Traditional Chinese Practical Ward Pager (2): Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Ward Pager (2). 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 2019 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Ward pager(2)The circuit principle of a practical ward pager is shown in Figure 171. It is mainly composed of a power supply part, a control part, an audio and indication part. The power supply part can use batteries, dry batteries or AC circuits; the control part is composed of SB1, SB2,...SBn and VD1, VD2,...VDn; the audio circuit is composed of a music integrated circuit IC (CIC2851AE, etc.), a transistor VT1 and a speaker; the ward indication circuit is composed of resistors R1, R2...Rn and light-emitting diodes VD1', VD2',...VDn'. (VD1～VDn use 2CP10, VD1＇～VDn＇ use BT201). When SB1 is pressed, VD is turned on and a positive pulse is generated to trigger the music integrated circuit to emit music. At the same time, the indicator light VD1' glows to indicate the ward number. If SB1 and SB2 are pressed at the same time, VD1' and VD2' will light up at the same time, and the audio circuit will sound. alt="245.jpg (50052 bytes)">Figure 171-1 …
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