You might have come across may great siren circuits from this website, however this siren circuit has its own advantages such as a high gain and high power output along […]
Bicycle Light and Alarm Circuit
The post illustrates a simple bicycle light circuit which can be used as a normal front/back indicator lights, and also as an emergency alarm signal such as an SOS signal. […]
Simple Burglar Deterrent Circuit
The basic principle applied to create burglar deterrent circuits the world over is to detect an unwarranted presence and ring an alarm or effect some kind of activity to alert […]
High Voltage Alarm Circuit
This circuit will raise an audible alarm as soon as the battery voltage goes above a predetermined over voltage limit. The astable section of a high voltage alarm is similar […]
Low Voltage Alarm Circuit
An alarm that gives indication of a low battery voltage, discharged at around 10.5 Volts in vehicles such as Boats and Cars can be made using a simple circuit. It […]
Vibration Activated Alarm Circuit
The noise or vibration activated alarm circuit displayed in this article makes use of its pre-installed loudspeaker like a microphone while it is within the sland- by-state. How the […]