leonheard Posted April 26, 2013 Report Share Posted April 26, 2013 hello!!!i made a alarm circuit with a fototransistor and ir led , when the door opens it turns ON and a siren HIGH sound activates and the only way to turn it off is manually…. anyway it works great!but when the power supply ( a 3.5 v battery ) is On for about 7 hours, it automatically turns the alarm ON! and that’s bad.my theory is that when time goes it spends current, so the 3.5 v battery doesn’t have the same amount ofcurrent like 7 h before, so the “sensor” is like more or less sensitive and triggers the alarm….how can I solve that problem? do I have to use some sort of HIGH PASS filter?please help. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 26, 2013 Report Share Posted April 26, 2013 Please post a schematic. Quote Link to comment Share on other sites More sharing options...
Guest remonx6 Posted August 3, 2013 Report Share Posted August 3, 2013 yes Thanks Author I attach a Door alarm circuit diagram thanks Quote Link to comment Share on other sites More sharing options...
Guest Jibby Posted October 3, 2013 Report Share Posted October 3, 2013 Only way to redesign for driving the circuit to sleep mode while no signal is received to save battery power Quote Link to comment Share on other sites More sharing options...
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