LDR + PIR triggering 555 timer

ericgibbs

Joined Jan 29, 2010
18,623
hi edge,
As I explained earlier, the sensor FET is configured as a Source Follower, so a 47K Source resistor is required.
You had the Source shorted to 0v via a Transistor base/Emitter junction , the current through the sensor FET may have damaged it.?
E
EG57_ 1137.png
 
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