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transistor amplifier can also be used as a switch. how to provide a large enough current at the base of the transistor to reach saturation. under conditions such as a collector and emitter like a wire connected or a switch closed, and vice versa if the base current is very small, the collector and emitter are like switches open. with switching properties like this transistors can be used as gateways or what we often hear as ttl, namely transistor logic transistors. gate not is a gate that serves to reverse the logic value. if the input is logic 0 then the output will be logic 1 and vice versa. in the above circuit if we press or activate the sw1 switch, the light will turn off and if we open the sw1 switch the light will turn on. the working principle of the gate note circuit above is to give 0 volts to the emitter base when the switch is immediately short with ground. where the voltage that falls on the 0 ohm resistance is 0 volts according to the voltage divider formula or in other words the current that should enter the base is all directly grounded via the sw1 switch. otherwise when the switch sw1 is opened the current will flow at the base of the transistor q1 so that the light will turn on. gate and is a gate that functions to multiply logic. if one of the gate input logic and logic 0 then any condition of the other input logic then the output will remain 0. output which logic 1 is obtained if all inputs from the gate and in the circuit above the position of the two input switches are connected series so if one the input switch opens, the transistor still won't get the current to be active. but if the two switches are activated then the current will flow and the transistor will be active like a wire connected and turning on the light. gate or is a gate that serves to sum up the input logic. in principle, the sum of logic in digital electronics