Component which bleeds excess voltage to ground?

[Plasmateur]

Hello,

I'm trying to build a circuit with an opamp which needs protection from a voltage (27.12MHz) getting too high.

Can I just use a transistor tying both the line in to both the Vcc and Vin, and in the event the Vin threshold is met, the signal will simply go to ground and protect my op amp? Or is there a more elegant solution or component I can use? 

[BrianHG]

Use a zener diode.  Remember to choose the right wattage depending on how much excess current you expect when you exceede the maximum voltage.

[Plasmateur]

Thank you for your response.

The signal I am attempt to capture is also RF. Is there a Zenor diode configuration which will allow both positive and negative voltages to pass, while clipping a set amplitude positive or negative?

EDIT:

I think I found what I'm looking for here: http://www.electronics-tutorials.ws/diode/diode-clipping-circuits.html

Thank you so much again!