However, this is not a big issue because almost all 12V DC white LED modules work well with 9V DC onwards. Therefore, the white LED light source receives a slightly lower operating voltage than the input 12V DC. Likewise, the 700mA (IC max) small-signal transistor S8050 has a VCE(SAT) close to 500mV (IC=500mA, IB=50mA). 2: Internal power supply circuit of Arduino There is an inherent voltage drop of around 700mV, though. This voltage is used to power the white LED light source. ![]() 2), the DC voltage appears at its Vin pin through M7 (1N4007) silicon diode that is connected in series with the positive rail. When the Arduino board is powered through its DC input jack (see Fig. The 1-kilo-ohm resistor R1 is the base resistor of driver transistor T1. Pin 9 of the Arduino drives the white LED light source LED1 through the S8050 high-current transistor T1.
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