General > General Technical Chat

Reverse engineering/reprogramming a cheap novelty audio device

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Halcyon:
See attached.

I was given one of these novelty "buttons" where each press has a different sound effect/phrase, seems like chosen at random. These are just mass produced single-sided boards with various different themes, so I'd imagine there would be a way to reprogram the chip with different audio.

I've buzzed out the pins, which seem to be:

Unknown IC
Pin 1 - Battery positive
Pin 2 - Speaker
Pin 3 - D1 (Unpopulated)
Pin 4 - Switch
Pin 5 - Speaker
Pin 6 - Battery negative
Pin 7 - N/C (?)
Pin 8 - D2 (Unpopulated)

D1
Pin 1 - To IC Pin 3
Pin 2 - To Battery positive

D2
Pin 1 - To IC Pin 8
Pin 2 - To Battery positive

Any ideas where I can start? I do have an EPROM reader/writer, but not sure if the above pinout resembles anything standard?

tom66:
I had always assumed these were based on OTP/eFuse ROMs and are not reprogrammable.  When we were looking at Nuvoton chips for audio the sales rep mentioned they have low cost audio options which omit the flash and are either mask ROM (for very high volume) or OTP (for mid-high volume). 

Example: https://www.nuvoton.com/products/smart-home-audio/audio-speech-controllers/powerspeech-series/n588hp340-otp/

Halcyon:

--- Quote from: tom66 on April 22, 2024, 10:13:26 am ---I had always assumed these were based on OTP/eFuse ROMs and are not reprogrammable.

--- End quote ---

Ahh bugger!

tszaboo:

--- Quote from: Halcyon on April 22, 2024, 10:17:35 am ---
--- Quote from: tom66 on April 22, 2024, 10:13:26 am ---I had always assumed these were based on OTP/eFuse ROMs and are not reprogrammable.

--- End quote ---

Ahh bugger!

--- End quote ---
I've even saw Jingle bells IC, which had 3 pins:
Power
GND
Jingle bells

Halcyon:
Well there goes that idea. Maybe I can rip the guts out of this one and replace it with a programmable module.

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