门禁电话通话电路图
门禁电话通话电路图
in this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. the bc109c stage amplifies in common base mode, giving good voltage gain , whilst providing a low impedance input to match the speaker. self dc bias is used allowing for variations in transistor current gain. an lm386 is used in non-inverting mode as a power amplifier to boost voltage gain and drive the 8 ohm speaker. the 10k potentiometer acts as the volume control, and overall gain may be adjusted using the 5k preset. the double pole double throw switch, reverses the loudspeaker positions, so that one is used to talk and the other to listen. manually operating the switch (from inside the house) allows two way communication.
智能环境检测面板为实现智能家居提供巨大助力
电气传动优缺点 电气传动方式有哪些
美国四大科技巨头排名 微软夺榜苹果垫底
传感器技术的下一步
iPhone15或使用台积电3nm芯片
门禁电话通话电路图
网络变压器检测：LCR测量仪检测元器件原理与使用方法(1)
极米科技和倍轻松PLM项目开始上线启动
人工智能呈上升趋势，主要针对这16项新技术
森兰高压变频器在盾安莱阳供热项目的应用
国产BMS计量芯片突围消费市场，国内外BMS计量芯片对比
OMDIA：美国芯片企业渴望在中国开展业务
时序分析基本概念介绍<Critical Path>
TYAN最新展示性能领先的嵌入式主板
AIoT技术正在成为构建新型能源体系的重要支撑
雷击计数器综合选型应用方案
四种消弧线圈的工作原理
简单介绍华为xMotion智能车身协同控制系统
基于PLC的油田联合站远程监控解决方案
大数据时代，医疗行业何去何从？
in this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. the bc109c stage amplifies in common base mode, giving good voltage gain , whilst providing a low impedance input to match the speaker. self dc bias is used allowing for variations in transistor current gain. an lm386 is used in non-inverting mode as a power amplifier to boost voltage gain and drive the 8 ohm speaker. the 10k potentiometer acts as the volume control, and overall gain may be adjusted using the 5k preset. the double pole double throw switch, reverses the loudspeaker positions, so that one is used to talk and the other to listen. manually operating the switch (from inside the house) allows two way communication.
智能环境检测面板为实现智能家居提供巨大助力
电气传动优缺点 电气传动方式有哪些
美国四大科技巨头排名 微软夺榜苹果垫底
传感器技术的下一步
iPhone15或使用台积电3nm芯片
门禁电话通话电路图
网络变压器检测：LCR测量仪检测元器件原理与使用方法(1)
极米科技和倍轻松PLM项目开始上线启动
人工智能呈上升趋势，主要针对这16项新技术
森兰高压变频器在盾安莱阳供热项目的应用
国产BMS计量芯片突围消费市场，国内外BMS计量芯片对比
OMDIA：美国芯片企业渴望在中国开展业务
时序分析基本概念介绍<Critical Path>
TYAN最新展示性能领先的嵌入式主板
AIoT技术正在成为构建新型能源体系的重要支撑
雷击计数器综合选型应用方案
四种消弧线圈的工作原理
简单介绍华为xMotion智能车身协同控制系统
基于PLC的油田联合站远程监控解决方案
大数据时代，医疗行业何去何从？