5G167, LP167 audio voltage controlled lantern control special integrated circuit

This section introduces a home karaoke lighting renderer made using 5G167 integrated circuit. The circuit
is shown in Figure 2-105.
    In the figure, resistors Rl and R2, diodes VD1, VD2 and capacitor CI form a simple resistive step-down half-wave rectification and voltage stabilizing circuit
, which outputs about 12V DC power for SG167. After power on, the t, 2 and 7 pins of 50167 appear high level in sequence, so
that the thyristors VS1 ~ VS3 are turned on in turn, and the three groups of colored light strings H1, H2 and H3 are lit in sequence. As long as the light strings are
properly arranged in the space, a sense of flow can be created. R4 and C2 are external resistor-capacitor components of the integrated voltage controlled oscillator. Their resistor-capacitor values
​​will determine the starting frequency of the colored lights flow. SB is the forward and reverse control switch. When SB is opened, the colored lights flow in the forward direction,
that is, the light lighting sequence is Hl—H2—H3—HI—…; when the switch SB is closed, the colored lights flow in the reverse direction, that is, the light lighting timing is Hl—
H3— H2~H1-….
    The transistors VTI and VT2 form an audio amplifier. The piezoelectric ceramic chip picks up the indoor sound signal and outputs the corresponding electrical signal.
After being amplified by VTI and VT2, the capacitor C6 is sent to the input terminal 5 of the 5G 167 rectifier amplifier (i.e. the IN terminal). After
rectification and amplification inside the integrated block, the oscillation frequency of the voltage controlled oscillator is controlled, thereby changing
the alternating frequency of the high level output of integrated blocks 1, 2 and 7. The potentiometer RP is used to adjust the sound signal pickup sensitivity of the audio amplifier. Place this controller
near the speaker box of home audio equipment, adjust the potentiometer RP to a suitable position, and the circulation rate of the three groups of colored lights will
change with the rise and fall of the singer's singing, thus rendering the atmosphere and beautifying the environment. role.