| Electronics > Beginners |
| Sensing 12v line with 5v MCU |
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| floobydust:
--- Quote from: vmallet on April 25, 2019, 06:55:27 am --- --- Quote from: floobydust on April 24, 2019, 07:04:19 pm ---Typical levels are 12V vehicles +100V and -150V spikes max., 24V trucks are +200V and -600V spikes max. --- End quote --- I understand the 600v PIV in your design to be super safe on the spikes, but why the 1A rating? --- End quote --- The 600V 1A S1J diode is a jellybean part, lowest cost. Smaller diodes are to 400V max. and not much for popular parts <500mA. Using the PC817 opto-coupler will work too. You have to design for CTR dropping due to age (-50%) and at high temperatures. |
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