| Electronics > Projects, Designs, and Technical Stuff |
| 14.4V ground reference for ADC |
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| Simon:
You are on a tight budget but you are making it expensive for yourself. You are using 2 chips instead of 1. the opamp to create the ground reference and the isolator. Isolators are not cheap but it's your money you are throwing away. Learn this, engineering done to silly budget constarints at best just fails and at worse kills people. You do not have to use the current sense chip I suggested, there are loads of them and many cheaper than the TI one. If you think a programmer can design power electronics and signal processing then think again! Learn about the building blocks and use them. Don't do the wrong solution just begcause it is the only one you know. Let me guess, does the voltage regulation happen in the microcontroller by any chance? |
| Arjunan M R:
The voltage regulation is done using a DAC which is controlled by a MCU.I will take your words for my next project because I have really done a dumb thing I already ordered the adc and isolater |O don't worry about the opamp it's just an lm358.Thanks for your reply. |
| Simon:
That won't work. A µC is too slow to react to load changes plus the conversion and communication time of the ADC. Contrary to what youtube channels like Great Scott say using a microcontroller inside such a critically fast control loop does not work. You could even use the LM358 to measure you current sense resistor now that you have it but specific chips for this job which are essentially a special purpose opamp cost pence/cents. So what type of voltage regulator is this? what is doing the power control? |
| Simon:
You could also use the LM358 to do the voltage regulation. |
| Simon:
You can use digital stuff to monitor the regulator and give YOU feedback but not the main regulation loop. |
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