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參數(shù)資料
| 型號： | SL490B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | REMOTE CONTROL TRANSMITTER |
| 中文描述： | 遙控器 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 136K |
| 代理商： | SL490B |
3
SL490B
Fig. 5 Infra-red application circuit
OPERATING NOTES
Fig. 5 shows the circuit for a simple infra-red transmitter where
the PPM output pulses from pin 2 of the SL490B are differentated
by C3 and R3 and amplified by TR1 to produce current pulses
about 15
μ
s wide.These pulses are further amplified by TR2 and
applied to the infra-red diodes D1 and D2.
The current in the diodes and the infra-red output is controlled
by the quantity, type, and connection method of the diodes and
also by the gain, at high currents, of the transistors.
The most common solution where cost is important is to use
two single-chip diodes, such as the CQY99 connected in series.
Improved output can be obtained by using four CQY99
diodes in a series/parallel arrangement, but it is usually simpler
to use two multi-chip diodes such as the CQX47 connected in
parallel or a single CQX19, which gives similar results.
A significant increase in range can be obtained by using
diodes such as the CQY99 in conjunction with a plated plastic
parabolic reflector.
When building the transmitter, care should be taken with the
choice of the capacitor C4 and with the circuit layout, particularly
when multi-chip diodes are being used, as the current pulses can
be as high as 6 to 8A.
Transistor choice is also important and any substitutes should
have high current gain characteristics and switching speeds
compatible with the application.
An increase in output can be obtained by connecting TR2 in
common emitter configuration, but care should be taken not to
exceed the rating of the diodes.
Choice of PPM Frequency
When the transmitter is being used with an infra-red link, with
high current pulses fed to the diodes as in Fig. 5, power
consumption will increase with frequency. It is thus advisable
that, with a battery power supply, the slowest PPM rate consistent
with adequate response time should be chosen.
9V
(PP3)
10
11
12
13
14
15
16
17
18
9
8
7
6
5
4
3
2
1
SL490B
C2
4·7
μ
, 6V
C1
0·22
μ
, 5%
2
3
CQY99
OR
1
3
CQX47
D1
D2
15k
R2
2·2k
R3
100
C3
68n
8
3
4
KEYPAD
47k
TR1
BC327
TR2
BD437
150
μ
10V
1
2
R1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SL490BNADP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:REMOTE CONTROL TRANSMITTER |
| SL494 | 制造商:SLS 制造商全稱:System Logic Semiconductor 功能描述:PWM Control Circuit |
| SL494D | 制造商:SLS 制造商全稱:System Logic Semiconductor 功能描述:PWM Control Circuit |
| SL494N | 制造商:SLS 制造商全稱:System Logic Semiconductor 功能描述:PWM Control Circuit |
| SL4-9-50 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SL4 Series Single-In-Line Passive Single Output 50 W Impedance Delays |
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