RS232 flow-control & handshaking – Psion MC400 retro communications

Connecting my retro-laptop to the internet via 2 x RS232 serial connections to a Raspberry Pi… and defeated (for now) by lack of hardware flow-control signals 😦

Tiny Oscilloscope kit based on STM32F103 ARM microcontroller

I discovered this tiny oscilloscope kit the other week. It’s a DSO138 by JYE Tech – £30 from Amazon(UK) or less than £20 if you can wait for delivery from China 🙂It took me less than 2 hours to build and worked first time! I’ve still got some soldering skills lol. It comes in twoContinue reading “Tiny Oscilloscope kit based on STM32F103 ARM microcontroller”

Replacing white LED stylus target light on Audio-Technica AT-LP120X

I recently bought a new turntable, the Audio-Technica AT-LP120XUSB. I wanted direct drive, decent mid-range quality (didn’t need the absolute highest spec due to my ageing & damaged hearing – I blame the school discos of the 1980s, and Roni Size gigs 😦 ) and USB built-in so I could hook up recording/streaming devices. IContinue reading “Replacing white LED stylus target light on Audio-Technica AT-LP120X”

Flashing LEDs with a 555 timer – and not a lot else

Just dug this out of storage – some electronics I made in the late 80s/early 90s. Most of it is old/scrap components – only the 555 and the MC14526 counter/divider actually do anything – flashing the LEDs long the edge. I can remember making it at work during quiet times as a side project, IContinue reading “Flashing LEDs with a 555 timer – and not a lot else”