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Old 10th Jun 2021, 4:35 pm   #3
AndiiT
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Join Date: Aug 2005
Location: Saltburn-East, Cleveland, UK.
Posts: 1,735
Default Re: "Duck" telephone

Hi, it probably wouldn't hurt to change the electrolytic capacitors on the PCB and check the diodes which are connected across the incoming line (A and B legs) which are there to provide polarity reversal protection (they are basically a bridge rectifier with the A and B legs of the line connected to what would be the AC side of the bridge) one or more of these could have gone short circuit

Andrew
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