Audio Amplifiers
I am well and truly stumped when it comes to amplifying BMOW’s audio. Any sane person would have given up long ago. Mix the three voices down to two stereo channels, and send them unamplified to headphones, and it sounds…
Year 2009
Custom PCBs
While I wait for my new audio power amp chips to arrive, I’ve started looking at making a custom PCB or two for BMOW’s various buttons, connectors, and jacks. I plan to use a pizza-box case from an old X-terminal…
Mixing and Volume
I’ve done some more breadboard experiments with the audio output circuit, but I’m having a lot of trouble getting it all to work as intended. First the good news: I built the LM386 amplifier section, and it pretty much works.…
Progress on Audio
I’ve made some good progress on the audio hardware, working with the SN76489 and an Arduino microcontroller to help test things out. I put those components plus a clock generator on a breadboard, and wrote some simple Arduino programs to…
Audio Plans
It’s finally time to create an audio system for BMOW. There’s not much board space left, so this will likely be the end of the road as far as new hardware goes, save perhaps one or two miscellaneous chips. I’ve…
Fun With Fonts
The BMOW display circuitry supports bitmap fonts, with each character on an 8×16 pixel grid. When I first built the hardware, I used an 8×16 font from X-Windows, but I never cared for it much. Here’s what it looks like:…
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