Hi,
It's a bit intriguing to find more circuits around the few components we have in this kit. So I came up with more circuits for you to experiment with :
1. An electrical field detector : Find electrical wires in the walls with this sensitive circuit. Use the Variable Capacitor to adjust sensitivity.
2. An adjustable audio generator, Use the Variable Capacitor to tune.
3. A Marconi experiment : See how it all started to transmit wireless comunication