Did you resonate them? MUST be resonant if you care about range and efficiency Russell On 27 February 2012 12:38, IVP wrote: > http://www.youtube.com/watch?v=3D1V0yRJspOyA > > I've made one of these with two 20-turn air coils (0.63mm enamelled > wire), 15mm diameter, transmitter centre-tapped. Standing current is > 32mA @ 5V, rises as the receiver is loaded with white LEDs and a > PIC. Good place to start experimenting from > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .