Specifications

CONSTRUCTION
with component side serving as
a ground plane. From component
side, copper foil has been etched
from around all holes except
those connected to ground. Ac-
tual-size solder-side track layout
is shown in Fig. 6. Component
layout for the PCB is shown in
Fig. 7. The author’s prototype is
shown in Fig. 8.
TABLE III
IC1 (NE 564)
Pin no: 1 2 3 4 5 6 7 8
Voltage (V): 7.5 1.5 1 6.5 6.5 3 1 0
Pin no: 9 10 11 12 13 14 15 16
Voltage (V): 1 4.5 1 2 2 4 1.5 0.5
IC2 (NE592)
Pin 12 3 45 678810
Volt 9V 0V 9V 8.5V 0V 0V 9V 9V 0V 12V
Pin 11 12 13 14
Volt 8.5V 8.5V 0V 9V
Transistors
Base Emitter Collector
T1 3.2V 3.2V 7V
T2 7V 7V 12V
T3 8.2V 8.2V 12V
T4 7V 7V 12V
T5 7V 7V 12V
T6 2V 0V 2V
Testing
After completion of assembly and con-
struction, check the +12V and +18V DC
from power-supply regulator, before con-
necting it to the PCB. Now connect both
the supplies to PCB and check that +18V
is available at the input ‘F’ socket of tuner
module. Then connect the dish/LNB lead
to the tuner and connect the audio and
video output from receiver either to the
modulator or to the audio- and video-in-
put terminals of the TV set.
Switch ‘on’ the receiver and adjust
channel-selection potentiometer VR1 to
select the desired channel. Audio can be
fine tuned using potmeters VR1 and VR2.
Audio amplitude can be adjusted with the
help of potmeter VR3. Picture contrast is
to be adjusted using potmeter VR4.
In case the receiver does not work
properly, refer to the circuit diagram and
check its connections. Check thoroughly
all the connections and resolder if you
find any dry joints. Finally, check the volt-
ages at the pins of IC5 and transistors,
as given in Table III, for any major
discrepencies.
❏
Fig. 8
109