Tag Archives: audio

App note: BH45F0031 Earphone jack communication

via Dangerous Prototypes

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Holtek’s App note about their audio to digital signal converter chip BH45F0031 that together with an phone app, communication via audio phone jack is possible. Link here (PDF)

The BH45F0031 is a Flash type 8-bit high performance RISC architecture microcontroller, which is designed for smart phone headset interface applications that can directly transmit data and communicate with the microcontroller using their audio earphone interface.

The BH45F0031 can convert the analog audio signals from mobile phones into digital data and transmit them to a master external MCU. The device can also convert the digital data from the master MCU into analog audio signals and transmit them to mobile phones.

100W AF dummy load

via Dangerous Prototypes

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Dilshan Jayakody has published a new build:

This is a quick post to showcase 100W 4 channel AF dummy load which we build to test the output stages of audio power amplifiers. This dummy load use 4, 8Ω 100W wire wound resistors which are available in eBay. In this unit all 4 resistors are mounted on 170mm × 40mm × 60mm high gauge aluminum heat sink.

Project info at Dilshan Jayakody’s blog.

Smart Watch Hack Lets You Use Your 3.5mm Headphones With An iPhone 7

via hardware – Hackaday

As you may have heard, the iPhone 7 is ditching the 3.5 mm headphone jack in the name of progress and courage. Whatever your take on that, it leaves the end user out in the cold if — for instance — their preferred headphones still use the old format. Here to save you from an untimely upgrade is YouTuber [Kedar Nimbalkar], who has modified a Bluetooth Smartwatch to incorporate a 3.5 mm jack to allow continued use your current headphones.

After opening up the smartwatch [Nimbalkar] removes the speaker, solders in a 3.5 mm headphone jack and clips out an opening in the watch’s case that maintains the watch’s sleek exterior.

This mod is a bit of a catch-22 — losing out on hearing any notifications from your phone unless your headphones are plugged in and in your ears, and you only get mono audio output using this method; some tinkering with the software might alleviate this issue. However practical this may be for you, workarounds like this one remind us that we can still achieve the functionality we want though innovative expertise. Challenge yourself!

If you want some even older-school audio output from your smart watch, 3D print a gramophone docking station.


Filed under: hardware

App note: Measuring a loudspeaker impedance profile using the AD5933

via Dangerous Prototypes

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An application note from Analog Devices about AD5933, this provides a low cost substitute to expensive test equipment like signal generators, oscilloscope and voltmeters in getting the speaker’s impedance profile. Link here (PDF)

This application note describes a circuit architecture using the AD5933 that allows the system designer to measure the impedance profile of the loudspeaker and integrate this circuitry into the audio signal chain. This offers many benefits. Upon system power-up, for example, the circuitry provides the ability to measure the impedance profile and thus the acoustic properties of the loudspeaker, enabling direct comparison to a factory calibrated profile stored nearby. Any changes in the impedance profile are detected and further diagnostics are carried out, preventing premature damage.