Avradip
Junior Member level 1
Hi,
I am Avradip .I am studying a sample motion detection circuit which uses PIR sensor D203S and motion detetor IC BISS0001.The output of sensor directly connected to BISS0001 and after several stage of amplification it gives output(Vo) which switches SCR. SCR switches TRIAC which is used for general purpose ac switching.But i didnt understood the role of some of components . In circuit they used 7.5V zener diode across triac gate terminal.But what is the purpose of using this zener diode ? when SCR switches triac the voltage across the zener shows around 3.3 voltage then how is it possible to on the zener and triac respectively. Again they used another 7.5V zener which is shown in red marking. i didnt understood the functionality of these zener .I will be very grateful if anyone help me.
I am Avradip .I am studying a sample motion detection circuit which uses PIR sensor D203S and motion detetor IC BISS0001.The output of sensor directly connected to BISS0001 and after several stage of amplification it gives output(Vo) which switches SCR. SCR switches TRIAC which is used for general purpose ac switching.But i didnt understood the role of some of components . In circuit they used 7.5V zener diode across triac gate terminal.But what is the purpose of using this zener diode ? when SCR switches triac the voltage across the zener shows around 3.3 voltage then how is it possible to on the zener and triac respectively. Again they used another 7.5V zener which is shown in red marking. i didnt understood the functionality of these zener .I will be very grateful if anyone help me.
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