Audio - Alarm

That circuit uses the MSM6322GSK which is only available in small 24 pin plastic SOP style package. A speech pitch converter IC that operates in real time and requires very few external components. It has a microphone preamplifier and line level input and the output requires only a single transistor to directly drive a loudspeaker. [...]

This is lamp flasher circuit. It is use transistor 2 pcs. For the system shows matters for objection which rub encourage give work by the alarm. An officer will take the alarm by pressure the Secretariat of the switch Sa. Which will change a light bulb from the winking to sticking bright is [...]

This circuit is based on a preprogrammed multi-instrument melody generator IC, containing a 512-note memory capable of generating 16 tunes. The comprehensive control facilities enable playing - all tunes repeatedly or stopping at the end, - or one tune repeatedly or stopping at the end. Tunes are preprogrammed with one of three instruments, sounds: the [...]