What is a uln2803 IC?
What is a uln2803 IC?
The heart of this circuit is a ULN2803 IC. The Working of this circuit is pretty simple, the base terminal of all transistors are connected from PIN 1 to PIN 8 (1B – 8B), functioning as an individual probe for each level, while the positive rail is used as the bottom probe going through the container/reservoir.
Is uln2803 a high voltage Darlington transistor?
The datasheet of ULN2803 specifies that this chip is a high current, high voltage Darlington transistor array. In this device, eight Darlington pairs of np-n configuration are present that have the feature of high voltage outputs along with the common-cathode clamp diodes that is used to switch inductive loads.
Why uln2803 chips are not suitable for high voltage applications?
All these chips operate at either 0 volts or 5 volts thus these are not capable of driving loads of high inductive power. The ULN2803 chips take the low-level signals at input side i.e. TTL and make use of that low-level signal in switching off loads of higher voltage present at the output side.
