The original smoke alarm circuit electroschematics.com/smart-smoke-sensor-alarm/ has some problems and has left some hobbyists and students disappointed. Rather than ...
This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3.6 V battery or 3 x 1.2 volts rechargeable batteries. The well-known UM66 is used as the sound generator and will ...
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