We found this circuit in a small espionage manual from 1993. The components are current, and the coils are easy to roll. L1 consists of 4 turns of wire 26 or 28 in the form of 1 cm without core and L2 plus 3 turns on L1. Tuning can be done by moving the core or by tightening and stretching the coil turns.
| Clique na imagem para ampliar |
