Yeah, the center pin is positive, just like the specifications require. It says 12V 1A on the box but seems to be 15V DC when measured. However both the arduino or the 9V regulator overheat like crazy when plugged in. The datasheet for my 9V regulator says it is good to regulate sources up to 30V, so how come 15V overheats it. And i did check the polarity.I don't get it.
Second, do I understand you correctly that you replaced the 7805 ( 5V ) regulator on the Arduino with a 7809 (9 V)? Someone correct my if I'm wrong but I don't think the AVR chip would tolerate that high a supply voltage on it's Vcc pin.
It seems the power jack is directly linked to the Vin pin. So i'm wondering how much amperes can go through the Vin pin of the arduino uno?
QuoteIt seems the power jack is directly linked to the Vin pin. So i'm wondering how much amperes can go through the Vin pin of the arduino uno?Well there is a nominal rated one amp series polarity protection diode wired between the extenal power connector and the Vin pin.Lefty
256 LEDs - that could be a _lot_ of current. The Arduino signal pins can source about 30mA each before getting close to absolute maximum rating. The chip itself can only take 150mA through ground and Vcc pins. How much current is each LED taking? You know USB cannot supply more than 500mA??
will the high amperage burn the arduino?
I went back to the store and got a 5V 4A transformer
I hope you did not mean this, I hope it was a power supply not just a transformer. A transformer supplies AC and need rectifying and smoothing before connecting to the arduino.