English to Romanian Tech/Engineering Telecom(munications) G6ALU 20W FET PA – Cons

Field effect transistors have been used for the power stages, these are low cost and have so far proven to be very robust. One failure mode that must be looked out for is excessive device dissipation; ensure that the gate is not left “floating”. If for any reason there isn’t a DC connection the gate may rise in voltage and turn the device on drawing excessive current leading to device failure. The devices used here are in a TO220 package which differ from switching devices in that the tab is connected to the source electrode, so in this
design are grounded by the PCB and heat sink. No insulating washers are used when bolting the devices down to the heat sink and PCB.

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