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本文介绍笔者设计并制作的自动静噪磁头放大电路。该放大器在没有信号输入时或磁带乐曲间处能自动静噪,避免输出噪声。具有线路简单、元件普通、成本低、静噪效果明显等优点。经半年多使用效果良好。TA7668BP是一块性价比高、功能较全的磁头前置放大IC。本电路巧妙的应用该IC内部静噪三极管与CMOS六非门TC4069构成静噪控制电路。详细电路见附图。原理非常简单,信号经TA7668BP及其外围元件均衡放大后由第④、(13)脚输出,一路经R_7、R_8与静噪管并联输出至后级;另一路经R_9、R_(10)混合进入IC2的F_4、F_5、F_6进行放大。F_1、F_2、F_3
This article describes the author designed and produced by the automatic mute head amplifier. The amplifier automatically mutes noise when no signal is being input or between tapes to avoid output noise. With a simple circuit, components common, low cost, quiet effect and so on. After more than six months the use of good results. TA7668BP is a cost-effective, full-featured head preamplifier IC. The circuit clever application of the IC internal noise transistor and CMOS non-TC4069 TC4069 noise control circuit. Detailed circuit see photo. The principle is very simple, the signal by the TA7668BP and its external components balanced amplified by the first ④, (13) pin output, all the way through the R_7, R_8 and mute tube parallel output to the next level; the other by R_9, R_ (10) IC2 F_4, F_5, F_6 to enlarge. F_1, F_2, F_3