# Pre Amplifier
The Pre Amplifier is used to amplify the TX signal before it is sent to the RFPA. Always cool the Pre Amplifier, because it will burn out otherwise.

| <img src="../../_static/tutorials/Figures/2_preamp_pic.jpg" width=60%> |
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| Figure: Picture of the Pre Amplifier and the cooling fan. Both need 12V. The input and output side are marked on the backside.|

The Pre Amplifier needs a 12V power supply.