Attached picture is an article someone discovered recently cut-out from what apparently was a children's section in the (now defunct) Sunday Tribune
from sometime in the 1980s!
How to build a 'crystal' radio - requires no power at all - this could pickup strong MW stations
with a good enough wire aerial with earth and drive a high-impedance type earpiece.
With the Medium Wave radio band since gone into disuse in this country you would be hard-pressed to hear anything if you built this nowadays!
Mention is made of 'Peats' electronics of Parnell street in Dublin as an Irish supplier of components required
which sadly went into liquidation yesterday (2 April 2012) - which had been trading since 1934.