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

 

LED Based Strobe Controller with Frequency Control and Display Using PIC16F1825 and CAT4016 IC

Strobe provides regular flashes of light. Usually Strobes are designed using Xenon Tubes, Here is LED based simple solution can be used as strobe for entertainment and events and also as warning signals, Project is based on PIC16F1825 micro-controller with two digit frequency display.CAT4016 IC provided to drive 2 display.

Project provides TTL output signal, frequency 1Hz-25Hz, Tact switches provided to set the frequency.  Use solid state relay , BJT transistor or Mosfet at output to drive LED, choose right load driver as per LED required current.

 

The CAT4016 is a 16 channel constant current driver for LED billboard and other general display applications. LED channel currents are programmed together via an external RSET resistor. Low output voltage operation on the LED channels as low as 0.4 V (for 2 to 100 mA LED current) allows for more power efficient designs.

A high-speed 4-wire serial interface of up to 25 MHz clock frequency controls each individual channel using a shift register and latch configuration. A serial output data pin (SOUT) allows multiple devices to be cascaded and programmed via one serial interface. The device also includes a blanking control pin (BLANK) that can be used to disable all channels independently of the interface.

Thermal shutdown protection is incorporated in the device to disable the LED outputs if the die temperature exceeds a set limit.

Features

  • Supply 4.5 to 5V DC
  • Frequency 1Hz To 25Hz
  • Easy Interface with Relay Board
  • Easy Interface with Solid State Relay
  • On Board Power LED
  • On Board Output LED
  • Onboard Switch to set the frequency
  • 2X7 Segment 0.5 Inch Display

Note: Refer Our DC Solid State Relay Circuit  which can be used to drive LED or any other Load.

Applications

  • Strobe for Entertainment
  • Traffic Signal
  • Warning Signal
  • Ambulance Warning Signals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Magnetic Field Sensor With Linear Output Using AD22151

Magnetic field sensor project using AD22151 IC from Analog Devices, The AD22151 is linear magnetic field transducer. The sensor output is a voltage proportional to a magnetic field applied perpendicularly to the package top surface. The sensor combines integrated bulk Hall cell technology and instrument technology to minimize temperature related drifts associated with silicon Hall cell characteristics.

Features

  • Supply 5V DC @ 25mA
  • Power Led On Board
  • Header connector for supply and output
  • Normal Output 1.800V
  • South side Magnet Output 4.800V
  • North side Magnet Output 0.042V

Applications

  • Throttle Position Sensing
  • Pedal Position Sensing
  • Suspension Position Sensing
  • Valve Position Sensing
  • Absolute Position Sensing
  • Proximity Sensing

 

Download PDF Schematic

Download Document

Download Datasheet AD22151

Video With Bar-Graph Display

 

 

 

 

 

 

 

 

 

 

3.1W Stereo-SE Audio Power Amplifier with DC Volume Control LM4952

The LM4952 is a dual audio power amplifier primarily designed for demanding applications in flat panel monitors and TV’s. It is capable of delivering 3.1 watts per channel to a 4Ω single-ended load with less than 1% THD+N when powered by a 12VDC power supply. Eliminating external feedback resistors, an internal, DC controlled, volume control allows easy and variable gain adjustment. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4952 does not require bootstrap capacitors or snubber circuits. Therefore, it is ideally suited for display applications requiring high power and minimal size. The LM4952 features a low-power consumption active-low shutdown mode. Additionally, the LM4952 features an internal thermal shutdown protection mechanism along with short circuit protection. The LM4952 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions.

Key Specifications

  • Supply 12V DC
  • Quiescent Power Supply Current 18mA (typ)
  • VDD = 12V, RL = 4Ω, 10% THD+N 3.8W (typ)
  • Shutdown current 55μA (typ)
  • Volume Control : 0 To 3.3V DC

Features

  • Pop & click circuitry eliminates noise during turn-on and turn-off transitions
  • Low current, active-low shutdown mode
  • Low quiescent current
  • Stereo 3.8W output, RL = 4Ω
  • DC-Controlled volume control
  • Short circuit protection

Download Data Sheet LM4952

 

Applications

  • Flat Panel Monitors
  • Flat panel TV’s
  • Computer Sound Cards

 

 

 

 

68W High Performance Stereo Audio Amplifier Using LM3886

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.

The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe) protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, under voltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.

The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0µV. It exhibits extremely low THD+N values of 0.03% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

Note : Amplifier Required Large Size Heat sink

Features

  • 68W Cont. Avg. Output Power into 4Ω at VCC = ±28V
  • 38W Cont. Avg. Output Power into 8Ω at VCC = ±28V
  • 50W Cont. Avg. Output Power into 8Ω at VCC = ±35V
  • 135W Instantaneous Peak Output Power Capability
  • Signal-to-Noise Ratio ≥ 92dB
  • An Input Mute Function ( J1 & J2 Jumper)
  • Output Protection from a Short to Ground or to the Supplies via Internal Current Limiting Circuitry
  • Output Over-Voltage Protection against Transients from Inductive Loads
  • Supply Under-Voltage Protection, not Allowing Internal Biasing to Occur when |VEE| + |VCC| ≤ 12V, thus Eliminating Turn-On and Turn-Off Transients
  • Input Slandered Audio Line signal

 

 

 

 

 

 

3W Stereo Audio Amplifier Using TDA7266

Tiny stereo audio amplifier board has been designed around SMD TDA7266D IC from ST. The TDA7266D is a dual bridge amplifier specially designed for Portable Audio, for LCD TV/Monitor, PC Motherboard, and TV applications. This circuit provides high quality audio output of 3W approx.  on each channel with standard audio signal input.  The circuit works with 3.5V to 5V. Due to low supply input this amplifier suitable for small size audio gadgets and portable audio applications like MP3 player, Voice messaging system, Warning signals, Annunciator.

Key Features

  • SUPPLY VOLTAGE RANGE 3.5 to 5V (Maximum supply 5V due to small PCB and   small thermal Area)
  •  OUTPUT POWER 3+3W @THD = 10%, RL = 8Ω, VCC = 3.7V (3W Approx.)
  • SINGLE SUPPLY
  • MINIMUM EXTERNAL COMPONENTS NO SVR CAPACITOR NO BOOTSTRAP NO BOUCHEROT CELLS INTERNALLY FIXED GAIN
  • MUTE FUNCTIONS (Jumper Closer)
  • SHORT CIRCUIT PROTECTION
  • THERMAL OVERLOAD PROTECTION

Download Data Sheet TDA7266

 

 

 

 

 

 

 

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