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YS-608 Learning headset principle and maintenance circuit

2015-01-04 00:13  
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YS-608 Learning headset principle and maintenance circuit
The headset circuit entirely composedof division components. When single pole double throw switch K is dialled to 1 position, the headset is at the state ofreceiving infrared, thereceiver tube will receive infrared speech signal from 100 parallel infrared emitting tubes which are in the back of the classroom. This signal is coupledfrom the capacitor C1 to Q1 to amplify, then the voice signal issent to the two level percentile amplifier circuit which is composedof Q2, Q3, and promote left/right two parallel headsets togive off sound.