HY8010, HY8020 circuit typical working principle circuit diagram Voice compression circuit composed of MC1590 etc. Portable megaphone circuit diagram Bus door closing automatic annunciator (555, KD153, KD28) circuit diagram TA7668 is a representative recording and playback dual-channel preamplifier integrated circuit. This IC is widely used in audio systems such as walkman recorders, radio recorders, and combination audio systems
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