Traditional Chinese Multifunctional electronic appliances: Circuit Design, Parts List & Workshop Prototype Guide

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Multifunctional electronic appliancesDue to defects in their organs or other functions, it is difficult for disabled people to live and work like normal people in some aspects. For example: Deaf and mute people cannot wake up with an alarm clock because they cannot hear sounds, and can only be woken up by others; blind people often step into mud and water when walking because they do not know the dry and wet conditions of the road, etc. This multifunctional electronic appliance can provide convenience for disabled people and is suitable for disabled people in different situations.Figure 128The circuit is shown in Figure 128. IC is a two-input four-NAND gate CMOS integrated circuit. Its gate 1, gate 2, R6, and C2 form a low-frequency oscillator with an oscillation frequency of 1Hz; gate 3, gate 4, R5, and C1 form an audio oscillator with an oscillation frequency of about 1000Hz. Whether the two oscillators can oscillate is controlled by the level of pin 13 of gate 1. When pin 13 of gate 1 is high level, the two oscillators start to oscillate; when it is low level, they stop oscillating.The working principles of its four functions are briefly described as follows:(1) Sleep wake-up function for deaf-mute peopleThis function should be used in conjunction with the electronic alarm clock. X is the electronic alarm clock contact piece, switch S1 is turned off, S2 is placed at terminal b, and S3 is placed at terminal d. Normally, the contact piece When the wake-up time comes, X closes, so that pin 13 of gate 1 is at a high potential, and the two oscillators start to oscillate. The audio pulse output from pin 4 of gate 4 is amplified by VT and boosted by step-up transformer T. A pulse voltage with a higher voltage and a small current is generated at both ends of electrodes M and N, which is used to stimulate and wake up the deaf-mute.In the circuit, S1, S2, and S3 all use micro toggle switches. The 6V DC power supply uses four AA batteries. IC uses C035, C006, C066 and other CMOS integrated circuits. The step-up transformer T can use a silicon steel sheet from a power transformer of about 2W as the iron core, wind 84 t …

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