What happens when only a few pins of 555 is used? Still we can make circuits. Here ,is a simple Fire alarm based on IC555. The trigger pin2 is used to achieve the result in addition the VCC and Ground pins. In this design, the IC555 act like a switch to give high output. When the temperature in the Room or a device exceeds the set limit, alarm sounds.
Here is a 3 component Heat sensor. You can attach it with the heat generating devices like CD player, Inverter etc. When the heat inside the cabinet of the device increases above the set limit, buzzer beeps.
Electronics is a Fun and Hobby and you can try a circuit if you have some basic knowledge in electronics. Circuit making is an interesting hobby and it will improve your memory; sharpness and more over you will utilize the spare time to learn more. The Articles posted here in series will help you to understand the working of electronic components. Component identification tips, Pin assignment of components etc will also be included. Start electronics and enjoy its beauty.
Excess heat in electronic devices can damage the delicate CMOS components and it is necessary to monitor the temperature in these devices. With this Five component circuit, you can monitor the temperature in the heat generating devices like CPU, Inverter, CD player, Amplifier etc. It gives a warning alarm, when the temperature inside the cabinet of the device exceeds the normal level. It uses an NTC Thermister as heat sensor. The circuit is too small enough to enclose inside the gadget.
This simple circuit acts as a warning device whenever the temperature exceeds the preset level in its vicinity. It is an ideal circuit to monitor the heat generating devices like PC, Inverter etc.
This simple circuit can monitor the heat generating devices like Amplifier, CD player, Inverter etc. The LED in the circuit blinks when the heat inside the device increases above the preset value. To give more visual attraction, a seven segment display is also included which shows a digital display as the temperature increases.