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按本刊上期所介绍的电路来看,一般已能满足业余爱好者的需要,但在实际使用中总感到尚不够理想,因此这里作进一步的改进介绍.一、同步电路1.行同步:从上期介绍电路来看,行同步信号取自第一级视频放大器的板极,经二极管分离限幅至行扫描电路,实际上二极管仅起着限幅耦合作用,没有将同步信号分离出来,因而图象信号和消隐脉冲渗入了同步通道,形成了行同步的不够稳实.
According to the circuit described in this issue of view, the general has been able to meet the needs of amateurs, but in actual use of the total felt not yet ideal, so here for further improvement introduced I. Synchronous 1. Line synchronization: from The introduction of the circuit point of view, the line synchronization signal from the first stage video amplifier board, the limit by the diode to the line scan circuit, in fact, the diode only plays a limiting coupling, there is no separation of the synchronization signal, and thus Like signal and blanking pulse into the synchronous channel, forming a line of synchronization is not stable enough.