Elenco AM Radio Kit - Manual (Page 14)

Figure 7
Battery
If an oscilloscope is not available, skip the following test and go directly to Section 2.
-13-
Output Adjust
Connect the VOM and generator to TP6 as shown in
Figure 7.
Turn the power ON. Normally the AC gain is measured
at a frequency of 1 kilohertz (kHz). Your VOM, however,
may not be able to accurately read AC voltages at this
frequency. It is recommended, therefore, that this test be
performed at 400Hz. Set the generator at 400Hz and
minimum voltage output. Set your VOM to read an AC
voltage of 1 volt at the output of your Audio Amplifier.
Slowly increase the output of the generator until the VOM
reads 1 volt AC. Leave the audio at this setting and move the positive lead of your VOM to TP6. Record the AC
voltage input to the amplifier here:
Vin=___________ volts.
You may have to change scales on your VOM for the
most accurate reading. Turn the power OFF. The AC
voltage gain of your Audio Amplifier is equal to the AC
output voltage divided by the AC input voltage, or 1/Vin.
Your calculated AC Gain should be approximately 10.
AC GAIN
GND
TP10
10
μF
Generator
GND
TP10