Tune that dial - Index of
Tune that dial - Index of
Tune that dial - Index of
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3<br />
3k9<br />
22k<br />
Two BA482 switching diodes (D2 and<br />
D3) have been used to switch between<br />
the pre-amplifier and the input for an<br />
external aerial. This type <strong>of</strong> diode has a<br />
very low AC resistance when a certain<br />
forward current flows through it.<br />
LD6<br />
SC52-11GWA<br />
a<br />
b<br />
10<br />
CC dp<br />
7<br />
6<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
9<br />
f<br />
g<br />
5<br />
CC<br />
3 8<br />
12/2006 - elektor electronics<br />
R1<br />
R2<br />
C'<br />
BC557B<br />
R3<br />
C41 K1<br />
1k T1<br />
LD5<br />
SC52-11GWA<br />
a<br />
b<br />
100n<br />
KEYPAD<br />
ENCODER<br />
DISPLAY<br />
10<br />
CC dp<br />
7<br />
6<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
9<br />
f<br />
g<br />
5<br />
CC<br />
3 8<br />
K4<br />
C2<br />
33p<br />
40<br />
8MHz<br />
L1<br />
100µH<br />
31<br />
ICP<br />
OC1B<br />
29<br />
AT90S8515<br />
10<br />
PD0(RXD) PA0(AD0)<br />
39<br />
11<br />
PD1(TXD) PA1(AD1)<br />
38<br />
12<br />
PD2(INT0) PA2(AD2)<br />
37<br />
13<br />
PD3(INT1) PA3(AD3)<br />
36<br />
14<br />
PD4<br />
PA4(AD4)<br />
35<br />
15<br />
PD5(OC1A) PA5(AD5)<br />
34<br />
16<br />
PD6(WR) PA6(AD6)<br />
33<br />
17<br />
PD7(RD) PA7(AD7)<br />
32<br />
X1 X2<br />
20 19 18<br />
X1<br />
C3<br />
33p<br />
C1<br />
100n<br />
C10<br />
100n<br />
IC6<br />
78L05<br />
9<br />
RESET<br />
30<br />
ALE<br />
IC1<br />
1<br />
PB0(T0)<br />
2<br />
PB1(T1)<br />
3<br />
PB2(AIN0)<br />
4<br />
PB3<br />
5<br />
PB4(SS)<br />
6<br />
PB5(MOSI)<br />
7<br />
PB6(MISO)<br />
8<br />
PB7(SCK)<br />
PC0(A8)<br />
PC1(A9)<br />
PC2(A10)<br />
PC3(A11)<br />
PC4(A12)<br />
PC5(A13)<br />
PC6(A14)<br />
PC7(A15)<br />
21<br />
22<br />
23<br />
24<br />
25<br />
26<br />
27<br />
28<br />
L3<br />
L4<br />
L5<br />
L6<br />
L7<br />
L8<br />
L9<br />
100µH<br />
100µH<br />
100µH<br />
100µH<br />
100µH<br />
100µH<br />
100µH<br />
C12 C13 C14 C15 C16 C17<br />
AM<br />
FM<br />
LSB/USB<br />
SSB<br />
NARROW<br />
MEDIUM<br />
WIDE<br />
C18<br />
C40<br />
10n<br />
AM<br />
AM<br />
FM<br />
FM<br />
LSB/USB<br />
SSB<br />
SSB<br />
NARROW<br />
NARROW<br />
MEDIUM<br />
MEDIUM<br />
WIDE WIDE<br />
LSB/USB<br />
LD4<br />
SC52-11GWA<br />
a<br />
b<br />
10<br />
CC dp<br />
7<br />
6<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
9<br />
f<br />
g<br />
5<br />
CC<br />
3 8<br />
LD3<br />
SC52-11GWA<br />
a<br />
b<br />
10<br />
CC dp<br />
7<br />
6<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
9<br />
f<br />
g<br />
5<br />
CC<br />
3 8<br />
A'<br />
B'<br />
C11<br />
+U<br />
100n<br />
100n 100n 100n 100n 100n 100n 100n<br />
C23<br />
C24 C27<br />
L12 L10 L13<br />
C25<br />
C26<br />
4x<br />
6 23 11 18 3x<br />
100n<br />
PVCC DVDD AVDD AVDD<br />
100n<br />
4<br />
D0<br />
3<br />
D1<br />
2<br />
D2<br />
1<br />
D3<br />
28<br />
D4<br />
IC3<br />
15<br />
VINN<br />
9<br />
REFCLK<br />
27<br />
D5<br />
VOUTN<br />
13<br />
26<br />
D6<br />
VOUTP<br />
14<br />
25<br />
D7<br />
DACBP<br />
17<br />
7<br />
AD9851BRS<br />
WCLK<br />
8<br />
FQUD<br />
22<br />
RST<br />
IOUT<br />
21<br />
16<br />
VINP<br />
12<br />
RSET<br />
IOUTB<br />
20<br />
R6<br />
PGND DGND AGND AGND<br />
R7<br />
5 24 10 19<br />
4k7<br />
10µH<br />
+5VA<br />
10µH<br />
+5VA<br />
10µH<br />
IC7<br />
7805<br />
From the aerial switch the signal is fed<br />
into a low-pass filter consisting <strong>of</strong> inductors<br />
L1 to L3 and capacitors C11<br />
to C17. These form a Cauer-like filter,<br />
which cuts <strong>of</strong> steeply at 30 MHz and<br />
which has a fairly flat transfer function<br />
LD2<br />
SC52-11GWA<br />
a<br />
b<br />
10<br />
CC dp<br />
7<br />
6<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
9<br />
f<br />
g<br />
5<br />
CC<br />
3 8<br />
4<br />
9<br />
C19<br />
100n<br />
19 18<br />
LD1<br />
SC52-11GWA<br />
ISET<br />
1<br />
DIN<br />
13<br />
14 IC2 CLK<br />
SEGA<br />
12<br />
16<br />
LOAD<br />
SEGB<br />
20<br />
SEGC<br />
23<br />
SEGD<br />
DIG7<br />
DIG6<br />
8<br />
5<br />
21<br />
SEGE DIG5<br />
10<br />
15<br />
SEGF DIG4<br />
3<br />
10<br />
CC<br />
17<br />
SEGG DIG3<br />
22<br />
SEGDP DIG2<br />
DIG1<br />
MAX7219<br />
24<br />
DOUT DIG0<br />
7<br />
6<br />
11<br />
2<br />
dp<br />
220μ 16V 100n<br />
a<br />
7<br />
6<br />
b<br />
4<br />
c<br />
2<br />
d<br />
1<br />
e<br />
f<br />
9<br />
g<br />
5<br />
CC<br />
3 8<br />
C28<br />
C29<br />
100 Ω<br />
C20<br />
100n<br />
22p<br />
R10<br />
100 Ω C34<br />
S1<br />
ENCODER<br />
+U<br />
K3<br />
C<br />
L15<br />
330nH<br />
+U<br />
C4<br />
100n<br />
13<br />
R8<br />
10k<br />
IC4.F<br />
1<br />
12<br />
X2<br />
+U<br />
10MHz<br />
C36<br />
68p<br />
IC5<br />
7805<br />
1<br />
IC4.A<br />
1<br />
2<br />
3<br />
IC4.B<br />
1<br />
4<br />
L16<br />
100nH<br />
IC4.E<br />
11 10<br />
1<br />
C31<br />
10p<br />
C30<br />
40p<br />
C5<br />
100n<br />
C32<br />
22p<br />
R4<br />
4Ω7<br />
C6<br />
220µ<br />
16V<br />
+5VA L11<br />
100µH<br />
C21<br />
C22 14<br />
IC4<br />
100n 100n 7<br />
IC4 = 74HCU04<br />
C35<br />
L17<br />
820nH<br />
L18<br />
1µH<br />
C38<br />
10p<br />
27p<br />
C37<br />
68p<br />
L20<br />
100nH<br />
L19<br />
330nH<br />
C39 R11<br />
68Ω<br />
6p8<br />
Figure 2. Schematic for the receiver section. There is a heap <strong>of</strong> components, but with the help <strong>of</strong> the block diagram you should be able to recognise the different sections.<br />
+5VD<br />
9<br />
R9<br />
10k<br />
IC4.D<br />
1<br />
8<br />
L14<br />
1µH2<br />
IC4.C 5<br />
C33<br />
1<br />
220p<br />
6<br />
Figure 3. The electronics for the microcontroller board. The wiring diagram at the bottom-left shows how K3 and K4 on the receiver board should be connected to K3 on the microcontroller board.<br />
Figure 4. This part is on the display board: display driver, six-digit 7-segment display, rotary encoder and a keypad with 16 keys.<br />
4<br />
+5D<br />
+5VD<br />
C7<br />
100n<br />
L2<br />
100μH<br />
C8<br />
C9<br />
10k<br />
R5<br />
K5<br />
ENCODER<br />
DISPLAY<br />
030417 - 12b<br />
030417 - 12a<br />
68Ω<br />
R12<br />
Synth.<br />
from 0 Hz onwards. The input and output<br />
impedance <strong>of</strong> this filter is 50 Ω.<br />
Following this input filter is the first<br />
mixer (MIX1). We have used an ASK-1<br />
diode-ring mixer made by Mini-Circuits<br />
Labs because <strong>of</strong> its ability to handle<br />
S14<br />
1<br />
S15<br />
4<br />
S16<br />
7<br />
S17<br />
*<br />
S10<br />
2<br />
S11<br />
5<br />
S12<br />
8<br />
S13<br />
0<br />
S6<br />
3<br />
S7<br />
6<br />
S8<br />
9<br />
S9<br />
#<br />
K2<br />
+5D<br />
K6<br />
S2<br />
A<br />
S3<br />
B<br />
S4<br />
C<br />
S5<br />
D<br />
KEYPAD<br />
030417 - 12c<br />
29
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