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RuaRi said:Hey all, I'm trying to build a circuit that when a laser beam focused on a photodiode is broken it sets off a timer to activate a relay for a few minutes, This is the design I'm working on but I 'm having problems, so does anyone have any suggestions
RuaRi said:The sensing part of the circuit works fine(most of the time) its a problem with getting the timer to trigger for a few minutes, I'm using a cmos 555 so I thought there wouldn't be any problem with using large resistances to control the timer. I'm using a 100µF tantulum bead capacitor.