Meco DIY Magnetic Control Flash Alarm Kit Electronic Practice Teaching

Description: ICs (K9561 or CL9561) made of microelectronic technology store four sounds: fire truck, police car, machine gun and ambulance, by changing the high and low levels of the two control terminals to obtain different sound. The circuit consists of two parts: multivibrator and four sound alarm. VT1, VT2 constitute the main multivibrator, VD1, VD2 alternate flash after power. Four alarm after power, the output of the alarm signal amplified by VT3, to promote the speaker BL work, resulting in a loud alarm sound. When the permanent magnet close to the "reed switch" the alarm does not sound and flash, and once the permanent magnet away from the alarm, it alarms with sound and flash, which can constitute a flash with anti-theft alarm. Power supply: 2 x AA battery Note: AA battery is not included. Package included: 1 x Magnetic Control Flash Alarm Kit