Without knowing more about the circuit, this question cannot be answered.
This mechanism is how a transistor works.
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tda 4935 equilent ic IC TDA 4935 equilent
What is a 2N2369 transistor.It's an npn switching transistor.
It is an npn power transistor
A small signal NPN transistor used for general purpose audio amplifiers and switching.
RTL logic: NPN transistor. Emitter grounded. Input connected to base through a resistor. Vcc also connected to base through a resistor. If the input is high or open, the transistor is on. If the input is low, the transistor is off. Connect a resistor from Vcc to the collector. The collector is the ouput. You have to play around with resistor values to setup your fan-in and fan-out properties.
2N2222
is zero
BT169 is neither an NPN nor a PNP transistor. BT169 is a thyristor, otherwise known as a silicon controlled rectifier.
Generally upstream is closer to the positive (+) voltage source. In the case of an NPN transistor upstream of the transistor is the part of the circuit from (+) to the NPN collector pin. Downstream of the transistor is from the NPN emitter pin to the ground / sink / negative (-) terminal.
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