Ib Ic / DC gain 0.4A / 2000 200uA, usually we take Ib 5x bigger to be sure it is saturated 1mA. In order to switch 400mA you need base current. You could calculate the timing for the power to be supplied to this unit and have the valve rest at specific degree for accurate water flow dispensing. The DC gain 400mA is 2000 for TIP120 (for a normal transistor about 100).
#Tip120 transistor arduino full
The valve, once constant power is provided to either red or blue pin will take 6 seconds to lock into full position.
You musn't supply voltage to the red and blue cable at the same time, as it may damage the device. 10mA Base current is plenty enough to fully switch the TIP120.
This provides very high current gain, but doubles the required Base bias voltage and increases the Collector saturation voltage. Applying 12VDC to Red cable will cause the valve to open and removing the voltage from red and applying to blue wire will cause the valve to close. The TIP120 is a Darlington transistor pair, which consists of two transistors with the Emitter of the first one connected to the Base of the second one. You can use a bipolar Darlington transistor like the TIP120, or you can use a. Yes, the TIP120 is an old darlington transistor, dont bother with it as its best used by date was about thirty years ago. This product has three contact pins, yellow is designated as ground. Lab: Using a Transistor to Control High Current Loads with an Arduino. Motorized Brass Ball Valves are effective tools for controlling water-flow by simply sending an voltage to either red or blue pin to toggle the valve to open or close at certain time intervals.
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