Dual-purpose voice-activated light switch circuit

It is a two-brush voice-activated light switch circuit made with SK-U voice-activated integrated circuit . It has
two operating modes: delay and steady.
    In the figure, SI and S2 are a linked 2×2 toggle switch, used to select the operating mode of the circuit.
When S1 and S2 are moved to position ① (that is, the claw position), it is a delayed working mode, and its circuit principle is the same as the above example
. At this time , the base of the diode VT that controls the suction stage of the relay
K or the release is connected to the output end of the first -stage inverting amplifier of the voice control integrated circuit , that is, the ⑩ pin. C; is a delay capacitor. Every time you clap your palm, the relay
K can be sucked onto the stage. After a delay, K returns to the release state. The length of the delay time is determined by the C capacity. When
the switches S] and S2 are moved to position ②, the circuit is bistable. At this time, the base of the transistor VT is connected to the current
-drawing output end of the integrated block, which is the ⑥ pin, and the delay capacitor C. Disconnected, C. As the frequency selection capacitor of the circuit. At this
time, the first stage inverting amplifier in the integrated block is not used because the output end is floating. The three inverting amplifiers in the integrated block
only use the second and third stages. The clapping sound wave signal felt by microphone B passes through C and is coupled and sent.
The input terminal of the second inverting amplifier in the integrated circuit , that is, pin ①, is amplified and output by pin ②. Then it is sent to the input end
of the first i-level inverting amplifier through the C: coupling , that is, the @th pin, and then processed by the internal circuit to flip the bistable
flip-flop in the integrated block, forcing the current output end to be pulled in, that is, the @th pin. The pin level flips for the first time, thereby controlling the relay K
to absorb or release. That is, clapping your palm once will cause the relay K to turn on and the light E to light up; touching your palm again will
cause the relay K to release and the light F to go out.