This moisture detecting circuit may catch out a fibber by sensing sweaty palms, but its great also as a house plant water tester, conductivity tester or even a cake moisture meter! Find your own experiments with this versatile kit. DIY requires soldering iron, solder, wire cutters, battery, safety goggles and adult supervision (a solder-sucker is handy too).

Play eight glorious notes on this music making monstrosity, which shows principles of a real keyboard. Great for musicians and electronic freaks. DIY requires soldering iron, solder, wire cutters, battery, safety goggles and adult supervision (a solder-sucker is handy too).

A miniature microphone on a long piece of wire attached to a high-power amplifier creates this slick bugging device. Hide the microphone in everyday objects, then eavesdrop away. CSIRO does not endorse this product for unethical or insensitive purposes its about having fun. DIY requires soldering iron, solder, wire cutters, battery, safety goggles and adult supervision (a solder-sucker is handy too).

This robust snap-together electronics kit has 118 circuits to build from sound effects, motors and lights through to way-out projects like a baby urine alarm! These tough kits were road-tested in CSIRO Science Education Centres and use press studs to join integrated circuits, switches, motors, LEDs, speakers and more. AA batteries required. Simple construction, clear diagrams and hours of electro-fun. Tops for teachers!

Build your own alarm using a simple circuit and buzzer to detect an opened door. You'll learn the basics of electronic circuits with this kits simple solderless, snap-together construction. Requires 9V battery.

Discover the inner workings of a radio with this great value, easy top build, solderless kit, including earpiece. Receives 88-108Mhz, so you can tune into all your favourite FM stations. Requires 9V battery.