Figure 6,--Driver- 
amplifier fre- 
quency response 
with a 2-volt p-p 
input, 
OUTPUT— db(O dbre 2xl0~“*dynes /cm?) 
ne 
Ho 
100 
90 
80 
Figure 5,--A comparison of the 22 KHz distortion-free waveforms from 
(A) oscillator, (B) driver amplifier, and (C) microphone amplifier, Each 
vertical scale division represents 1 cm, In A the scale is 0,5 volt per 
centimeter; in B the scale is 20 volts per centimeter; and in C the scale 
is 2 volts per centimeter, 
20 30 40 50 60 70 80 90 
FREQUENCY — KHz 
100 
