Music loop color changing light circuit
Source: InternetPublisher:aytwartoofyoroo Keywords: BSP voltage controlled oscillator voice control Updated: 2021/07/15
Circuit working principle: 220 V AC mains power provides a stable DC working voltage of about 12 V for the control circuit after C1 voltage reduction and current limiting, ZD voltage stabilization, VD half-wave rectification and C2 filtering
. The microphone MIC and VT1 form a voice control circuit, and its output signal is sent to the voltage-controlled oscillator circuit
composed of VT2, VT3, etc. , causing the VT2 collector current to
change , and the C5 charging time to change accordingly, thereby achieving the pulse frequency output by VT1 The purpose is to follow
the rhythm and intensity changes of the music.
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