bradosaurus
New Member
I am building an in-dash USB power supply for my personal electronics in my car. The power supply on the vehicle is dirty (meaning AC leakage/RF leakage/ground loop interference), and I would like to clean up the power supply.
Drawn in the picture is what I've come up with so far.
**broken link removed**
The diodes d1 and d2 will be on the primary 14.1 V supply (to clean up stray AC). The output (to USB connector) should be 5 VDC from the Zener diode, d3.
I am not very experienced with DC electronic circuits, which is why I'm asking for help.
Does this system seem reasonable? The capacitors (C1 and C2) and inductor (L) are (to my understanding) there to smooth the waveform and reduce the ripples, and the Zener diode and resistor are there to reduce the voltage from 12 to 5.
I would really like to truly understand the *why* of selecting the correct diodes, capacitors, etc., but any help I can get with this would be appreciated.
What specific diodes should I buy for D1 and D2?
I can't find >250mOhm capacitors in 12V. Do I need larger capacitors for a 2A system?
What inductor should I get? (and why, if you feel like sharing)
What resistor should I get? (I somehow calculated 4 Ohm, 14000mW)
What Zener should I get?
What effect will the power drop from each of the components have? I would like to target 5VDC output as best as I can.
Thank you very much for your help!
Drawn in the picture is what I've come up with so far.
**broken link removed**
The diodes d1 and d2 will be on the primary 14.1 V supply (to clean up stray AC). The output (to USB connector) should be 5 VDC from the Zener diode, d3.
I am not very experienced with DC electronic circuits, which is why I'm asking for help.
Does this system seem reasonable? The capacitors (C1 and C2) and inductor (L) are (to my understanding) there to smooth the waveform and reduce the ripples, and the Zener diode and resistor are there to reduce the voltage from 12 to 5.
I would really like to truly understand the *why* of selecting the correct diodes, capacitors, etc., but any help I can get with this would be appreciated.
What specific diodes should I buy for D1 and D2?
I can't find >250mOhm capacitors in 12V. Do I need larger capacitors for a 2A system?
What inductor should I get? (and why, if you feel like sharing)
What resistor should I get? (I somehow calculated 4 Ohm, 14000mW)
What Zener should I get?
What effect will the power drop from each of the components have? I would like to target 5VDC output as best as I can.
Thank you very much for your help!