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本文介绍一款简单易制的抢答器,使用一块通用时基集成电路NE555,从而使电路更为简洁且无需调试。一、工作原理该抢答器电路原理如附图所示。市电经变压器T降压,二极管D1～D4整流,电容C滤波后,得到+10V直流电源电压,接通开关SW,抢答器工作。在此电路中,将时基电路NE555接成施密特触发器的形式,即将其第②脚与第⑥脚相连。该电路处于等待状态时,IC
This article describes a simple and easy to make answerrs, using a common time base integrated circuit NE555, so that the circuit is more concise and without debugging. First, the working principle The answer circuit principle as shown in the attached figure. Mains by the transformer T buck, diode D1 ~ D4 rectifier, capacitor C filter, get +10 V DC supply voltage, switch SW, responder work. In this circuit, the time base circuit NE555 access Schmitt trigger form, that is, the first ② feet and the sixth foot connected. The circuit is in wait state, IC