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#telephoneexchange

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Ok #vintageElectronics nerds! tell me about these things…

The “MR” designation denotes some kind of diode (it stands for Metal Rectifier, a notation hangover from before silicon/germanium diodes) and they’re obviously arranged as full bridge rectifiers

They’re in a PSU made for the British Post Office in 1972

The brown stripe seems to denote the + end, but what does the other stripe mean?

Welcome to the #TelephoneExchange shed my new beepyboopy friend!

This is a “GPO Modem 2B” - a #dialup #modem… phone line in, RS232 out at a whopping 300bps!

It’s all discrete components (no ICs here!) and beautifully built with all the diodes/resistors mounted on little plastic carriers.

The modulator, demodulator etc are on separate, pull-out cards

It’s a gorgeous chunk of engineering, that I’ll be carefully powering up over the next few weeks!

Thanks for the swap @anachrocomputer