Make: Radio

42 Make: Radio

You may want to mount the ferrite rod, the

tuning capacitor, and the breadboard on a piece

of plastic or plywood to anchor them securely.

Otherwise, if the rod and the capacitor slide

around, they are likely to pull wires out of the

breadboard. In Figure

2-12

, an additional block

consisting of four pairs of terminals has been

added at lower left to deal with the power supply

and the output to the earphone.

TESTING AMR2

Don’t expect to power AMR2 from an everyday

AC adapter. If you try, you’ll most likely hear

a shrieking sound, as adapters tend to have a

noisy output that will be picked up by the ferrite-

rod antenna and amplified ...