50 Watt HF Amplifier Build By OE1CGS

http://www.oe1cgs.at/50w-hf-verstaerker/

Based on a low-cost kit, the documentation leads step by step over suitable low-pass filters and a custom-made, 3D printable housing to a practical finished device. Overall, with component costs of just under € 50, you can make it and can finish the device in about 6 to 8 working hours, provided that you have a kit, a PCB for low-pass filters, other components and a printed housing.

The main performance data at a glance:

Supply 12 - 14 V DC (max 8 A)
Optimal input power 2 to 2.5 W
Output power 30 to 50 W
Optimized for operation from 40 m to 20 m
Manual band switching
Sufficient suppression of harmonics
Efficiency ≈ 45%
Passive cooling, prepared for fan