Elenco AM/FM Radio Kit - Manual (Page 23)

-22-
Vp = Vclp/2 Vp = ______
Vrms = Vp x 0.7 Vrms = ______
Max power out = (Vrms) 2 /8 Max power out = ______
Since the battery power equals the battery voltage times the current taken from the battery; calculate the battery
power:
Battery power = Imax x V supply Battery power = ______
Since the efficiency (N) is equal to the Max power out divided by the Battery power, we can now calculate the
efficiency of the audio amplifier.
N = Max power out/Battery power N = _______
N in % = N x 100 N = _______%
Your calculated answer should be around 0.5 or 50%.
Figure 21
GND
TP17
GND
TP17
Generator If you do not have a power supply,
use a 9 volt battery instead.
Power Supply
Oscilloscope
+ –