Circuit Lake

This LED candle is built to mimic the look of a traditional candle without the dangers associated with an open flame. It uses high brightness LED and is controlled by ATtiny85. It could be useful as movie props where you cannot afford to have a candle go out during a take or in your home [...]

This project shows you how to build a robot voice generator with IC HT8950, a powerful voice modulating IC. The circuit has Robot function, Vibrato function and 7-step level shifting pitch. The construction is extremely simple and the unit is very small.

This smart cat door/flap helps you prevent unwanted cat to enter your house. It can only be opened by the cat/animal that wears the appropriate RFID tag. Main component of project including Arduino for main processor, Hall-effect sensor, Sharp GP2D12 infrared proximity sensor, 5V RF reader module, and RF tag. The project has custom made [...]

If you want to build simple function generator then this circuit is for you. This function generator is built based on IC XR-2206. It can be used to generate Square, TTL, Sine and Triangle waveforms. The frequency range is from 1Hz to 1Mhz and adjustable via VR3. User can change output voltage using VR2.