Top 100 Electronic Projects for Innovators: Handbook of Electronic Projects (Electronic Projects Books) by Arsath Natheem S

Author:Arsath Natheem S [Natheem S, Arsath]
Language: eng
Format: azw3, mobi
Published: 2018-05-18T16:00:00+00:00

32. IR-Controlled Water Supply

This circuit can be utilized as a part of homes or little eateries for a water supply unit, for example, Restroom flush or washbasin tap.

33.

Triple-Mode Tone Generator

This is a basic circuit that generates three unique tones. You can utilize it as a call bell, criminal alarm or some other security alarm.

Alternative circuit.

Presently, this is unique tone generator circuit which produces three diverse sorts of sound as per input three distinctive logic levels (i.e. 0&1, 1&0 and 1&1).

Circuit description

This circuit is planned around computerized IC 7400 which is NAND gate. The working of the circuit resembles the working standard of oscillator circuit, where frequency relies on capacitors C1 and C2. The duty cycle of this circuit is half. The yield is given to power amplifier circuit which additionally drive amplifier or earphone. For low frequency estimation of capacitor C1 and C2 must be high and the other way around.

Components

Required Resistors (all ¼-watt, ± 5% Carbon)

R1, R4 = 1.2 KΩ; R2, R3 = 1 KΩ; R5 = 10 KΩ; R6, R7 = 47 KΩ

Required Capacitors

C1 = 100 kpF; C2 = 220 kpF; C3, C4 = 10 kpF

Semiconductors IC1 = 7400 (NAND gate)​

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