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2. DESCRIPTION OF PINS
Pin
Function
No.
wave Information
EXT
1
AUDIO
IN
SOUND
2
DET
COIL
SOUND
3
DET
OUT
4
AF OUT
Voltage and
3.25V
2.5V
0.01
µF
3.75V
(Varies with
coil position)
4.2V
Peripheral circuitry
9V
4.7k
18k
3.9k
2k
30p
25k
10k
20p
25k
9V
10k
2.4k
2.4k
18k
2k
23k
9k
76
Circuit description
The Input impedance is
18kΩ. Add bias to the
2.4k
outside as shown right
for use.
2.4k
4.5V
The EM detector is a
10k
quadrature detector and
externally connects to a
10k
tank coll or discrimina-
tor.
5p
This is also used as an
AV switching pin to
apply voltage through a
10kΩ.
GND to EXT(Y-DL)
OPEN to TV(Y-DL)
Vcc(5V) to TV(S input)
Sound detector output
pin.
for de-emphasis, con-
nect a capacitor
between this pin and
GND.
4.5V
Sound output pin
through ATT.
5.0V
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