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CN104638600A
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Power-off protection circuit for projectors
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CN104638607A
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Protection circuit for sound box loudspeaker
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CN104617917A
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Multi-waveform generator for teaching
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CN104617606A
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Charging and discharging circuits for solar laser pen
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CN104616479A
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Binary channel infrared control emitter used for controlling projector
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CN104617964A
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Frequency modulation transmitter for use in English teaching
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CN104618050A
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Broadcasting circuit for campus frequency modulation broadcasting
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CN104617941A
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Dead zone control circuit for class-D audio power amplifier
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CN104602165A
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Loudspeaker amplifier protection circuit used for teaching
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CN104617891A
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Speech preamplifier circuit used for teaching microphone
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CN104602152A
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Simple wireless microphone for teaching
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CN104602161A
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High-voice-definition microphone for use in teaching
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CN104599413A
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Simple four-person responder circuit for teaching
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