Timeline for Powering arduino and 12V Fan from same supply
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Oct 2, 2015 at 9:40 | comment | added | aelgn | I see. So I would put two diodes in serial on the RAW pin? | |
| Oct 2, 2015 at 9:38 | vote | accept | aelgn | ||
| Oct 2, 2015 at 9:38 | |||||
| Oct 1, 2015 at 14:45 | comment | added | Gerben | Why wouldn't you trust a 12v switching power supply? Maximum voltage of the mic5205 is 16Volt (absolute maximum 20Volt). Using a zener is a very crude way to make a voltage regulator. If anything, I'd just add one or two diodes. Those will drop the voltage by around 0.6Volt each. Added bonus is, that it will protect your board in case you accidentally connect the powersupply the wrong way around. | |
| Oct 1, 2015 at 14:39 | comment | added | aelgn | I was thinking that I had to connect the fans in serial and that it would mean they got half the voltage each. but I guess I could just connect them both to the Collector of the transistor? But would I need to put a resistor/zener to protect the Arduino, or will it work without it, is it considered good practice? | |
| Oct 1, 2015 at 12:04 | comment | added | Igor Stoppa | Yes, you can put a resistor. You could also put a zener, to clip just the extra voltage. | |
| Oct 1, 2015 at 12:03 | comment | added | Igor Stoppa | Why would the fan get 6V? | |
| Oct 1, 2015 at 11:30 | comment | added | aelgn | I think I trust the supply, I'm a trusty person :). I don't need to control the fans separately, in fact the PCR PID system I'm building would benefit from both fans being in sync. I guess that having only one transistor the fans would get max 6V and thus run at half capacity? Since the Arduino itself really doesnt need the 12V, should I put a resistor on the RAW pin to limit power supply voltage? | |
| Oct 1, 2015 at 11:01 | history | answered | Igor Stoppa | CC BY-SA 3.0 |