Posts Tagged ‘telephone’:

2012-02-12 Hybrid 600 Ohm 1:1 Transformer

I blogged this a long time ago, but my old blog is gone, so here it is again.  I unsoldered a large number of these 600 ohm hybrid transformers from PBX boards.  Each transformer has four 600 ohm windings, and is used to interface to the PSTN (telephone central office).  Notice that there is a

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