3 Channel Digital Subwoofer Amplifier Board The 3 channel digital subwoofer amplifier board runs on two high-quality TPA3116D2 digital amplifier chips. It is powered at a DC supply voltage of 12-24V. The subwoofer amplifier board has very sound quality with great amplifying power. This amplifier board has 3 channels out of which there are two 50W channels and one 100W channel that works with high efficiency and produces low heat. Users can simply connect the power supply and loudspeaker box in order to enjoy pure digital music.   Disclaimer: Please note that this 3-Channel Digital Subwoofer Amplifier Board uses a clone IC designed to offer similar functionality to TPA3116D2 digital amplifier chips. This product has been tested to ensure comparable performance and quality for compatible applications. Key

5V DC Mini Class D Pam8403 USB Power Amplifier Board The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. The PAM8403 audio amplifier can extend the battery life, which makes it well-suited for portable applications. The board uses the typical circuit design of PAM8403, using MICRO USB power supply (reserved wire power interface), it is easy to use a universal mobile phone charger for its power supply, resistance devices are standardized patch technology, simple and stable. Applications: LCD Monitors / TV Projectors Notebook Computers Portable Speakers Portable DVD Players, Game Machines Cellular Phones/Speaker Phones Also check the PAM8610 Digital Amplifier Board available on Iotcart. It is a 15W per channel stereo Class-D audio amplifier with DC Volume Control. The working mode is Class D (PWM modulation type), and it features a switch function that, when shorted, will close the amplifier. Package Includes: 1 x Pam8403 USB Power Amplifier Board Specifications: Supply Voltage  6.0 V Input Voltage -0.3 to VDD +0.3V Operation Temperature Range -40 to +85 Maximum Junction Temperature  150 Dimension 21x21x2mm Weight 2g

8 Ohm 0.5W Speaker An 8 ohm 0.5 watt speaker is an electronic component that converts electrical signals into sound waves. It is typically used in small electronic devices, such as cell phones, portable speakers, and handheld radios, where space is limited and low power consumption is important. The resistance of a speaker, measured in ohms, determines its electrical characteristics and how it interacts with the amplifier or other electronic devices it is connected to. An 8 ohm speaker has a resistance of 8 ohms, which is a moderate impedance level that is suitable for use with a wide range of amplifiers. The power rating of a speaker, measured in watts, determines the maximum amount of power that the speaker can handle without being damaged. A 0.5 watt speaker has a relatively low power rating, which means that it is suitable for use with low-power amplifiers or in applications where high volume is not required. Speakers are used in a wide variety of electronic devices, including cell phones, portable speakers, handheld radios, home theater systems, and computer speakers. They are essential components of these devices, as they allow the user to hear the audio output of the device. Package Includes: 1 x 8 Ohm 0.5W Speaker Specifications: Resistance  8 Ohm Radius  3.3cms  Height  2.5cms  Weight  80grams Output power 0.5 W

Condenser Microphone These condenser microphones are widely used in electronic circuits to detect minor sounds or air vibrations which in turn are converted to electrical signals for further use. This condenser microphone has  two legs which are used to make electrical connection with the circuit. The two plates of the capacitor, which is the heart of the microphone, The diaphragm (inside the metal body) is a very thin film of conducting metal. It is deformable and elastic in nature. The diaphragm is pasted on a solid hollow ring which provides the necessary support to the diaphragm. The back plate is a thick solid perforated metallic plate. It is coated with a permanently charged electret material to eliminate the need of polarized power supply. These electrets are made by melting a dielectric material (like wax, plastic, etc) that contains polar molecules and solidifying them back in a strong electrostatic field. The polar molecules of the dielectric material are inclined towards the direction of the electrostatic field and create a permanent electrostatic bias in them. In the modern microphones, PTFE (Poly Tetra Fluoro Ethylene) plastic is used to form the electric material. The design of the holes plays a very vital role in reducing the air damping and mechanical thermal noise. The two plates have a small gap between them to allow the movements of diaphragm. A very fine thin film of plastic is placed between the two plates to provide electrical insulation. The diaphragm moves in the air gap between the plates with the slightest disturbance caused in the surrounding air pressure by the sound signal. If you want to use this condenser microphone in your project, for that you will need few essential components like batteries or power supply, IC, resistors and capacitors.

DTMF Decoder - GL Decodes DTMF audio signal to 4 bit binary TTL level output with LED indication. It also indicates outputs with LED. Can be used directly with microcontrollers to develop various DTMF related applications like remote monitoring, remote control, Caller ID, Auto Dialer, Remote Triggering etc. read more : DTMF DECODER: MADE IN INDIA Applications: Remote Control systems. Caller ID applications. FM receiver-based remote control. Remote control using a Mobile phone. Package includes: 1 x DTMF Decoder - GL Specifications: Operating Voltage 5/12V (DC/AC) Operating Current 100 mA. Weight 10g

ISD1820 3-5V Voice Module Recording And Playback Module with Microphone and 0.5W Speaker The ISD1820 Recording Module Voice Board is the real easy way to add Voice Recording (and Playback) to your project. The Module can be operated directly by using the 3 Push-Buttons or with every microcontroller (ex. Arduino). A microphone is implemented directly on the board, and you can connect any 8 Ohm Speaker. Your recordings are saved even without power due to the non-volatile storage on the ISD1820. This module uses the ISD1820 voice record and playback IC to record a single voice message of up to 10 seconds in length. The recorded message is stored in its specialized analogue flash memory that will keep the message stored even when power is removed. The module includes an electret microphone to record your message and push buttons allow for record, partial playback, or full playback of the message. Header pins allow for easy interface to a microcontroller and playback can be controlled with just one digital pin. Key control recording and playback operation method: REC key: recording button, press and hold to record, release the button to stop recording; RLAYE key: trigger mode playback, click to play the current voice of the entire paragraph; PLAYL key: jog mode playback, press and hold to playback, release to stop playing; RPL jumper: loop play mode control, can be played circularly; FT jumper: through control, it allows the microphone voice directly to the speaker to playback. Method of operation: REC button: record button, you can press and hold the recording, release the button to stop recording; RLAYE key: trigger mode playback, press will play this whole speech; PLAYL key: jog mode playback, press and hold until playback, release to stop playback; RPL Jumper: loop mode control, loop playback; FT Jumper: direct control, microphone voice through the speaker can playback. Also check the ISD1820 Sound Voice Board Recording Module. It features the ISD1820 chip with an onboard microphone, allowing direct recording of approximately 10 seconds of voice. This recording/playback device offers true single-chip voice recording, non-volatile storage, and playback capabilities for 8 to 20 seconds. Package Includes: 1 x ISD1820 3-5V Voice Module Recording 1 x Playback Module with Microphone 1 x 0.5W Speaker Specifications: Chip ISD1820 Operating Voltage (VDC) 3V-5V. Loudspeaker 8 ohm, 0.5W Dimensions (LxWxH) 80 x 60 x 30 in mm

ISD1820 Sound Voice Board Recording Module The ISD1820 Sound/Voice Board Recording is 100% Brand new and high-quality Board ISD1820 chip with an Onboard microphone, you can direct recording of About 10 seconds voice recording. This voice record/playback device is based on the ISD1820 chip, which can record/playback multiple-message. It can offer true single-chip voice recording, non-volatile storage, and playback capability for 8 to 20 seconds. For the sampling rate of 3.2KHz, it can record for the total duration of 20 seconds. Package Includes: 1 x ISD1820 Sound Voice Board Recording Module Specifications: IC Chip ISD1820 Operating Voltage (VDC) 3 ~ 5 Dimensions 5.5 x 3.8cms  Weight  5 grams

NE555 Multi-Channel Waveform Generator Module NE555 multi-channel waveform generator can generate a square wave, sawtooth wave, triangle wave, sine wave. A waveform output is selected by a jumper, and the circuit is simple and convenient to operate. Package Includes: 1 x NE555 Multi-Channel Waveform Generator Module Specifications: Input dc6~12v Module Type  NE555 multi-channel Dimensions  51X 44x 5mm Weight  5 grams

PAM 8403 Amplifier Module with Knob PAM8403 is a basic 5V input amplifier board that can drive two 3W + 3W stereo speakers. It’s a great option for anyone looking for a Class-D stereo audio amplifier with a tiny footprint. The user can get high-quality audio reproduction from a stereo input using this amplifier. It also has a unique function in that it can drive speakers directly from the output. . It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filter-less architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. It can extend the battery life, which makes it well-suited for portable applications.  This PAM8403 Amplifier module differs from the conventional PAM8403 Amplifier board in this module it allows us to have more control over the output provided by the IC. By control, we mean that this amplifier module board comes with a knob that allows you to adjust the output. The PAM8403 IC provides high-definition sound quality and highlights the benefits of digital chips. The circuit uses the most reasonable peripheral arrangement, and the power supply filter is increased to 470uf. read more : Types of Amplifiers with their Workings Note:  Please make sure the power supply is not more than 5.5V and please don't do reverse polarity for "+" and "-", or else, it will burn the board. Applications: Bluetooth Stereo Audio hands free / headsets In robots that speak or generate sounds to indicate activities Portable Speakers  LCD Monitors / TV Projectors Arduino or Raspberry Pi Game Machines Speaker Phones Package Includes : 1 x PAM8403 Mini 5V Digital Amplifier Module with Knob Specifications: Model  GF1002 Input voltage 2.5--5.5V Output 3W*2 Power filter 470uF Size 29.5 x 20.2 x 15mm (not including the extended bar)

PAM8403 Digital Power Amplifier The PAM8403 5V Two-channel Stereo is a 3W+3W, class-D audio amplifier, allowing it to achieve high-quality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area. You can power the pam8403 amplifier board 5v using your mobile charger or can be by a computer USB plug. You can use two speakers 3/5 watts on both sides L and R. And connect the Audio cord to the LTR portion.  With the same number of external components, the efficiency of the PAM 8403 is much better than that of its Class-AB cousins. It can extend the battery life, which makes it well-suited for portable applications.  Note: Input audio should be via shielded wire for best performance. Use a proper filtered power supply with good filter capacitors. Take care not to short speaker wires else IC will get damaged. Make sure power supply never exceeds 5.5V else IC will get damaged. Use a regulated power supply. Applications: LCD Monitors / TV Projectors  Notebook Computers Portable Speakers  Portable DVD Players, Game Machines  Cellular Phones/Speaker Phones Also check the 5V DC Mini Class D Pam8403 USB Power Amplifier Board available on Iotcart. It is a 3W, class-D audio amplifier with low Total Harmonic Distortion plus Noise (THD+N), enabling high-quality sound reproduction. The filterless architecture allows it to drive the speaker directly, eliminating the need for low-pass output filters and reducing system cost and PCB area. The amplifier operates on a 5V power supply and is designed for Bluetooth audio receiver module dedicated interfaces. Package Includes: 1 x PAM8403 Digital Power Amplifier Specifications: Model  PAM8403 Operating Voltage (VDC) 2.5 ~ 5.5V Current Handling Capacity (A) 0.08 Load Can direct drive 4 or 8-ohm small speakers. Dimensions  21 x 18 x 3(mm) Weight  5 grams