feedthrough capacitor

The +8V power connections were brought out individually through feedthrough capacitors mounted in one of the sides of the box, and commoned outside.

Finally, two feedthrough capacitors are also installed in the 0.5mm thick brass walls of the box housing the VCO.

A "feedthrough capacitor" has a guaranteed minimum value of shunt capacitance built in it and is used for bypass purposes in ultra-high-frequency applications.

To retain the shielding efficiency of the single modules, all of the supply and low-frequency interconnects go through 220pF feedthrough capacitors soldered in the narrow sides of the brass frames.

A common and effective method of doing so for wires carrying DC supplies, 50/60 Hz AC connections, audio and control signals is to use a feedthrough capacitor, whose job is to short circuit any RF on the wire to ground.