Traditional Chinese Practical Six-way answering machine: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Six-way answering machine. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 3934 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Six-way answering machineIt can be seen from Figure 141: This is a simple universal answering machine circuit. It uses MC14599 as the core and is equipped with three CMOS gate circuits.Figure 141Among them, the data terminal D and read/write control terminal W/R of MC14599 are connected to high level through resistor R2. Therefore, the circuit is set to "write-only" mode, that is, data can only be sent from the data terminal to the latch specified by the address. Moreover, since the D terminal is always connected to high level, the data written into the latch can only be high level "1". The reset terminal RST is controlled by the reset button SBR and the reset circuit composed of R1 and C1. When SBR is pressed, the latch is reset; R1 and C1 simultaneously form a power-on automatic reset circuit. Its WD and CE terminals are controlled by the output of the "OR" gate CD4078. Its 3-bit address lines A0, A1, and A2 are controlled by the output of the OR gate CD4075.The three-input OR gate circuit CD4075 and the 1#~6# answering keys SB1~SB6 together form an address encoding circuit. The address codes corresponding to each button are shown in Table 1. …
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