What could these components be?

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zacsophonist

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These parts have stumped me.
After doing some research, I've come to these conclusions:
Part A: Either a TVS diode or TVS thyristor?
Part B: Inductor
Part C: Another inductor of sorts? If so, why would there be two? (Device input is 12V, and there are both 12V and 5V outputs on this device)
Part D: no idea..

Thank you,
Z

 

Solution
1. 3D models are no photos. Some deviations from actual appearance can be expected.
2. It's no real PCB, just a few parts placed unconnected on a background. In so far, it's useless to ask why you have e.g. two different inductors on the picture. There could be thousand other types.
3. 4-pin package A is typically used for low current bridge rectifier or optocoupler.
4. D is a power IC, e.g. output driver.
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1. 3D models are no photos. Some deviations from actual appearance can be expected.
2. It's no real PCB, just a few parts placed unconnected on a background. In so far, it's useless to ask why you have e.g. two different inductors on the picture. There could be thousand other types.
3. 4-pin package A is typically used for low current bridge rectifier or optocoupler.
4. D is a power IC, e.g. output driver.
 
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Solution
Thank you, FvM.
I know it's challenging to figure out what could be going on here since it isn't a real PCB, but your insights will help me move forward.
 

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A looks like a Bridge Rectifiier
 
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