Elenco AM Radio Kit - Manual (Page 17)

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ASSEMBLY INSTRUCTIONS - AM DETECTOR AND AGC STAGES
R8 - 100 Ω 5% 1/4W Resistor
(brown-black-brown-gold)
T3 - Detector Coil
(Black Dot)
TP5 - Test Point Pin
(see Figure E)
D1 - 1N4148 Diode
(see Figure H)
C15 - .001
μF Discap (102)
C10 - .01
μF Discap (103)
C6 - 100
μF Lytic Capacitor
(see Figure F)
R5 - 27k
Ω 5% 1/4W Resistor
(red-violet-orange-gold)
T1 - IF Coil (Yellow Dot)
TP3 - Test Point Pin
(see Figure E)
R11 - 3.3k Ω Resistor
(orange-orange-red-gold)
C4 - 10
μF Lytic Capacitor
(see Figure F)
C9 - .02
μF Discap (203)
or .022
μF Discap (223)
R12 - 2.2k
Ω Resistor
(red-red-red-gold)
STATIC MEASUREMENTS
Figure 14
With the power turned OFF, connect the VOM to test
point three (TP3) as shown in Figure 14.
Check that the VOM is adjusted to read 9 volts DC
and turn the power ON. The voltmeter should read
approximately 1.5 volts DC. If your reading varies more than .5 volts from this value, turn the power
OFF and check the polarity of D1, and resistors R11
and R5. Also check that transformer T1 is properly
installed.
AGC ZERO SIGNAL BIAS
With the power turned OFF, connect the positive lead
of the VOM to TP5 and the negative lead to any
ground. Make sure that the VOM is set to read 9
volts DC and turn the power ON. The voltage on the VOM should be the same as your battery voltage or
power supply voltage. If not, turn OFF the power and
check that T3 is properly installed.
T3 TEST
If you do not have an RF generator, go to Section 3.
V
Amps COM V/ Ω
TP8