Panasonic KX-TS880MXB Service Manual page 22

KX-TS880MXB/KX-TS880MXW
10.1.2. RINGER IC (IC1)
Pin descriptions
Pin No. Pin name
1 Vcc
2 RSL
3 LFI
4 LFO
5 GND
6 HFO
7 HFI
8 OUT
Vcc 1
POWER SUPPLY
RSL 2
HYSTERISIS
LFI 3
LFO 4
Name
Power supply pin
RSL pin
Low-frequency time
constant connector pin
GND pin
High-frequency time
constant connector pin
Output pin
AMP
WITH
LOW FREQ HIGH FREQ
OSC OSC
This is the power supply pin for the lC. It is connected to the (
the diode bridge.
This is used to change the operation initiation current when connected
to the GND pin.
This is connected to the time constant that determines the oscillation
frequency on the warble.
This pin has the lowest potential on the lC. It is connected to the (
pin of the diode bridge.
This is connected to the time constant that determines the oscillation
frequency on the tone side (the audible frequency side).
This is used to connect a piezoelectric buzzer, or to connect a dynamic
speaker through a transformer.
22
8
OUT
7
HFI
6
HFO
5
GND
Function
) pin of
)