Simple PWM Filter PCB Design

Having spent a bit of time attempting (although I'm not sure I'm succeeding yet) to understand how to get a useful filter for my Pico Touch Board Audio, I thought it would be useful to have a simple template PCB that could be used for a range of PWM low-pass filtering options. This is my design. … Continue reading Simple PWM Filter PCB Design →

Waveshare Zero Multi Display PCB – Expander Board

Here are the additional build notes to use my Waveshare Zero Multi Display PCB in "expander" mode to support up to eight displays. Waveshare Zero Multi Display PCB Design Waveshare Zero Multi Display PCB Build Guide Arduino with Multiple Displays – Part 3 https://makertube.net/w/jwddZfiSGyRKKhAuU4Rhas Warning! I strongly recommend using old or second hand equipment for your experiments. I … Continue reading Waveshare Zero Multi Display PCB – Expander Board →

Arduino with Multiple Displays – Part 3

Whilst messing around a little more with my Arduino with Multiple Displays – Part 2, I've optimised the code a little and found out a bit more about these displays! In this part, I'm actually using a PCB that can hold four displays, powered by a Waveshare Zero device. More on that here: Waveshare Zero Multi … Continue reading Arduino with Multiple Displays – Part 3 →

Waveshare Zero Multi Display PCB Build Guide

Here are the build notes for my Waveshare Zero Multi Display PCB. Also see the Waveshare Zero Multi Display PCB – Expander Board. Warning! I strongly recommend using old or second hand equipment for your experiments. I am not responsible for any damage to expensive instruments! If you are new to electronics and microcontrollers, see the Getting … Continue reading Waveshare Zero Multi Display PCB Build Guide →

Waveshare Zero Multi Display PCB Design

Following on from my Arduino with Multiple Displays – Part 2, using a Waveshare Zero type module, I wanted to try even more displays in parallel. I don't know what the performance implications will be, or even if it is possible, but I do know I don't really want to be using jumper wires to try … Continue reading Waveshare Zero Multi Display PCB Design →

Arduino and SP0256A-AL2 – Part 2

After getting the Arduino and SP0256A-AL2 working I wondered if I could repeat the trick from the Arduino and AY-3-8910 and have the Arduino generate the required clock signal for the SP0256A-AL2. This post starts to look at that question. Part 1 - Basic introduction and getting started Part 2 - Arduino programmable clock Part 3 - … Continue reading Arduino and SP0256A-AL2 – Part 2 →

Arduino and SP0256A-AL2

Having had a bit of a play with the SP0256A-AL2 Speech Synthesis chip, this post looks at how to drive it directly from an Arduino. Part 1 - Basic introduction and getting started Part 2 - Arduino programmable clock Part 3 - Using a Raspberry Pi Pico as a programmable clock Part 4 - Using a HC4046 PLL … Continue reading Arduino and SP0256A-AL2 →

SP0256A-AL2 Speech Synthesis

I had one of those moments recently when reading an article online sent me into a bit of a major tangent. The article in question was talking about the SP0256-AL2 speech synthesizer chip. And if you heard a computer talking in the 1980s, then chances are it was probably this chip doing all the hard … Continue reading SP0256A-AL2 Speech Synthesis →

Pico Touch Board Audio

I wanted to go back to my Pico Touch Board PCB Design and see if there was a way to make it more stand-alone. The original design was to make it a MIDI controller, but that isn't the only option. https://makertube.net/w/tADSyrPrUdR1mx7yKRXZTC Warning! I strongly recommend using old or second hand equipment for your experiments. I am … Continue reading Pico Touch Board Audio →

Z80 and AY-3-8910

Finally starting to look at the Arduino and AY-3-8910 was triggered by a couple of things recently. First getting an RC2014 and playing with AY-3-8910 based sound on that. But also, having visiting RetroFest in Swindon this year, talking to Dean Belfield about the methods he used to develop for the ZX Spectrum and how … Continue reading Z80 and AY-3-8910 →