Rocky Posted February 8, 2004 Report Posted February 8, 2004 I would like to construct the Frost Alarm (#4 in Project section). Can you give me the pin connections for the UA741?ThanksRockyProject Link: http://www.electronics-lab.com/projects/sensors/004/index.html Quote
MP Posted February 8, 2004 Report Posted February 8, 2004 Rocky, here is the complete data sheet (attached)There is no difference in pin out for UA741 or LM741 in case you are wondering.MPLM741.pdf Quote
mixos Posted February 9, 2004 Report Posted February 9, 2004 For fast reference check the schematic I attach. The rest of the pins are not connected. Quote
yash_zombie Posted December 25, 2005 Report Posted December 25, 2005 Hi...im relatively new to electronics.are there any links which could explain me the frost alarm circuit with more details?..and is there a way to insert a button into the circuit to override the alarm and a rest button as well??..please help me out.thanks,yash Quote
MP Posted December 27, 2005 Report Posted December 27, 2005 The thermistor is a device which changes resistance with varying temperature. Thus, the thermistor and 100K pot provide a voltage divider to the comparator circuit, which triggers at the voltage level adjusted with the pot.If you want to disable the alarm, a switch which allows for a fixed resistance instead of the variable resistance of the thermistor would do the trick.MP Quote
soldering rod Posted May 2, 2007 Report Posted May 2, 2007 HaiI ll be happy :) if you explain in more detail how the circuit works ??? and the role of op-amp in that circuit. Soldering Rod Quote
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