Self-control 视频 switching exchanger, video switch DIY
关键 shape: 视频 switching exchanger, 视频 switching 换电 path, MAX454, CD4017, NE555
Sui deposition Currently 很多 监控 for 镜头 manner 价格 lowered, standing 您的 shops, 办公 chamber some Iesatoyasu Soichi 套监 视系 统变 obtained ratio 较实 fact. Natural 而你 也许 还得 considered 虑给 每个 监控 镜头 distribution 个监 示器, Aru买 one 个能 standing 单个 显示 Pingtung Same 时显 示多 个监 视 screen manner 专用 监示 device. More 这些 system, 其 it turned urban ratio 较大.这里 Kai绍 one 个可 以自 system basis 视频 switching exchanger.
它采 for 视频 switching 换专 glued laminated 电路, mosquitoes 以将 两, a three-some four 个镜 头的 监控 screen Yotsugi 显示 standing on one 个监 视器. Off 换镜 头的 quantity derived 电路 plate on the basis DIP 开关 Settings. Arasi 动模 expression under 间调 integer Noriyuki upper 镜头 manner switching 换速 degree Allowed derived faceplate manner 旋扭 从 1 Itaru 20 seconds. Hand 动模 formula o'clock, Kasho straight 监控 镜头 screen fixed stationary surveillance unit on, 并可 communication 过手 动触 发开 关来 逐个 copy system switching 换监 copy 镜头.
电路 principle 见图 2.电路 manner core Shi one 块视 频切 换电 path MAX454 (见图 3).它具 Yes mass satisfactory manner exports 图像 sum 很低 basis Aikurai loss true Features of.电路 internal inclusion 4 path 视频 importers (IN0 ~ IN3) Kazuichi 个低 importers 阻抗 manner 线路 Hodai, 驱动 device, 两个 locations ruins importers (A0, A1), one 个视 频输 Dewa 两个 Power terminal.监控 镜头 communication over - J1-J4 Azukaki exchanger 视频 import terminal phase 联. 75Ω 电阻 构成 import manner Termination 电阻. Internal release Taiki manner 增益 Yukarise' standing IC1 manner 13 feet manner anti 馈网 络设 location. Anti-馈网 络由 R5-R8 sum C3 构成.其增 gains 设置 currency and 2 Shi 为了 Compensation standing Termination 电阻 R9 (75Ω) on exhaustion. Top after standing Export end J5 specific 增益 currency and 1.
图 3
IC2 (CD4017, ten 进制 记数, distributor) COMPOSITION 视频 switching 换电 path. This organic 时钟 脉冲 从 14 leg import o'clock, Q0 ~ Q4 Association Yi next exports high 电平 (见图 3). D1 ~ D4 sum IC2 manner three 个输 Extension end (2,4 sum 7 leg) 构成 ten optimal two 进制 转换 电路, currency and IC1 provide land ruins 码. The same time T1 ~ T4 minutes 别与 IC2 manner 3,2,4 sum 7 Ashisho联, 驱动 LED1 ~ LED4 installment 为镜 头切 substitution indication. R15 为发 light two 极管 specific current limiting 电阻.监控 镜头 quantitative 设置 reason DIP 开关 S1 decision.如: 如果 only Yes 两监 refrain 镜头 given the switching exchanger phase 联, S1-a 应接 communication, IC 2 manner fourth exported end given 复位 end 此时 (15 leg) the short contact. Those IC2 记数 gotten Q4 (10 legs) Export end time, 此高 电平 communication over - S1-a using IC2 复位, using switching exchanger heavy new round arrives first 个监 copy 镜头.这样 电路 Board standing 镜头 1 sum 镜头 2 Noriyuki 间循 环. The physical, contact through S1-b some S1-c Yes 以实 Present 3 one 4 个镜 头的 switchtable.
IC3 (LMC555) 构成 时钟 脉冲 发生 unit, currency and IC2 provide 记数 脉冲 signal.调节 R12 Export 频率 currency and 1 arrival 1 / 20Hz. S2 为单 sword three 掷开 Kanto. Striking Arasi 动位 置时, IC3 manner tripod exported manner 记数 脉冲 communication over - S2 进入 IC2 manner 时钟 脉冲 importers end (14 leg) using 电路 own 动记 number, circulation switchtable. Those S2 strokes toward the hand 动位 置时 (S2 为带 弹簧 复位 manner 开关), Power 电压 communication over - S2 给 IC2 one 个记 number 脉冲, 实现 hand 动切 换每 个镜 头. Those S2 Enclosed 间位 置时, IC 2 basis 记数 importers end the R13 置为 low 电平, 记数 device not work.
Power part reason T1, IC4, IC5 sum D5, D6 及 C6 ~ C9 构成 ± 5 Fushimi power supply.
Why 于电 road for 于处 physical high 频的 视频 signal, we 们在 production 时应 attention necessities main recruitment for printing 电路 plate, 如果 您 self design 线路 plate, 请特 separately attention standing signal terminals week 围需 for ground copper - foil protection, 以免 pulling-噪声 Kazukushi扰. Zaiyasu Somoto device matter o'clock, Ken 议先 焊装 电阻 Kazuji 极管, reviews the front manner zero for Shikakisaki 剪下 come basis 引线 for 做两 root 跳线. This later Shi S1 sum IC 2, IC3 manner 插座, Tadashize IC1 unnecessary use 插座. Zaiyasu instrumentation J1 ~ J5 o'clock, 如果 for success rate 稍大 point basis 电烙 铁效 Hatekai Sarayoshimi. Standing 这之 Kisakize Q1 ~ Q4 及电 Yowa LED1. Saikisakisho IC1 directly 焊接 standing 电路 board, 并尽 possible 缩短 Se'ashi 引线 以有 interest 于信 No. 传输.另外, given MAX452 Isaono 类似 specifically assembled 块还 Yes MAX453 (两路), MAX455 (Hachiro), and the like, 其更 multi-资料 Allowed directly visit MAXIM Ltd. 网站 (www.maxim-ic.com), standing 检索 栏内 import MAX454 already Yes 获得 ownership phase 关资 fee, 并可 monkey 请免 费样 goods 做实 验.
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