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晶振是彩电、录象机等专用电路的振荡元件,如损坏或检修时万用表难以测出其好坏。笔者提供一种电路简单且价格低廉的晶振检验器。它只需2只三极管和几只阻容元件,就可以方便地检验出0.4～40MHz范围内晶振的好坏。电路见附图。该检验器由BG1、R1、R2、C1、C2及被测晶振组成了米勒晶体振荡电路,由BG2、D1、D2、LED组成了信号倍压检波及显示电路。当被测晶振良好时,振荡器起振,其振荡信号由C3经D1、D2倍压检波后推动BG2
Crystal is a color TV, video recorders and other special circuit oscillator components, such as damaged or overhaul multimeter difficult to measure its good or bad. I provide a simple circuit and low cost crystal detector. It only needs two transistors and a few RC components, it can easily test the crystal oscillator in the range of 0.4 ~ 40MHz. Circuit see the photo. The tester consists of BG1, R1, R2, C1, C2 and the measured crystal composed of the Miller crystal oscillator circuit, composed of BG2, D1, D2, LED signal doubling detection and display circuit. When the measured crystal good, the oscillator start-up, the oscillation signal from the C3 by D1, D2 times the pressure detection and promote BG2