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十一、振铃电路(下) 徒弟:上一讲我们着重分析了8204类振铃电路的原理,能对LH1240类振铃电路作一介绍? 师傅:LH1240是单片电子振铃电路,用得也比较广泛。它具有电流消耗低的特点,允许4个器件并行工作。其内部采用带稳压二极管的桥式整流电路。音调和切换频率可以通过外接元件调整,电压和电流的滞后性统一。徒弟:LH1240电路能驱动何种扬声器? 师傅:LH1240电路能够直接驱动压电陶瓷扬声器。如果用该集成电路驱动动圈式扬声器时,需要加一
Eleven, ringing circuit (below) Apprentice: Last talk about our emphasis on the analysis of the 8204 ringing circuit principle, can be an introduction to the LH1240 ringing circuit? Master: LH1240 is a single electronic ringing circuit, used Also more extensive. It features low current consumption, allowing four devices to work in parallel. Its internal bridge rectifier with Zener diode rectifier circuit. Tone and switching frequency can be adjusted by external components, voltage and current hysteresis unity. Apprentice: LH1240 circuit can drive what kind of speaker? Master: LH1240 circuit can directly drive piezoelectric ceramic speakers. If you use the integrated circuit drive dynamic speaker, you need to add one