General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
The analog height sensor conversion circuit of the above circuit is given below. It is also in the...
This conventional relay light detector circuit uses a 741 as a voltage comparator. The sensitivity...
The passage of an object in front of the LDR, producing a shadow or even turning off the ambient...