Alarm & Voice
Metronome using 555 timer
A metronome is a simple circuit produces audible click sound at a regular interval. Trimmer potentiometer provided to set the BPM, typically in beats per minute (BPM). Musicians use the device to practice playing to a regular pulse.
480 Seconds Voice Record/Playback Circuit with PCB Layout Using ISD17240 IC
Project has been designed for record & playback multi voice massages applications using nuvton ISD17240 IC. The module can store up to 480 seconds of voice massage Messages are stored in flash memories made in unique Multilevel Storage Technology (MLS). Circuit provides high quality audio recording and simple operations. Circuit operates in dual mode standalone or micro-controller SPI mode. Onboard tactile switches for standalone mode and 10 (2×5) pin box header connector for SPI mode. 160-480 Seconds voice massage recording capacity.
A project has been designed around Holteks HT8970 voice echo IC. Project can be used in various audio systems karaoke, toys, Animatronics, shows, displays, exhibitions, and sound equipment’s. The HT8970 is an echo/surround effect processor.
Tiny Metronome Using 555 Timer and Buzzer
A metronome is a device that produces an audible click sound at a regular interval that can be set by the Trimmer Potentiometer , typically in beats per minute (BPM). Musicians use the device to practice playing to a regular pulse.
Multiple-Message Record/Playback Module Using ISD1932/ISD1964
This Module has been designed around Nuvoton’s ISD1932 ChipCorder® is the newest single-chip multiple-message record/playback series with dual operating modes (address trigger and direct trigger) and wider operating voltage ranging from 2.4V to 5.5V. The sampling frequency can be selected from 4 to 12 kHz via an external resistor, which also determines the duration from 10.6 to 32 seconds. These ICs are designed mostly for standalone applications, and of course, it can be used in conjunction with a microcontroller, if necessary.
32 Seconds Voice Record/Playback Module
Project has been designed around Win bond’s ISD1616 IC (SMD) IC, which is fully integrated, single-chip, single massage voice record and playback device ideally project suited to a variety of electronics systems. Massages are stored in flash memories made in unique Multilevel Storage Technology (MLS). Therefore, voice or audio data are stored directly into the memory in their natural form without any compressions alike digital approach, providing high-quality, solid-state audio reproduction. Project provides high quality audio recording and simple operations. Massage duration is user selectable in ranges from 10 to 20 Seconds depending on the sampling rates from 4 KHz to 12 KHz adjustable via on board potentiometer (preset), giving the users greater flexibility in duration versus recording quality.
Water Level Sensor Alarm
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water.
Light Sensitive Audio Oscillator
Light Sensitive Audio Oscillator project is a fun loving project which will create different sound effects depending on the light falling on the sensor (LDR)
2 Tone Audio Oscillator Circuit
2 Tone Audio Oscillator is a simple circuit which will generate audio tone on the press of a button. This circuit can be very useful as test equipment for audio equipment or as a signal source in an audio input.
3 tone audio oscillator
3 Tone Audio Oscillator Circuit : 3 Tone Audio Oscillator is a simple circuit which will generate audio tone on the press of a button. This circuit can be very useful as a test equipment for audio equipment’s or as a signal source for an audio input.
Audio Oscillator Generator Adjustable 115Hz-1Khz
Audio Oscillator project simply produces audio tones for use in the range of 115 Hz to 1 KHz. This kit is a must for audio technicians and experimenters alike.
Piezo Disc/Piezo Diaphragms Driver Circuit
Piezoelectric Diaphragms are piezoelectric ceramic disks adhered to a metal plates of brass or nickel-alloy. Diaphragms can be classified into External Drive Type and Self Drive Type.
3 TONE SIREN USING UM3561
Tone Generator is a simple project which generates an Oscillating Frequency to
drive a PIEZO disc to produce tones.
Sound to Light Effects using 5 LEDS and LB1403/CA1403 IC
Moisture Sensitive Alarm Circuit Using BC547 Transistor and PCB Based Sensor