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Homegrownmodem
From the MAKE: Flickr pool

Anachrocomputer shares with us this handmade piece of digital days gone by -

Top view of the 300 baud acoustically-coupled modem that I built in 1984. I made the double-sided PCB myself with an etch-resist pen (Dalo pen) and some rub-down transfers. The main chip is the Motorola MC14412V single-chip modem, but there are also some LM311 op-amps and LM324 quad op-amps. The board is normally installed inside my Compukit UK101.

That’s some well-kept shiny copper for a 25 year old board! Hmm, makes me wonder – what methods(if any) are people using to preserve their hand-etched circuits these days? – 300 baud modem, PCB

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!


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