I've been looking at some diy radio tutorials, and I'm

Small inductors will give you large ripple voltages, which will affect the signal.

Large inductors are expensive.

>>7962178
What causes the ripple?

>>7962265
The small induction.

>>7962265
muh dick

>>7962161
Shouldn't there be some kind of detector in OP's image, like a diode at least? That thing looks like it'd put out garbled modulated signal.

>>7962276

Diodes are for queers.

>>7962265
Has nothing to do with ripple (not a low pass filter), it's about loss of energy in the coil. Larger coils have a higher Q (quality) factor. Do you still have AM stations and the necessary space for a long wire antenna? There are many tutorials on the net, look for crystal radio.

Well, in the pic, your inductor has a sliding tap, it might be cheaper to make your own sliding tap inductor than to buy one.