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随着电视事业的迅速发展,在许多城市已经能接收十多套电视节目。而目前还有许多用户使用只能预选8套节目的电视机,这给用户带来了不便。本文以日立NP 8 C机芯为例介绍一种增加选台单元的简单方法。电路原理如图所示:将电视机选台部分的8 P自锁按钮开关与选台单元组件的PL连接线断开,新增一块选台单元组件和一只2×16按钮转换开关,将其PL端和P′L′端按图中所示连接,新组件的
With the rapid development of the television industry, it has been able to receive more than a dozen television programs in many cities. There are still many users using pre-selected only 8 sets of television programs, which brought inconvenience to the user. In this paper, Hitachi NP 8 C movement as an example to introduce a simple way to increase the station selection. The principle of the circuit is as follows: Disconnect the 8 P self-locking button switch of the television set selection section from the PL connection line of the channel selection unit and add a new channel selection module and a 2 × 16 button changeover switch Its PL end and P’L ’end are connected as shown in the figure, to the new component