Altronics K 5171 Podręcznik - Strona 8
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Drukuj stronęK 5171
Main module
1 double-sided PCB, code 01111119, 216 x
66mm
1 universal remote control [Altronics A1012 or
similar]
1 dual-gang 5kΩ log motorised potentiometer
(VR1) [Altronics R1998] (a 20kΩ log pot can
be substituted)
2 dual-gang 10kΩ linear 16mm
potentiometers (VR2,VR3) [Altronics R2296]
1 1kΩ mini horizontal trimpot (VR4)
3 knobs to suit VR1-VR3
1 4PDT push-on, push-off switch (S4)
[Altronics S1451]
4 8-pin DIL IC sockets (for IC1-IC4)
1 18-pin DIL IC socket (for IC5)
4 ferrite beads (FB1-FB4) Altronics L5250A,
1 4MHz crystal (X1)
2 vertical PCB-mount RCA sockets, white
(CON1,CON3) [Altronics P0131]
2 vertical PCB-mount RCA sockets, red
(CON2,CON4) [Altronics P0132]
1 3-way PCB-mount terminal block, 5.08mm
pitch (CON5)
1 2-way vertical polarised header, 2.54mm
pitch (CON6) [Altronics P5492,
1 2-way polarised header plug (for CON6)
Altronics P5472 & P5470A]
1 10-pin PCB-mount IDC vertical box header
(CON7) [Altronics P5010
1 2-way SIL pin header (LK3)
1 3-way SIL pin header (LK4)
2 jumper shunts (LK3,LK4)
1 6.35mm chassis-mount single spade
connector
4 12mm long M3 tapped Nylon spacers
1 M4 x 10mm panhead machine screw
1 M4 hex nut
1 M4 star washer
4 M3 x 6mm panhead machine screws
2 100mm cable ties
1 150mm length of light-duty figure-8 hookup
wire
1 50mm length of 0.7mm diameter tinned
copper wire
1 PC stake
VR2 and VR3 must be seated correctly before
being soldered to the board. They are then
earthed using 0.7mm diameter tinned copper
wire soldered to the GND PCB stake and the
top metal shield on both pots. Make sure that
you apply sufficient heat for the solder to form
a good joint.
Mounting the LEDs and IRD1
We mounted the infrared receiver lRD1 with
its lens about 18mm above the PCB. Similarly,
the LEDs were mounted with the base of the
LED body 18mm above the PCB. This will
allow sufficient length for the LED leads to be
bent forward, to line up with the potentiometer
shafts, and then poke forward through the
front panel of the amplifier.
8
ULTRA LOW DISTORTION PREAMPLIFIER WITH TONE CONTROLS
Parts list
Semiconductors
4 NE5532AP or LM833P dual op amps (IC1-
IC4)
1 PIC16F88-I/P microcontroller programmed
with 0111111A.hex (lC5)
1 infrared receiver module (IRD1) Altronics
Z1611A
1 7805CV 5V regulator (REG1)
2 BC327 PNP transistors (Q1,Q3)
2 BC337 NPN transistors (Q2,Q4)
1 3mm blue LED (LED1)
1 3mm orange/amber LED (LED2)
1 3mm yellow LED (LED3)
Capacitors
2 470µF 16V PC electrolytic
3 100µF 35V PC electrolytic
8 100µF 16V PC electrolytic
8 22µF small non-polarised electrolytic
2 4.7µF small non-polarised electrolytic
11 100nF MKT polyester
4 15nF MKT polyester
1 10nF MKT polyester
4 470pF MKT polyester, MKP polypropylene
or NP0 ceramic
[eg, element14 1005988]
2 47pF MKT polyester, MKP polypropylene or
NP0 ceramic
[eg, element14 1519289]
2 22pF ceramic
Resistors (all 0.25W, 1% metal film)
2 1MΩ
6 100kΩ
2 12kΩ
3 10kΩ
1 2.7kΩ
1.8kΩ
10 1kΩ
2 330Ω
7 100Ω
When bending the LED leads, keep in mind
that the longer (anode) leads must go into the
pads marked "A" on the PCB. IRD1 should
be fitted with its hemispherical lens facing
towards the front of the board. The assembly
can now be completed by installing the spade
connector to the left of the motorised pot. It is
secured with an M4 screw, shake-proof washer
and nut. Leave the ICs out of their sockets for
now. They are installed later, after the power
supply checks have been completed.
Initial checks
Before installing the three ICs on the preamp
board, it's a good idea to check the supply
voltages. You will need to wire up a power
supply, then connect the supply's +15V, 0V
and -15V outputs to the relevant inputs on
the main preamplifier PCB. Now check the
voltages on pins 8 & 4 of the four 8-pin IC
sockets (IC1-IC4) on the preamp board; ie, be-
tween each of these pins and the 0V (centre)
terminal of CON6. You should get readings of
+15V and -15V respectively.
Similarly, check the voltage on pin 14 of
IC5's socket. It should be between +4.8V and
+5.2V. If these voltages are correct, switch
off and install the ICs. Note that IC1-IC4 face
one way while microcontroller IC5 faces the
other way.
Remote control/switch testing
The remote control functions can now be
tested using a suitable universal remote, eg,
Altronics A1012. As stated earlier, the default
device mode programmed into the micro is
TV but if this conflicts with other gear you can
choose SAT1 or SAT2 as the device instead.
Whichever mode is chosen, you must also
program the correct code into the remote
(see panel).
Note that if you don't have a split rail power
supply ready yet, you can still check the
remote control functions by using a single
9-15V DC supply connected between the
+15V and 0V terminals of CON6 (watch the
polarity). As before, check the voltage on pin
14 of IC5's socket (it must be between +4.8V
and +5.2V), then switch off and install IC5
(pin 1 towards IRD1). Also, insert the jumper
link for LK3 to enable the mute return func-
tion. Now connect the three boards using the
ribbon cable assemblies. The connectors are
all keyed so as long as you plug the 10-wire
2 22kΩ
1 18kΩ
cable into the 10-pin sockets and the 14-wire
cable into the 14-pin sockets, everything
8 2.2kΩ
4
should be connected properly.
1 22Ω
3 10Ω
Next, rotate VR2 fully anticlockwise and use
the remote to check the various functions. If
the 6-input selector board is used, connect
is using the 10-wire cable. The inputs can be
selected using the buttons on the pushbutton
board or the 1-6 buttons on the remote. Each
time a button is pressed, you should hear
a "click" as its relay switches on and the
blue LED in the corresponding switch button
should light.
Also, the orange Acknowledge (ACK) LED
should flash each time you press a button
on the remote. If the ACK LED doesn't flash,
make sure the code programmed into the
remote matches the device mode (ie, TV,
SAT1 or SAT2). The ACK LED won't flash at
all unless the code is correct. Now check that
the volume pot turns clockwise when the Vol-
ume Up and Channel Up buttons are pressed
and anti-clockwise when Volume Down and
Channel Down are pressed. It should travel
fairly quickly when Volume Up/Down buttons
are pressed and at a slower rate when the
Channel Up/Down buttons are used.
If it turns in the wrong direction, reverse the
leads to the motor.