Smoke Extractor Circuit Diagram
Here is a low-cost circuit that automatically extracts solder fumes while you assemble a circuit, thereby saving you from inhaling the same. The solder paste gives off toxic fumes, which could pose a potential health hazard if not controlled. Those working closely with electronic components are at a higher risk of fumes being inhaled. Place this compact unit close to the circuit board and it will extract all the fumes from the immediate working area, leaving smoke-free surroundings. It is fully automatic and turns on a fan when the soldering iron is kept in the holder unit after making a solder joint. The fan automatically turns off after a few seconds. The automatic working of the unit is convenient as the soldering work is intermittent. Fig. 1: Circuit of smoke extractor The circuit (Fig. 1) is designed around popular op-amp µA741 (IC1), which is configured as a comparator. Its non-inverting input (pin 3) is held high by a potential divider comprising resistor R1 and an NTC thermisto...