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An open-collector output is often used in sensors or microcircuits, such as comparators, to expand the capabilities of both the load connection and the voltage range. If a field-effect transistor is used as an output, then there will be an open-drain output. A bipolar transistor with an open collector opens when current flows in the base-emitter circuit, but its collector is not connected anywhere. Therefore, it can be connected to a power source, the voltage of which may differ from the supply voltage of the sensor or microcircuit. This allows you to implement the conversion of the level of logical signals, as well as connect a more powerful load. Gentleman's set of electronics: Get a big DISCOUNT on the purchase of ALL products: http://ali.pub/3mwkwb Breadboard: http://ali.pub/3mtvcu Convenient breadboard: http://ali.pub/3mtvyt Serious breadboard: http://ali.pub/3mtx4m Flexible jumpers for breadboard: http://ali.pub/3mtxj0 Jumpers in a pencil case 14 types 140 pieces: http://ali.pub/3mtxtw Set of resistors 600 pieces, 30 denominations of 20 pieces: http://ali.pub/3muaey Set of transistors: http://ali.pub/3muc1h Buy a good multimeter: RM113D http://ali.pub/3mn1ru Buy a simple multimeter: DT830B http://ali.pub/3mn8qo Pulse generator XR2206: http://ali.pub/4c1w62 ICL8038 Pulse Generator: http://ali.pub/4c1xmy Jds6600 Dual-Channel Digital Signal Generator: http://ali.pub/4c1zw8 DDS Dual-Channel Digital Signal Generator: http://ali.pub/4c2hf7 UNI-T UTG962 Serious Digital Signal Generator: http://ali.pub/4c2hx3 Hantek DSO5202P Oscilloscope: http://ali.pub/3rey34 CXG 936d Temperature-Controlled Soldering Iron: http://ali.pub/4c2kuh #transistor #collector #electronicsclub