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  The CLM 50 KHz System of payphone Pulse metering - Circuit diagram & description

 

50 Hz Circuit 

After line reversal, the 50 Hz meter pulse is injected longitudinally on the line and an earth return path is required at the payphone.

 

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On how obsolete Australian landline payphones work 

on CLM 12 and CLM 50 metering

 

 

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