As shown in the figure, the circuit consists of a step-down circuit, a reference pulse oscillator, an acoustic switch circuit, and an execution circuit. The voltage of Vdd=4.8V from the step-down rectification is used as a voltage source for the timing circuit. IC1 and R1, R2, RP1, C2, etc. constitute an astable multivibrator with an oscillation frequency of f0=1.44/(Rl+2R2+RPl)C2.
About 3-2500 Hz, can be changed by the adjustment of RPl. IC2 is a music integrated block 9300, which uses an external timing pulse control to cancel its internal oscillator, so that the playing time depends only on the applied timing pulse frequency.
PCB Spring Terminal Block Section
PCB Spring Terminal Block
It is a new type of terminal block with spring device, which has been widely used in the world's electrical and electronic engineering industry: lighting, elevator lifting control, instruments, power supply, chemistry and automobile power, etc.
Spring type terminal block
Spring type PCB terminal, the connection mode is divided into cage spring connection and butterfly spring connection, which is fast and convenient for wiring and improves the operation efficiency.
It can be used to connect all types of conductors with cross-section of 0.2mm to 16mm, with spacing of 2.5mm-15.0mm.
PCB Spring Terminal Block
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