Traditional Chinese Electronic pulse tester: Circuit Design, Parts List & Workshop Prototype Guide

Premium 3,686 credits (=$36.86) · Priced by article length · permanent access after unlock · 1 $ = 100 credits

Electronic pulse testerThe electronic pulse tester can measure the number of pulse beats per minute and display it intuitively, making it easy to use. When not in use, S disconnects the power supply, and the entire circuit consumes no power when it is static. A 6V laminated battery can be used for a long time.How it works:Figure 17-1 is the block diagram; Figure 17-2 is the electrical schematic diagram.Sensors made of piezoelectric ceramics convert pulse signals into electrical signals. Since this signal is very weak, a linear amplifier composed of NAND gate F1 is used for amplification. The amplified signal is then shaped by NAND gate F2, and then sent to the addition counting input end of IC2 (CD40110) for counting. Whether CI2 and IC3 can count is determined by their locking terminals: when the locking terminal is low level, counting pulse input is allowed; when the locking terminal is high level, the counter is locked and cannot count. IC4 (5G7555) forms a timing circuit, and its output terminal is locked with IC2 and IC3. Normally, pin ③ of 5G7555 outputs a high level, and IC2 and IC3 are prohibited from counting. When SI is pressed, the output of pin 3 becomes low level, and the capacitor C2 is charged through R2. The timing starts, and IC2 and IC3 allow counting pulses to enter. After 60 seconds, the IC4 timing ends, the output terminal flips to high level, the counter stops counting, and the LED digital tube displays the number of pulse beats in 1 minute. C4 and R3 form a clearing circuit, which resets IC2 and IC3 to zero at the moment S is turned on. alt="24.jpg (19583 bytes)">Figure 17-1Component selection and productionIC1 uses CD4011 or TC4011BP; IC2 and IC3 use counting, decoding and driving three-in-one circuit CD40110; IC4 uses 5G7555; the display uses a common cathode two-digit digital tube; the sensor uses HTD-27, which is connected to F1 with a shielded wire; the core wire is welded to the ceramic surface, and the shielding outer skin is welded to the copper sheet. …

Sign in to unlock

Login / Register

One-time payment per article, billed in credits (1 $ = 100 credits). You will review the invoice and the non-refundable digital-asset policy before anything is charged. The PDF is generated on demand and embeds a licensing watermark.