his 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:
No comments:
Post a Comment