Transistors and integrated circuits

Explanation of question 4

In Fig. 14.3, the two separate supplies to be correctly connected to the terminals should be

1. A+ B- C+ D-
2. A+ B- C- D+
3. A- B+ C- D+
4. A- B+ C+ D-

The answer is :- 3 The polarities are shown in question 2 (Fig. 14.2).