Improved Double-Sided Toner Switch Technique

In the period earlier than PCB retailers would make virtually any PCB conceivable, as nicely making many different manufacturing processes for prototypes out there to hobbyists, there have been a number of methods of constructing PCBs at residence. Many of which contain harsh chemical substances and had been simple to mess up. Getting a single-layer PCB utilizing the toner switch methodology, for instance, took a little bit of follow (and a fume hood) to get proper. [Bettina Neumryr] is engaged on a customized two-layer PCB, and has a new trick to get it to come out right regardless of the added complexity of the second layer.

The methodology begins out as a regular single-layer board in impact. Toner is ironed onto a copper board, on this case utilizing a laminator, which permits the board to enter an acid tub which washes away the entire un-tonered copper. But with the second layer uncovered, this could wash away the opposite facet of the board fully. [Bettina] is utilizing a brand new methodology right here to guard that layer throughout the first tub: protecting it in ink from a magic marker. With the primary board etched, the ink and toner get washed off and the second layer is fastidiously lined up, put by means of the laminator, after which the alternative facet will get lined in ink for the second acid tub.

After the method is full and plenty of layers of ink and toner are eliminated, [Bettina] is left with a PCB that’s able to obtain digital elements, if somewhat stained from all of the ink. As to what this particular board goes for use for, she’s saved {that a} bit cryptic because it’s the topic of a future video. Her builds usually revolve around designs from antique elecronics magazines, so it’s virtually definitely one thing of that nature, and that’s additionally why this particular design couldn’t be simply despatched off to a board store.