Competition (#3) entry: canaria furioso (canary simulator) 2010-08-05

The circuit has been designed to simulate a canary “Harzer Roller”. It consists of six timer ICs NE555.

Schematic

Please see attached files.

Theory of Operation

When powering up the circuit IC4 (a nonretriggerable monostable oscillator) is triggered by the low output of IC1, thus activating IC5, which – together with IC6 generates a winding up frequency (similar to a siren). P1 controls frequency of IC5 (approx. 20Hz) and P2...

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