Opto Isolator Board for Connecting old wireless system to Picaxe (also Old Apache Trick via CorelDraw)


Senior Member
Geez… too rainy to fish and too old to make love all day. May as well do a little project.

This little project is very simple but quite useful. Searching the forum for “opto isolator’ I see a lot of posts so I’m not going to go into a “how it works” dialog. For newbies to electronics: The opto isolator is useful for protecting microprocessors from high-voltage transients & is a simple way to connect Picaxe inputs/outputs to circuits that operate at higher/lower voltages. For example, If you have a Picaxe controller in your home & you want to run wires across your yard to another building or to outdoor field devices, it’s best to use opto isolators.

Since this board was used to connect Picaxe & other gadgets to old KeepSafer wireless transmitters, see attached .pdf page 3 to see how that was done. (Yes, I know I’m a pack rat, never throw away old tech)

I also included a bonus file that explains how to do circuit board fills in CorelDraw. Don’t know if any of y’all use CorelDraw, but it’s a wonderful tool for doing electronic and/or CNC projects. Only thing I don’t like is the price (the reason I don’t have the latest greatest version). I don’t know if the student version supports .ps/.pdf import/export. Anyone know?

Pretty much any PCB design app that can generate circuit-board artwork as PostScript (.ps .eps) or as a .pdf can be brought into CorelDraw & modified to your heart’s content.

For example, your buddy emails you a circuit-board .pdf done in DipTrace. You can then design an enclosure for the board in CorelDraw (the PCB is simply an object you can move around). Since CorelDraw supports multi-page drawings, an entire project (e.g. circuit schematic, PCB artwork, CNC work, software, etc.) can be saved as a single file.

Note: attached raw pcb file (kps_isol.pdf) in case anyone wants to try the Corel trick.

MCT6 Dual Opto: https://www.mouser.com/ds/2/149/MCT6-1011122.pdf