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參數資料
| 型號： | LA4167M |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO30 |
| 封裝： | 0.375 INCH, MFP-30 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 372K |
| 代理商： | LA4167M |
LA4167M
No.4036-14/21
(4) Cue-tone (externally mounted cue-tone circuit)
+
47
μF
R8 500k
Ω
C1
VREF
10
9
8
20k
Ω
R7
0.47
μF
C11
C10
0.47
μF
R6
1M
Ω
Cue-tone begins to operate at the pin 8 ground, as shown in the figure above. The LED goes out at this time.
Capacitors C10 and C11 for cue-tone operation must be of high quality and of identical precision.
Capacitors C10 and C11 can be varied to change the cue-tone frequency. Increasing the capacitance of C10 and
C11 delays the frequency, and decreasing this capacitance hastens it. In the external circuit shown above, fOSC =
Approx. 15Hz.
(5) R/P mute (mute circuit during R/P switching)
In the mute circuit depicted above, a minute pulse is input to pin 21 as shown in the figure to switch from REC to
PLAY or from PLAY to REC. At this time, current is determined by:
IM =
E2 - E1
R13
In this case,
IM =
2.0V - 1.5V
30k
Ω
= 16.7
μA
Muting capacitors C19 and C20 are used to adjust the muting time: muting time increases when capacitance is high
and decreases when capacitance is low. Be aware, however, that if capacitance is excessive, power amp onset is
delayed when VCC is on. Capacitance of 0.1μF to 1μF is recommended.
If voltage over 1.6V is applied to the mute pin when VCC = 3.0V, each amp is muted. Be aware that application of
voltage higher than VCC in this case will disable muting.
The power, REC, VOX, and ALC amps can be muted.
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