Author Archives: circuit diagram


 

Low Cost Mosquito Repellent

Here is the simple and low cost mosquito repellent circuit design. The circuit serves to keep the mosquitoes out of the room or the location where the device is installed. According to certain publications, the frequency emitted by the male mosquitoes is said to be around 20—25 kHz, and so within the realm of ultrasound.… Read More »

Smart Vibration Sensor Alarm

Here the circuit design of vibration sensor alarm. Initially, when power switch S1 is flipped to “on” position, power indicator LED1 lights up immediately. IC LM555 (IC1), wired as a simple latch circuit with control input, is powered and R-C components R4 and C5 connected at its reset pin 4 force the latch to standby… Read More »

Glow Plug Control Module

This is the glow plug control module unit to raise the air temperature inside the engine cylinder for quick and reliable starting, to extend the battery life and reduce the diesel consumption. In diesel engines, the air in the cylinders is not hot enough to ignite the fuel under cold conditions. Therefore every cylinder of… Read More »

Simple and Low Cost Dew Sensor

This is a simple and low cost dew sensor circuit that can be used to switch off any gadget automatically in case of excessive humidity. Dew (condensed moisture) adversely affects the normal performance of sensitive electronic devices. The main part of this circuit is a low cost dew sensor element (resistor type). Although dew sensor… Read More »

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