usually such sensors works at | Electronics › Electronics › TSOP › usually such sensors works at February 12, 2014 at 9:10 am #11011 Ashutosh BhattParticipant usually such sensors works at frequencies 34KHz to 40 KHz you can get idea from the number also like in your case it will be 38 KHz. you can not use this sensor without IC555. if you want be it simpler use IR LED and photo diode pair
