A very good designed circuit of a stable adjustable DC regulator using IC LM317T. LM317T is a very famous IC and supporting input voltage is from 3 volt to 40 volt DC and delivers a stable output between 1.25 volt to 36 volt DC.
This controller is designed to control small 12VDC electric doors - chicken, garage, gate ets.
Have build in 2 timers, for open and close the door, with reversing the polarity. Each timer is adgustable from 0 to 25 sec
With build in LIGHT SENSOR with adjustable sensitivity for automatic open and close the door on sunrise and sunset.
Have led indication for working timer yellow - in one direction, red - in other direction, green - for active light sensor