This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system. parts : R1—————————1K 1/4 W R2—————————680 Ohm [...]
Operate with 5 to 12 volt, this circuit can be useful to mainly monitor the capacity of the batteries, portable and easy to operate. LED D1 flashes to attire the user’s attention, signaling that the circuit are running. The circuit generate about two LED flashes per second with current consumption about 200uA. The sequence of [...]
This is a free simple wireless car alarm circuit diagram to monitoring your car when parked near at your home or parked area. its using FM transmitter with range area not more than 20 meters. there are two devices, one you put in your car as a sensor, and the other one connected to the [...]
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