I introduced OzPLAR in my previous post. It’s an evolution of the telephone intercom design I had published in Silicon Chip magazine back in 1992. With my 2021 collaborator Ross we deliberately designed the circuit and PCB to accommodate a range of variations and alternate components so as to make it as flexible and globally-appealing …
My original telephone intercom project was published in Silicon Chip magazine here in Oz in May 1992. Photocopies of that original article are still available from Silicon Chip, and they kindly let me re-publish the circuit here. The intercom unit powered two telephones, allowing you to talk between them. Lifting one handset automatically started the …
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