Engineering Question about the BJT as switch circuit

[shinsj]

1. Homework Statement
my teacher wants me to design a circuit to control the on or off of 4 BJTs in the circuit.

Homework Equations

The Attempt at a Solution

so i tryed to control a BJT at once .. it workshttp://user.qzone.qq.com/259234914/infocenter#!app=4

but there were somewrong with control 2 bjt in the circuit .. the BJT can not work whatever i put the value of resistance in the circuit .http://user.qzone.qq.com/259234914/infocenter#!app=4

 

[vk6kro]

In the second diagram, the bases appear to be supplied from a negative voltage.