Vermes
Advanced Member level 4
The system consists of velleman K2655 kit, audio amplifier on TDA2003 bridge and motion sensor with a relay that activates the system. The whole is powered by an old transformer TS40. 12V voltage after rectifying gives 17V, what is perfect for the power supply. A switch that changes the voices of dogs was used instead of the jumper. Also microphone was soldered. LM7809 was added in place of the battery supply 9V to power everything by one transformer. Applied simple motion sensor controls the relay that activates the system through TRIG option.
The system can be placed in a plaster dog figurine, so remember that the whole device should be the smallest possible, compact and stable. There are two different dog voices in the system to select.
Video - test:
Link to original thread (useful attachment) – Elektroniczny pies obronny