MK 484 Radio - Tuning Capacitor Value?

The component values depend on what frequency band you wish to tune.

Here's a link that may help you.

Note that the MK484 IC is rated only to 3 MHz.

I want to tune the AM band 530 kHz too at least 1500 kHz. There's not too many AM stations in the high end of the band, (highest one is at

1431 kHz, the one I usually listen to) so I'm not worried about the radio tuning any higher than 1500 kHz

Pinch the tuning cap and ferrite rod out of an old transistor radio.

You could use the ferrite coil from a junk AM radio, or wind the one shown in the link. The author of the publication used a 120pF cap, but your 365pF cap will do fine; the lowest frequency will be achieved with the plates about 1/2 meshed unless you use fewer turns. If you wind the coil on a ferrite rod, I suggest you tap it every 10 turns and experiment.

Don

I've got an old AM/FM radio I don't use any more, I might pinch the tuning cap and ferrite coil from that, and save the 365 pF cap for a tube regen I'm planning. I forgot to post the link where I found the schematic,