kiranhatti
Newbie level 6
![Newbie level 6](/styles/images/ranks/blevel3.gif)
LM7912 regulator output is setting down to zero after the current is drawn by the load. Here I am attaching power supply circuit and DAC circuit. My project is the sensor from the field will give 8 to 48 mA output and which is read by the ADC. After it will be taken to the microcontroller and it will be sent to DAC and the output of the DAC is 4 -20 mA.
Whenever the unit is switched on for some time the output of the DAC is going 45mA which is out of our scaling. There is no linearity between input mAmps and output mAmps. Whenever the output of DAC is 45mA , the output of the 7912 regulator is 0V.
Please let me KNOW is it because of regulator or some other component.?
Whenever the unit is switched on for some time the output of the DAC is going 45mA which is out of our scaling. There is no linearity between input mAmps and output mAmps. Whenever the output of DAC is 45mA , the output of the 7912 regulator is 0V.
Please let me KNOW is it because of regulator or some other component.?
Last edited by a moderator: