Simple Rain Alarm Circuit Diagram

How Does Simple Rain Alarm Circuit Diagram Work? This circuit with sound an alarm when the sensor is exposed to water. The sensor used is an aluminium foil attached to the plywood as a base. The flowing water to the sensor circuit will make the current in X-axis flows...

Simple Daily Alarm Circuit Diagram

How Does Simple Daily Alarm Circuit Diagram Work? This alarm will wake you up in the morning. LDR is used as a sensor. When there is no light, the basis of the transistor value is 1 (high) and the emitor is 0 (low). This will reset the IC timer. The value will be...

Simple Burglar Alarm Circuit Diagram

How Does Simple Burglar Alarm Circuit Diagram Work? IC timer 555/556 serves as alarm to prevent house burglary. The alarm will sound when the thin cable connecting R1 and pin 4 IC 555 disconnected. The thin cable used is a fiber. The thinner the cable, the more...

Simple Beep Alarm Circuit Diagram

How Does Simple Beep Alarm Circuit Diagram Work? This circuit will sound a beep. This circuit utilizes IC timer NE555 as a repeating ON/OFF. The first timer circuit will result the oscillating frequency of 1kHz, whilst the second time in ON or OFF state based on the...

High-Fidelity Siren Circuit Diagram

How Does Simple Hifi Siren Circuit Diagram Work? Hifi siren is similar to police siren. In the beginning the sound is weak and than goes stronger and than goes weaker again. If the start switch S1 is pushed, flip-flop around N3 and N4 slowly down. This will cause the...