This antenna preamplifier can work with signals from about 20 MHz to 100 MHz, depending only on the L1 and L2 coils. For the VHF L2 range, you can have 4 to 10 turns of wire 28 in a ferrite rod and L2 of 2 to 4 turns on L1. The circuit has low consumption and equivalent FETs can be used.
| Clique na imagem para ampliar |
