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Old 10th Jun 2021, 2:46 pm   #1
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 5,394
Default "Duck" telephone

I have recently acquired the telephone shown below, which has a fault resulting in a very loud buzzing (attached as an MP3 in a ZIP file). As can be seen from an expanded waveform from Audacity (as used to record it) it is basically a triangular wave (with dial tone from my PABX superimposed, though at a much lower level than the buzz).

Microelectronics, as shown in the image of the duck's giblets, are not my forte, so any pointers as to what to check would be appreciated.
Attached Thumbnails
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Name:	duck phone.jpg
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ID:	235673   Click image for larger version

Name:	buzz waveform.PNG
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ID:	235675   Click image for larger version

Name:	duck giblets.jpg
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ID:	235676  
Attached Files
File Type: zip BUZZ.ZIP (151.3 KB, 15 views)
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