retropie console

Last update: Sat Jan 10 23:04:54 2026

This is my attempt to build a Retropie console. The """original""" point here is the sound: I'm using a HT28V739 and made a nice box that should double as a nice speaker (hopefully).

Presentation

Principle

Just a retropie console, running on a Raspi 2 and with an opamp to drive a speaker, and cram everything in a wooden box that doubles up as a speaker enclosure.

But hey, why don't you use the GPIO pins in PWM mode instead of the audio jack?

Good question. 2 reasons:

Don't want to change the Retropie config too much and just plugging the cable works fine. I'm lazy if you want.

The PWM signal from the GPIO will not be 0v centered, basically we'd get the "upper" part of the wave only, so sound as is should be bad. (this is just my guess and I did not do any work to check, maybe 5 min of google would prove me wrong but I'm lazy right?)

Implementation

Bill of materials

Raspberry pi 2

HT28V739 op amp

Speaker 8ohm

Schematics

Raspberry pi pinout:

Official https://www.raspberrypi.org/documentation/usage/gpio/

Sorry but clearer than official https://pinout.xyz/#

Pinout from the OFFICIAL site - link above

Source code

Pictures

Links

Helpful sources

Inspiration

All content on this site is shared under the MIT licence (do what u want, don't sue me, hat tip appreciated)
electrogeek.tokyo ~ Formerly known as Kalshagar.wikispaces.com and electrogeek.cc (AlanFromJapan [2009 - 2026])