An ESP32-S3 running DOOM, a Bluetooth controller interface, a battery, and a self-generated RF signal all fit inside a 300-to-75-ohm TV antenna balun plug. Builder RayTriangle crammed two PCBs connected by a flexible board on either side of the battery into a component most people throw in a junk drawer.
The RF output is the technical story worth reading in full. RayTriangle uses a resistor-ladder DAC with precomputed lookup tables for phase-shifted chroma waveforms to generate composite video, then modulates it onto a VHF carrier derived from the ESP32-S3's own clock generator. It is a deliberately retro signal chain, and the full writeup details exactly how the math and timing work.
Current output targets PAL VHF tuners and carries visible noise, but the composite signal quality is already functional enough to play the game. NTSC and UHF adaptation remain open problems. The project sits next to the 2016 world's-smallest MIDI synthesizer as a benchmark for how much you can compress a working system into commodity hardware.
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