TK-5210
(
G
)
19
FM IC
IC204
L201
BPF
1st Local OSC
2nd Local OSC
Q205
TUNE
Tripler
X3
Q202
LNA
XF201
MCF
49.95MHz
Q204
IF AMP
CF201
L202
BPF
X201
16.8MHz
VCXO
L204
BPF
L205
BPF
IC202
MIXER
CIRCUIT DESCRIPTION
3-5. Audio Amplifi er Circuit
The AF signal from ASIC (IC10) is fi ltered for anti-aliasing
and to eliminate unwanted spectrums to hear. Next, the AF
signal goes through an electronic volume control (IC10) to
be adjusted its level and a buffering AF amplifi er IC506. Fi-
nally the AF signal into the audio power amplifi er (IC11, 12).
Fig. 3 Wide/Narrow/P25 switching circuit
Fig. 4 Audio amplifi er circuit
The audio output can be provided to external speaker
(CN505 12pin, 13pin) or internal speaker (CN34 1pin, 2pin,
3pin, 4pin). When INAMT signal is H, AF signal loads CN34.
When EXAMT signal is H, AF signal loads CN505.
ASIC
IC10
IC506
IC510
IC11
INT SP
EXT SP
IC12
DAC
IC502
IC13
IC9
Fig. 2 Receiver section
CF204
Narrow/P25
IC204
FM IC
CF203
Wide
VCXO
X201
CF201
Q205
2nd Lo
x3
CF250
IC250
ASIC
1st IF
IC206
IC207