This is yet another project based on LM358.  The LM158 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.

Application areas include transducer amplifiers, dc gain blocks and all the conventional op-amp circuits which now can be more easily implemented in single power supply systems. For example, the LM158 series can be directly operated off of the standard 3.3-V power supply voltage which is used in digital systems and will easily provide the required interface electronics without requiring the additional ±15V power supplies.

About the kit: This is a simple LM358 based heat and light sensor. The kit is designed by Sagar Sapkota, the owner and operator of buildcircuit.com. The kit has two functions, it senses heat and light. When light falling on the LDR is blocked, the LED on one side turns on and whenever the NTC thermistor senses heat, the other LED turns on. You can adjust the sensitivity of the sensors using the potentiometers.

Check out the images below to get ideas for assembling the kit. You can see the images on Flickr also.

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