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.

Musicians practice with metronomes to improve their timing, especially the ability to stick to a tempo. Metronome practice helps internalize a clear sense of timing and tempo. Composers often use a metronome as a standard tempo reference—and may play or sing their work to the metronome to derive beats per minute if they want to indicate that in a composition.

555 Timer IC is a heart of the project, Buzzer used as sound generator, Trimmer Potentiometer provided to set the tempo of sound. circuit works with wide range 5V to 12V and its consumes 30-50mA current. Frequency range adjustable 1Hz to 20Hz. other frequency output possible altering the C3 and PR1.

 

 

 

 

 

About 555 Timer

These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.

The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a low-impedance path is provided between discharge (DISCH) and ground.

The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of 5 V to 15 V. With a 5-V supply, output levels are compatible with TTL inputs.

 

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.

 

The two operating modes are address trigger and direct trigger. While in address trigger mode, both record and playback operations are manipulated according to the start address and end address specified through the start address and end address pins. However, in direct trigger mode, the device can configure the memory up to as many as eight equal messages, pending upon the fixed message configuration settings. With the record or playback feature being pre-selected, each message can be randomly accessed via its message control pin.

The device has a selectable differential microphone input with AGC feature or single-ended analog input, analog in, under feed-through mode. Its differential Class D PWM speaker driver can directly drive a typical speaker or buzzer.

 

Sampling Rate or Recording Time Selection

  • R5: 53.3K 12 KHz sampling frequency 21.3 Seconds Voice Recording
  • R5: 80K    8 KHz sampling frequency 32 Seconds Voice Recording
  • R5: 100K 6.4 KHz sampling frequency 40 Seconds Voice Recording
  • R5: 120K 5.3 KHz sampling frequency 48 Seconds Voice Recording
  • R5: 160   4 KHz sampling frequency 64 Seconds Voice Recording

 

Features

  • Wider operating voltage from 2.4 to 5.5V
  • Higher sampling frequency from 4kHz to 12kHz
  • Voice Recording Time 21 Seconds to 64 Seconds depend on sampling rate selection ( R5-OSC Resistor )
  • FT: converts MIC+ to ANAIN & feeds it to the speakers
  • R/P: record/playback switch
  • REC: level or edge recording
  • PLAYE: edge-trigger, toggle on/off
  • PLAYL: level playback or looping playback
  • LED: LED output for recording
  • LED Blinks for while at end of the message in play mode
  • NORM (Address Trigger) : variable message duration
  • MODE: (Direct Trigger) : fixed message duration

 

 

 

 

 

 

 

 

Example Circuit for Multiple switch connections

 

Sound To Light Effects Using LM358 Op-Amp LEDs & Microphone

Sound to Light Effects Using OP-Amp LED and Microphone (1)

This PROJECTS  will turn your favorite music into light effects, a microphone picks up the sound and gives  light effects with 6 Red LEDs, ideal for creating fun atmosphere at parties & discos. Supply 9V-12V DC.

DOC

Features

  • Supply 9V-12V DC (PP3 9V Battery)
  • On Board Preset for Gain Adjust
  • 6 On Board LEDs
  • On Board Condenser Microphone
  • SMD based small Board
  • PCB Dimension 45.72 X 28.58 MM
  • CN1 Supply Input
  • PR1 Sensitivity Adjust

 

Sound to Light Effects Using OP-Amp LED and Microphone (3)

Sound to Light Effects Using OP-Amp LED and Microphone (2)

Sound to Light Effects Using OP-Amp LED and Microphone (1)

Moisture Sensitive Alarm Circuit Using BC547 Transistor and PCB Based Sensor

MOISTURE SENSITIVE ALARM B

Circuit here is moisture sensor sounds an alarm when water reaches its sensor or moisture level is very high in the air. This project is a simple and a cost effective project for use in home or industrial purpose.

DOC

  •  Power Supply Input – 6 VDC @ 25 mA
  •  Output – Buzzer
  •  Onboard On/Off Switch
  •  Sensor PCB included
  •  Terminal pins for connecting power supply
  •  Four mounting holes of 3.2 mm each
  •  PCB dimensions 63 mm x 42 mm

MOISTURE SENSITIVE ALARM (3)

MOISTURE SENSITIVE ALARM (2)

MOISTURE SENSITIVE ALARM (1)

SOUND TO LIGHT EFFECTS USING LED AND VU METER IC C1403

J009

Audio Dancing LED project is a fun filled project which generates a LED dancing sequence depending on the audio level it senses.  This project is based on one of the VU Meter IC LB1403 or CA1403

DOC

Specifications

Power supply input 6 to 9 VDC
Output 5 LED’s
Onboard preset to adjust audio level to the IC
Onboard microphone capsule with Preamp
Terminal pins for connecting power supply input
Four mounting holes of 3.2 mm each
PCB dimensions 39 mm x 67 mm

 

J009-SCH1 PCB_BOT1 PCB_SILK1

BOM1

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