Figure 8-59(a) shows a 7406 open-collector inverting buffer used to control the ON/OFF status of an LED to indicate the state of FF output Q. The LED’s nominal specification is V_F = 2.4 V at I_F = 20 mA, and I_F(max) = 30 mA.

(a) What voltage will appear at the 7406 output when Q = 0?

(b) Choose an appropriate value for the series resistor for proper operation.

Figure 8-59

Transcribed Image Text:

J K 74LS112 Q 10 7406 +5 V Rs O 7406 (b) +12 V Relay coil