I have a broken nano clone. I broke off a component under the USB connected to the bottom of the board trying to leverage it out of a solderless breadboard.
The component below and to the left is a 662K voltage regulator.
The component in the red box is a surface mount ceramic capacitors. Unfortunately these sorts of capacitors have no value written on them so try looking at the schematic of your clone.
I would expect it to be around 1uF.
I dont have a schematic. I searched but only found that image. But I have three of those clones so I can measure it directly. Thanks. I thought the yellow one was the cap and that one was a resistor. thanks
The problem with clones is that every manufacturer might have its own design. If you're lucky your board has the FTDI TTL-to-USB converter and follows the reference design; schematic version 3.2; an older one attached at the end.
If your board uses a CH340 TTL-to-USB converter, attached a schematic that was once posted on the forum; if your board uses it is the big question.
Clone
nano_ch340_schematics-rev1.pdf (851.9 KB)
Original 3.0
ArduinoNano30Schematic.pdf (60.5 KB)
It is also a capacitor but of a different value. Probably 0.1uF.
thanks but the clone I have has a 662K voltage regulator to the left and below the missing component and neither schematic seems to match. thank you I will add these to my library though.
Yes it does. The regulator type does not matter, it looks like that extra capacitor is on the same side as the other one:-
I was not sure. I was looking for the same 662K regulator circuit. I am a control systems engineer and retired. I just fiddle with this stuff as a hobby. I will get some parts. It looks a little bigger than a 0402. I am thinking 0603 or 0402.
Thank you again for helping me.
Rick
If this a voltage regulator capacitor - it is strange that the board doesn't work without it...
Could it be smd diode ?
I didn't know that the board didn't work without it. I thought the OP just said he dislodged it.
Anyway a regulator without sufficient capacitors can oscillate. Giving the impression that the board is not working.
There are many different types of voltage regulator. It is more than likely that your clone makers have picked the one that they could get for the cheapest money rather than use the one on any schematic. I would not get hung up on the actual type, they all do the same job.
Without tracing the PCB is hard to say. Cold be ferrite bead. Oscillations of the regulator are killed by the small caps. Measure if the pins are in parallel with the yellow brick, if they are not, I would run the board and briefly short this component. It is risky, this could damage the board!
Too risky in my opinion, plus I am not sure what it would tell you.
Yes, it is risky as I said. From other hand every output is current limited. This will tell me if this is series ferrite bead on some supply rail. I'll do that short if I am too lazy to trace the tracks there. But that's me. : )
I have 3 good nanos. It will be easy to completely remove a cap and test it to get its value.
No need you can measure capacitor values while the capacitor is on the board.
Thanks
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