transistors

Could anyone please explain me the circuit? Especially the role of the 100 ohm resistor. In addition, which of the transistors conducts in positive and negative input? Thank you.

Hi! I'm a student of Electric Engineering and I got a problem on a Electronic project. I have to make an 8-bit shift register with serial input and serial output. The basics of the project is that it has to have two push buttons: one will be a logic 1 and the other a logic 0. The shift register...

Hey everyone, As part of a larger project I need a circuit that functions like a SPDT relay, but also need an 'OFF' position. It is a rather complex application but, to explain it simply, I have a switch that has two solenoids attached to it. One solenoid moves it 'on' and the other moves...