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收录机为了获得较好的抹音效果和录音效果,其抹、录音电路大多采用超音频振荡电路。这里介绍两种制作容易、性能较佳的超音频振荡电路,供业余无线电爱好者自制参考。 (1)单管超音频振荡器本振荡器的原理见图1,这是一个电容三点式振荡电路,直接利用交流抹音磁头自身的电感起振,因此具有线路简单的特点。
Tape recorders in order to obtain a better wiping sound effects and recording effects, the wipe, recording circuits are mostly super audio oscillator circuit. Here are two easy to create, better performance of the super audio oscillator circuit, for amateur radio enthusiasts homemade reference. (1) Single-tube super audio oscillator The principle of the oscillator shown in Figure 1, which is a three-capacitor oscillator circuit, the direct use of AC wiping the inductance of its own start-up inductance, it has a simple circuit features.