Update 'README.md'

README.md

@@ -46,6 +46,7 @@ OR: RPI 3b v2 has composite out trough the minijack trrs connector. NOTE: the gr
 
 ### Winding coils and soldering
 Use a 5mm drill bit to wind your coil around. (coil = 7 tight turns of 0.7mm (measured 0.6mm) around a 5mm drill bit, after winding TIGHT, spread the coil out to be around  7mm/7.5mm in lenght, coild-end to coil end...).
+
 ### Parts
 * Transitor - Kogawas japanese transitors are from the 1970's and unobtainable, but you can use practically any general purpose NPN transistor: BC547b, BC548b, 2N3904 just take notice of the pins and orientation.
 link: https://octopart.com/bc547b-on+semiconductor-354110?r=sp
@@ -62,6 +63,7 @@ link: https://octopart.com/pt6kh102a2020-piher-13709261?r=sp
 * DIY: 1x Coil: 7 turns, 0.7mm magnet wire/transformer wire (width 6.8mm)
 * 9 Volt Battery
 * 9 Volt Battery Clip: https://octopart.com/233-keystone-20415?r=sp
+* 60x40mm copper clad fr4: http://www.fortex.co.uk/product/fr4-uncoated-single-sided-copper-clad-pcb-laminate/
 
 Complete Bill of Material:
 https://octopart.com/bom-tool/QOJ00mDh