Last Updated or created 2025-10-15
Lol, got an email from a PCB sponsor!
Deeply impressed by your blog content which means a lot to electronic enthusiasts.
I'd like to sponsor your project by providing free PCB prototyping,ROM SWITCHER
I made a rom switcher in the past.
Now I’m using an Arduino to switch Kernal and Character rom.
(Partly idea from Adrian)
Where the F* is my schematic
Above right picture:
- Tactile button (emulates restore key)
- Red led – reset
- Yellow led – Exrom
- Blue leds, Address lines select ROM part in 27512 EPROM
- Green leds, Address lines select ROM part Character ROM
Motorized Fader Potentiometer
I don’t trust some B&B’s so I made a camera detector.
(I always scan the wifi and Access Points)
This one lets you know if there are IR enabled camera’s.
(Night vision)
Picture 1:
- 1 = org camera module, IR filter is hard to remove. (See pink color)
- 2 = other module, IR filter is at bottom
- 3 = IR Filter, I removed this.
Picture 2:
IR light blast from a “hidden” camera. (I need to adjust focus of lens)