 2 x 20 LCD on amp. Alarm status is displayed on 4 LED's.