This AM receiver consists of a TDA7000 single-chip FM receiver (U1) as the main radio component,  and an LM386  chip for low-voltage audio-power amplifier (U2) circuit. The receiving coils are  hand-wound coils (L1 and L2), and a few additional components.  This coils, together with the variable capacitor, is chosen to match the AM frequency. To wind your won coil, L1 and L2 are 100 turns of #28 wire on toroidal cores (about 240 μH each).  At 30 turns, L1 is tapped . Here is the schematic diagram of the circuit:

TWO CHIP AM RECEIVER2 circuit schematic

[Circuit’s schematic diagram source:]